Cedar Elm Decline

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Nitrogen (N) is one of the most important essential nutrients for trees. It is considered a primary macronutrient, meaning trees require relatively large amounts of it for healthy growth. Nitrogen is a key component of chlorophyll—the green pigment that allows plants to capture sunlight and produce energy through photosynthesis.

In Texas, nitrogen deficiencies can occur in landscapes with poor soils, compacted ground, low organic matter, or where nutrients have been depleted over time. However, excessive nitrogen can also be harmful, promoting weak, overly vigorous growth that is more susceptible to insects and diseases.

Nitrogen plays a vital role in:

• Leaf and shoot development
• Chlorophyll production
• Photosynthesis
• Protein formation
• Root growth
• Overall tree vigor
• Healthy canopy development

Adequate nitrogen helps trees produce lush green foliage and strong annual growth.

Trees may become deficient due to:

• Low organic matter in the soil
• Sandy or nutrient-poor soils
• Heavy rainfall that leaches nutrients
• Soil compaction
• Root damage
• Competition from turfgrass or nearby plants
• Poor root health
• Insufficient fertilization in nutrient-depleted landscapes

A soil test is the best way to confirm a nitrogen deficiency.

Common symptoms include:

• Pale green or yellow leaves
• Older leaves turning yellow first
• Reduced annual growth
• Small leaves
• Thin or sparse canopy
• Early leaf drop
• Reduced flowering or fruit production
• Overall lack of vigor

Unlike iron deficiency, nitrogen deficiency usually affects older leaves before younger leaves, because nitrogen can move from older tissues to support new growth.

Nitrogen deficiency may occur in many Texas trees, including:

• Pecan
• Live Oak
• Cedar Elm
• Red Oak
• Maple
• Ash
• Magnolia
• Bald Cypress
• Fruit trees
• Newly planted trees

Young trees may show symptoms more quickly because they are actively growing.

Insufficient nitrogen can lead to:

• Reduced photosynthesis
• Slower growth
• Weak branch development
• Poor root growth
• Increased susceptibility to drought
• Greater vulnerability to insects and diseases
• Reduced overall tree health

Long-term deficiencies can significantly shorten a tree's vigor and productivity.

Yes. Management should begin with identifying the cause of the deficiency.

Recommended practices include:

• Conducting a soil test before fertilizing
• Applying nitrogen fertilizer only if needed and according to label recommendations
• Adding organic mulch to improve soil health
• Incorporating compost where appropriate
• Watering deeply during dry periods
• Reducing soil compaction to improve root function

Avoid applying excessive nitrogen, as too much fertilizer can stimulate rapid, weak growth and increase susceptibility to pests and storm damage.

• Test soil every few years to monitor nutrient levels.
• Maintain a 2–4 inch layer of organic mulch around the root zone, keeping mulch several inches away from the trunk.
• Leave fallen leaves to decompose naturally where practical, or use compost to return nutrients to the soil.
• Water trees during prolonged drought to maintain healthy root systems.
• Avoid damaging roots through construction or heavy equipment.
• Fertilize only when a nutrient deficiency has been confirmed.

Nitrogen deficiency often develops gradually, making the symptoms easy to overlook until growth has slowed significantly. Early identification allows homeowners to correct nutrient imbalances before long-term stress affects the tree's health.

In Texas, maintaining healthy soil through proper mulching, irrigation, and periodic soil testing is the best way to ensure trees receive adequate nitrogen. Healthy nitrogen levels support vigorous growth, deep green foliage, improved resistance to environmental stress, and long-term landscape health. 

Phosphorus (P) is one of the three primary macronutrients essential for healthy tree growth, along with nitrogen and potassium. It plays a critical role in root development, energy transfer, cell growth, and reproduction. Every tree requires phosphorus to establish a strong root system and support healthy leaves, flowers, fruits, and seeds.

In Texas, phosphorus deficiencies are less common than nitrogen or iron deficiencies because many soils naturally contain adequate phosphorus. However, in highly weathered, compacted, or poorly drained soils, phosphorus may become unavailable to tree roots.

Phosphorus is essential for:

• Strong root development
• Energy storage and transfer (ATP)
• Cell division and new tissue growth
• Flower and fruit production
• Seed development
• Early tree establishment
• Overall tree vigor

Healthy phosphorus levels help trees develop extensive root systems that improve water and nutrient uptake.

Trees may become deficient because of:

• Low-phosphorus soils
• Highly acidic or highly alkaline soils
• Soil compaction
• Poor drainage
• Cold or waterlogged soils
• Root damage from construction
• Limited organic matter
• Newly planted trees with undeveloped root systems

Often, phosphorus is present in the soil but is chemically unavailable for root uptake.

Common symptoms include:

• Slow or stunted growth
• Small, undersized leaves
• Dark green foliage
• Purplish or reddish leaf coloration on some species
• Weak shoot development
• Delayed leaf emergence
• Reduced flowering and fruit production
• Poor root growth
• Thin canopy

Symptoms usually develop gradually and may be difficult to distinguish from other nutrient deficiencies without a soil test.

Phosphorus deficiency may occur in:

• Pecan
• Live Oak
• Cedar Elm
• Red Oak
• Maple
• Magnolia
• Fruit trees
• Bald Cypress
• Newly planted landscape trees

Young trees are more likely to show symptoms because they need phosphorus to establish healthy root systems.

Insufficient phosphorus can:

• Limit root development
• Reduce water and nutrient absorption
• Slow overall growth
• Delay establishment of newly planted trees
• Reduce flowering and nut or fruit production
• Increase susceptibility to drought and environmental stress
• Lower overall tree vigor

Trees with poor root systems are less resilient during periods of heat and drought.

Yes, but treatment should begin with a soil test to confirm the deficiency.

Management practices may include:

• Applying phosphorus fertilizer only if recommended by a soil test
• Improving soil drainage and aeration
• Adding organic matter such as compost
• Protecting roots from compaction and construction damage
• Watering deeply during dry periods
• Maintaining a mulch layer over the root zone

Avoid applying phosphorus unnecessarily, as excess phosphorus can build up in the soil and contribute to water pollution through runoff.

• Test soil before applying fertilizer.
• Maintain a 2–4 inch layer of organic mulch around the tree, keeping mulch several inches away from the trunk.
• Improve compacted soils to encourage healthy root growth.
• Protect the root zone during construction.
• Water newly planted trees consistently during establishment.
• Fertilize only when a confirmed nutrient deficiency exists.

Phosphorus deficiency often develops slowly and may not become noticeable until root growth and overall vigor have already declined. Identifying the problem early allows corrective measures to be taken before long-term stress affects tree health.

In Texas, proper soil management, periodic soil testing, and maintaining healthy root systems are the best ways to ensure trees receive adequate phosphorus. Healthy phosphorus levels promote strong roots, vigorous growth, improved drought tolerance, and long-term landscape resilience. 

Potassium (K) is one of the three primary macronutrients essential for healthy tree growth, along with nitrogen (N) and phosphorus (P). Unlike nitrogen, potassium is not a structural part of plant tissues. Instead, it regulates many important processes that help trees stay healthy, resist stress, and use water efficiently.

In Texas, potassium deficiencies are less common than iron or nitrogen deficiencies but may occur in sandy soils, heavily weathered soils, or landscapes where nutrients have been depleted over time. Trees experiencing drought or poor soil conditions may also have difficulty absorbing enough potassium.

Potassium supports many vital functions, including:

• Water regulation within plant cells
• Strong root development
• Photosynthesis
• Enzyme activation
• Carbohydrate production and transport
• Disease resistance
• Drought tolerance
• Cold and heat stress tolerance
• Overall tree vigor

Adequate potassium helps trees remain resilient during periods of environmental stress.

Potassium deficiencies may result from:

• Sandy or nutrient-poor soils
• Heavy rainfall that leaches nutrients
• Long-term nutrient depletion
• Soil compaction
• Poor drainage
• Root damage
• Drought stress
• Competition from turfgrass or nearby plants

A soil test is the most reliable way to determine whether a potassium deficiency exists.

Common symptoms include:

• Yellowing along the edges of older leaves
• Brown or scorched leaf margins (leaf edge burn)
• Curling leaf edges
• Premature leaf drop
• Slow or reduced growth
• Weak branches
• Thin canopy
• Reduced flowering, fruit, or nut production
• Increased susceptibility to drought and disease

Because potassium is mobile within the tree, symptoms usually appear on older leaves first as the nutrient is moved to support new growth.

Potassium deficiency may occur in:

• Pecan
• Live Oak
• Cedar Elm
• Red Oak
• Maple
• Magnolia
• Bald Cypress
• Ash
• Fruit trees
• Newly planted landscape trees

Trees growing in poor or sandy soils are at greater risk.

Insufficient potassium can lead to:

• Reduced drought tolerance
• Poor water-use efficiency
• Weak branch and stem growth
• Increased susceptibility to insects and diseases
• Reduced photosynthesis
• Lower fruit and nut production
• Slower recovery from environmental stress
• Declining overall tree health

Potassium is especially important during periods of extreme heat and prolonged drought.

Yes. Management should begin with a soil test to confirm the deficiency.

Recommended practices include:

• Applying potassium fertilizer only if recommended by a soil test
• Improving soil structure with organic matter
• Reducing soil compaction
• Maintaining proper irrigation during dry weather
• Applying a 2–4 inch layer of organic mulch over the root zone
• Protecting roots from construction damage

Avoid applying excessive potassium, as too much can interfere with the uptake of other nutrients such as magnesium and calcium.

• Test soil before fertilizing.
• Maintain healthy soil with compost and organic mulch.
• Water trees deeply during extended dry periods.
• Avoid compacting soil over the root zone.
• Protect roots during landscaping and construction projects.
• Fertilize only when a nutrient deficiency has been confirmed.

Potassium deficiency often develops gradually, and symptoms may be mistaken for drought stress or leaf scorch. Identifying the problem early allows corrective measures to be taken before significant damage occurs.

In Texas, maintaining healthy soil, protecting tree roots, and using soil test results to guide fertilization are the best ways to ensure trees receive adequate potassium. Proper potassium levels help trees withstand drought, extreme heat, insects, diseases, and other environmental stresses while promoting strong, healthy growth for years to come. 

Iron (Fe) is an essential micronutrient that trees need in small amounts to remain healthy. Although only trace amounts are required, iron plays a critical role in chlorophyll production, photosynthesis, energy transfer, and overall plant growth. Without adequate iron, trees cannot produce enough chlorophyll, resulting in a condition known as iron chlorosis.

In Texas, iron deficiency is one of the most common nutrient problems, especially in areas with alkaline (high pH) soils such as Central and West Texas. In many cases, iron is present in the soil but becomes chemically unavailable for tree roots to absorb.

Iron is essential for:

• Chlorophyll production
• Photosynthesis
• Energy transfer within plant cells
• Healthy leaf development
• Enzyme function
• Overall tree growth and vigor

Unlike nitrogen, iron cannot be easily moved from older leaves to new growth, so deficiency symptoms usually appear on the newest leaves first.

Iron deficiency may result from:

• High soil pH (alkaline soils)
• Calcareous or limestone-based soils
• Poor soil drainage
• Soil compaction
• Root damage
• Overwatering
• Drought stress
• Excess phosphorus in the soil
• Poor root health

In Texas, high soil pH is the most common cause of iron chlorosis.

Common symptoms include:

• Bright yellow leaves with dark green veins (interveinal chlorosis)
• Symptoms first appearing on young or newly developed leaves
• Pale or almost white leaves during severe deficiencies
• Small leaves
• Slow or stunted growth
• Thin canopy
• Branch dieback in advanced cases
• Reduced flowering or fruit production

The distinct green veins surrounded by yellow leaf tissue are one of the easiest ways to recognize iron chlorosis.

Iron deficiency commonly affects:

• Live Oak
• Red Oak
• Pin Oak
• Maple
• Magnolia
• Sweetgum
• River Birch
• Pecan
• Redbud
• Fruit trees

Trees growing in alkaline soils are especially susceptible.

If left untreated, iron deficiency can:

• Reduce photosynthesis
• Slow growth
• Weaken root development
• Increase susceptibility to drought
• Make trees more vulnerable to insects and diseases
• Cause branch dieback
• Lead to long-term decline

Young and recently transplanted trees are particularly vulnerable because they have smaller root systems.

Yes. Management depends on identifying the underlying cause.

Recommended practices include:

• Conducting a soil test to determine soil pH and nutrient levels
• Applying chelated iron products when appropriate
• Improving soil drainage and aeration
• Reducing soil compaction
• Applying organic mulch around the root zone
• Watering deeply during dry periods
• Avoiding excessive phosphorus fertilization

In severe cases, trunk injections or soil-applied chelated iron treatments may be recommended for high-value trees by qualified professionals.

• Test soil before applying fertilizers or micronutrients.
• Maintain a 2–4 inch layer of organic mulch around the tree, keeping mulch several inches away from the trunk.
• Protect roots from construction damage and soil compaction.
• Improve drainage in poorly drained soils.
• Water deeply but avoid overwatering.
• Select tree species that are well adapted to local soil conditions.

Iron deficiency is easiest to correct when identified early. Recognizing the characteristic yellow leaves with green veins allows corrective measures to be taken before growth slows or branch dieback develops.

In Texas, proper soil management, periodic soil testing, and maintaining healthy root systems are the best strategies for preventing iron chlorosis. Healthy iron levels promote vigorous green foliage, efficient photosynthesis, improved resistance to environmental stress, and long-term tree health. 

Manganese (Mn) is an essential micronutrient that trees need in small amounts for healthy growth and development. Although required in much smaller quantities than nitrogen, phosphorus, or potassium, manganese plays a vital role in photosynthesis, enzyme activation, chlorophyll production, and nutrient metabolism.

In Texas, manganese deficiency is most commonly found in alkaline (high pH) soils, where the nutrient may be present but unavailable for uptake by tree roots. The symptoms can resemble iron deficiency, making proper diagnosis through soil or leaf tissue testing important.

Manganese is essential for:

• Photosynthesis
• Chlorophyll formation
• Enzyme activation
• Nitrogen metabolism
• Root development
• Healthy leaf growth
• Energy production
• Overall tree vigor

Adequate manganese helps trees efficiently convert sunlight into energy and maintain healthy green foliage.

Manganese deficiency may result from:

• High soil pH (alkaline soils)
• Limestone or calcareous soils
• Poor soil drainage
• Soil compaction
• Root damage
• Excessive phosphorus applications
• Drought stress
• Poor root health

In Texas, high-pH soils are the most common cause because manganese becomes chemically unavailable even when present in the soil.

Common symptoms include:

• Yellowing between leaf veins (interveinal chlorosis)
• Young leaves affected first
• Fine green veins remaining visible
• Small brown or gray specks developing between veins in severe cases
• Reduced leaf size
• Slow or stunted growth
• Thin canopy
• Reduced flowering or fruit production

Unlike iron deficiency, advanced manganese deficiency often produces small dead spots (necrotic speckling) within the yellow leaf tissue.

Manganese deficiency may occur in:

• Live Oak
• Red Oak
• Pecan
• Maple
• Magnolia
• Sweetgum
• Redbud
• Fruit trees
• Citrus
• Newly planted landscape trees

Trees growing in alkaline or poorly drained soils are more likely to develop symptoms.

If left untreated, manganese deficiency can:

• Reduce photosynthesis
• Slow tree growth
• Weaken new shoots
• Decrease drought tolerance
• Increase susceptibility to insects and diseases
• Reduce flowering and fruit production
• Lead to long-term decline

Young trees are especially vulnerable because they rely on healthy new growth to establish strong root systems and canopies.

Yes. Management should begin with a soil test or leaf tissue analysis to confirm the deficiency and identify contributing soil conditions.

Recommended management practices include:

• Applying manganese fertilizer only when recommended
• Using manganese sulfate or chelated manganese products when appropriate
• Improving soil drainage and aeration
• Reducing soil compaction
• Applying organic mulch over the root zone
• Watering deeply during dry periods
• Managing soil pH where practical

Avoid applying manganese without confirming a deficiency, as excessive applications may interfere with the uptake of other nutrients.

• Test soil before applying fertilizers or micronutrients.
• Maintain a 2–4 inch layer of organic mulch around the tree, keeping mulch several inches away from the trunk.
• Protect the root zone from heavy equipment and construction.
• Improve drainage in compacted or poorly drained soils.
• Water trees properly during prolonged drought.
• Select tree species that are well adapted to local soil conditions.

Manganese deficiency often develops gradually and can easily be mistaken for iron chlorosis. Early diagnosis through soil or tissue testing allows corrective measures to be taken before significant stress or canopy thinning occurs.

In Texas, maintaining healthy soil, minimizing root stress, and monitoring nutrient levels through periodic testing are the best ways to prevent manganese deficiency. Adequate manganese supports healthy green foliage, efficient photosynthesis, strong growth, and improved resistance to environmental stresses, helping trees remain vigorous and productive for many years. 

Zinc (Zn) is an essential micronutrient that trees require in small amounts for healthy growth and development. Although needed only in trace quantities, zinc is critical for enzyme activity, plant hormone production, protein synthesis, and normal leaf and shoot development.

In Texas, zinc deficiency is especially common in pecan trees and may also occur in other tree species growing in alkaline (high pH), calcareous, or sandy soils. Many Texas soils contain zinc, but high soil pH can make it unavailable for tree roots to absorb.

Zinc plays a vital role in:

• Enzyme activation
• Plant hormone (auxin) production
• Protein synthesis
• Chlorophyll formation
• Leaf expansion
• Shoot growth
• Root development
• Flower, fruit, and nut production
• Overall tree vigor

Adequate zinc helps trees produce healthy foliage, strong shoots, and normal annual growth.

Zinc deficiency may result from:

• High soil pH (alkaline soils)
• Limestone or calcareous soils
• Sandy soils with low organic matter
• Excess phosphorus fertilization
• Soil compaction
• Poor drainage
• Root damage
• Drought stress
• Poor root health

In Texas, high-pH soils are the most common reason zinc becomes unavailable to trees.

Common symptoms include:

• Small, narrow leaves
• Shortened spaces between leaves (short internodes)
• Rosette-like clusters of leaves at branch tips ("rosetting")
• Yellowing between leaf veins (interveinal chlorosis)
• Thin canopy
• Slow shoot growth
• Dead twigs in severe cases
• Reduced flowering, fruit, or nut production

On pecan trees, zinc deficiency often produces a condition called "little leaf," in which leaves are much smaller than normal and clustered together on shortened shoots.

Zinc deficiency is most often seen in:

• Pecan
• Citrus
• Peach
• Plum
• Apple
• Pear
• Maple
• Live Oak (occasionally)
• Newly planted fruit and ornamental trees

Pecan trees are particularly susceptible and frequently require zinc management in many Texas landscapes and orchards.

Insufficient zinc can lead to:

• Reduced photosynthesis
• Poor shoot and root development
• Delayed tree establishment
• Lower fruit and nut yields
• Reduced drought tolerance
• Increased susceptibility to insects and diseases
• Overall decline in tree vigor

Long-term deficiencies can significantly reduce productivity and ornamental value.

Yes. Management should begin with a soil test or leaf tissue analysis to confirm the deficiency.

Recommended practices include:

• Applying zinc fertilizers only when recommended
• Using zinc sulfate or chelated zinc products when appropriate
• Foliar zinc sprays for pecan trees during the growing season, if recommended
• Improving soil drainage and aeration
• Reducing soil compaction
• Applying organic mulch around the root zone
• Maintaining proper irrigation during dry periods

Avoid applying zinc without confirming a deficiency, as excessive zinc can interfere with the uptake of other essential nutrients.

• Test soil and leaf tissue before fertilizing.
• Maintain a 2–4 inch layer of organic mulch around the tree, keeping mulch several inches away from the trunk.
• Protect roots from construction damage and soil compaction.
• Avoid excessive phosphorus fertilization.
• Water trees deeply during prolonged drought.
• Select tree species and cultivars adapted to local soil conditions.

Zinc deficiency often develops gradually, and early symptoms may be mistaken for other nutrient problems. Identifying the deficiency early allows corrective treatments before growth slows or permanent damage occurs.

In Texas, routine soil testing, proper irrigation, healthy soil management, and timely zinc applications—particularly for pecan trees—are the most effective ways to prevent zinc deficiency. Maintaining adequate zinc levels promotes healthy leaf development, vigorous shoot growth, improved nut production, and greater resistance to environmental stress, helping trees remain healthy and productive for many years. 

Magnesium (Mg) is an essential secondary macronutrient that trees need for healthy growth and long-term vigor. Although trees require less magnesium than nitrogen, phosphorus, or potassium, it is vital because it forms the central atom of the chlorophyll molecule, allowing trees to capture sunlight and produce energy through photosynthesis.

In Texas, magnesium deficiencies are less common than iron or zinc deficiencies but may occur in sandy soils, acidic soils, heavily leached soils, or where excessive potassium or calcium interferes with magnesium uptake.

Magnesium is essential for:

• Chlorophyll production
• Photosynthesis
• Energy transfer within cells
• Enzyme activation
• Protein synthesis
• Carbohydrate production
• Healthy leaf development
• Overall tree growth and vigor

Adequate magnesium helps trees maintain deep green foliage and efficient energy production.

Magnesium deficiency may result from:

• Sandy or low-organic-matter soils
• Acidic soils
• Heavy rainfall that leaches nutrients
• Excessive potassium fertilization
• High calcium levels in the soil
• Soil compaction
• Poor drainage
• Root damage
• Drought stress

A soil test or leaf tissue analysis is the best way to determine if a tree is deficient in magnesium.

Common symptoms include:

• Yellowing between the veins of older leaves (interveinal chlorosis)
• Green veins surrounded by yellow tissue
• Brown or scorched leaf edges in advanced cases
• Premature leaf drop
• Reduced annual growth
• Thin or sparse canopy
• Weak shoot development
• Reduced flowering, fruit, or nut production

Because magnesium is a mobile nutrient, deficiency symptoms usually appear on older leaves first, as the tree moves magnesium to support new growth.

Magnesium deficiency may occur in:

• Pecan
• Live Oak
• Red Oak
• Maple
• Magnolia
• Citrus
• Peach
• Apple
• Pear
• Newly planted landscape trees

Fruit and nut trees are often more likely to show symptoms because of their high nutrient demands.

If left untreated, magnesium deficiency can:

• Reduce photosynthesis
• Slow tree growth
• Decrease drought tolerance
• Reduce fruit and nut production
• Increase susceptibility to insects and diseases
• Lower overall tree vigor
• Contribute to long-term tree decline

Healthy magnesium levels are especially important during periods of active growth and environmental stress.

Yes. Treatment should begin with confirming the deficiency through a soil or tissue test.

Management practices may include:

• Applying magnesium-containing fertilizers when recommended
• Using products such as magnesium sulfate (Epsom salt) or dolomitic limestone when appropriate for soil conditions
• Improving soil drainage and aeration
• Reducing soil compaction
• Applying organic mulch around the root zone
• Watering deeply during prolonged dry periods
• Maintaining balanced fertilization to avoid excessive potassium or calcium

Avoid applying magnesium without confirming a deficiency, as unnecessary applications can upset the balance of other nutrients.

• Test soil every few years to monitor nutrient levels.
• Maintain a 2–4 inch layer of organic mulch around the tree, keeping mulch several inches away from the trunk.
• Improve soil health with compost and other organic matter.
• Avoid excessive applications of potassium fertilizers.
• Water trees properly during drought.
• Protect the root zone from construction damage and heavy equipment.

Magnesium deficiency often develops gradually and may be mistaken for other nutrient disorders. Recognizing the characteristic yellowing between the veins of older leaves allows corrective measures to be taken before significant canopy thinning or growth reduction occurs.

In Texas, healthy soil management, regular soil testing, and balanced fertilization are the best ways to prevent magnesium deficiency. Adequate magnesium supports efficient photosynthesis, healthy green foliage, strong growth, improved stress tolerance, and long-term tree health, helping trees remain vigorous and resilient for many years. 

Calcium (Ca) is an essential secondary macronutrient that trees need for healthy growth, strong structure, and long-term vitality. Although required in smaller amounts than nitrogen, phosphorus, and potassium, calcium is critical for building strong cell walls, supporting root development, and maintaining healthy growing tissues.

In Texas, calcium deficiencies are relatively uncommon because many soils naturally contain calcium from limestone. However, deficiencies can occur in acidic, sandy, or heavily leached soils, or in situations where root damage or poor soil conditions limit calcium uptake.

Calcium is essential for:

• Strong cell wall formation
• Healthy root growth
• New shoot and leaf development
• Cell division
• Nutrient transport
• Stress tolerance
• Disease resistance
• Overall tree strength and vigor

Unlike some nutrients, calcium is not mobile within the tree, so deficiencies first appear in the newest leaves and growing points.

Calcium deficiency may result from:

• Acidic soils
• Sandy soils with low nutrient-holding capacity
• Heavy rainfall that leaches nutrients
• Poor soil drainage
• Soil compaction
• Root damage from construction
• Drought stress
• Excessive applications of potassium, magnesium, or ammonium fertilizers
• Poor root health

A soil test is the best way to determine if calcium levels are adequate.

Common symptoms include:

• Distorted or misshapen new leaves
• Young leaves with curled or cupped edges
• Dead or dying shoot tips
• Weak new growth
• Stunted root development
• Poor branch development
• Premature leaf drop
• Thin canopy
• Increased twig dieback in severe cases

Because calcium cannot move from older tissues to new growth, symptoms usually appear on the youngest leaves first.

Calcium deficiency may occur in:

• Pecan
• Maple
• Magnolia
• Fruit trees (apple, peach, pear, and plum)
• Citrus
• Redbud
• Newly planted landscape trees
• Nursery-grown trees
• Trees growing in acidic or sandy soils

Young, rapidly growing trees are often more susceptible because they have a greater demand for calcium.

Insufficient calcium can lead to:

• Weak cell walls
• Poor root development
• Reduced structural strength
• Slower growth
• Increased susceptibility to drought
• Greater vulnerability to insects and diseases
• Reduced flowering, fruit, or nut production
• Overall decline in tree vigor

Healthy calcium levels help trees develop strong tissues that are better able to withstand environmental stress.

Yes. Management should begin with confirming the deficiency through a soil test or leaf tissue analysis.

Recommended practices include:

• Applying calcium-containing soil amendments only when recommended
• Using agricultural lime to raise soil pH if appropriate
• Applying gypsum where calcium is needed without significantly changing soil pH
• Improving soil drainage and aeration
• Reducing soil compaction
• Applying organic mulch over the root zone
• Watering deeply during prolonged dry periods
• Protecting roots from construction damage

Avoid applying calcium unnecessarily, as excessive applications can interfere with the uptake of magnesium, potassium, and other nutrients.

• Test soil every few years to monitor nutrient levels and pH.
• Maintain a 2–4 inch layer of organic mulch around the tree, keeping mulch several inches away from the trunk.
• Improve soil health by incorporating organic matter when appropriate.
• Avoid excessive fertilization that can disrupt nutrient balance.
• Protect the root zone from heavy equipment and excavation.
• Water trees consistently during extended dry periods.

Calcium deficiency often affects new growth before other symptoms become obvious. Identifying distorted leaves, dying shoot tips, or poor root development early allows corrective measures to be taken before long-term damage occurs.

In Texas, maintaining healthy soil, protecting the root system, and using soil test results to guide fertilization are the best ways to ensure trees receive adequate calcium. Healthy calcium levels promote strong roots, sturdy branches, vigorous new growth, improved resistance to pests and diseases, and long-term tree health.

Bark Beetles are small wood-boring insects that live and reproduce beneath the bark of trees. While many species naturally help break down dead and dying trees, some bark beetles can become serious pests when they attack stressed, weakened, or drought-affected trees.

In Texas, bark beetles are most commonly associated with pine tree decline, especially during periods of drought, storm damage, or other environmental stress.

• Loblolly Pine
• Shortleaf Pine
• Slash Pine
• Longleaf Pine
• Ponderosa Pine
• Other conifer species

Bark beetles are typically:

• Very small (about 1/16 to 1/4 inch long)
• Brown, black, or reddish-brown
• Cylindrical in shape
• Difficult to see without close inspection

Most damage is caused by the larvae feeding beneath the bark.

Common indicators include:

• Small round holes in the bark
• Sawdust-like material on the trunk or ground
• Resin or pitch tubes on the bark
• Peeling or loose bark
• Yellowing needles
• Browning foliage
• Thinning canopy
• Woodpecker activity on the trunk

Trees often show symptoms from the top down as water movement becomes disrupted.

Adult beetles tunnel beneath the bark and lay eggs. The larvae then create feeding galleries that interrupt the flow of water and nutrients between the roots and canopy.

Heavy infestations can:

• Weaken trees
• Cause branch dieback
• Reduce growth
• Kill entire trees

Some bark beetles also introduce fungi that contribute to tree decline.

One of the most destructive forest pests in the southeastern United States.

Symptoms:

• Pitch tubes
• Rapid needle discoloration
• Tree mortality

Frequently attack drought-stressed or storm-damaged pines.

Symptoms:

• Reddish-brown needles
• Bark galleries
• Rapid decline

Often attacks the lower portion of pine trunks.

Symptoms:

• Large pitch tubes
• Reduced vigor
• Slow decline

Bark beetles are attracted to:

• Drought stress
• Storm damage
• Lightning strikes
• Construction injury
• Soil compaction
• Disease
• Recently cut or damaged trees

Healthy trees can often defend themselves by producing resin that pushes beetles out.

• Water trees during extended drought
• Avoid damaging roots and trunks
• Remove severely infested trees promptly
• Clean up storm debris
• Maintain proper mulch rings
• Monitor pines regularly for early signs of attack

Bark beetle infestations can spread quickly and may kill trees before symptoms become obvious. Identifying infestations early can help reduce losses and protect nearby trees from attack.

At CBM Tree Service, tree health assessments can help identify bark beetle activity, evaluate tree condition, and provide recommendations to help protect valuable trees throughout Texas. 

Wood-boring beetles are a diverse group of insects whose larvae tunnel into the wood of trees, logs, stumps, and lumber. While many species help recycle dead or dying wood, others can damage stressed trees or reduce the value of timber and wood products.

In Texas, most native wood-boring beetles are considered secondary pests, meaning they usually attack trees that are already weakened by drought, storm damage, disease, construction injury, or other environmental stress. Only a few invasive species are capable of attacking healthy trees.

Some of the most common groups include:

• Longhorned beetles (Cerambycidae)
• Flatheaded borers (Buprestidae)
• Bark beetles (Curculionidae: Scolytinae)
• Ambrosia beetles
• Metallic wood-boring beetles
• Powderpost beetles (primarily in seasoned wood)

Each group differs in appearance, host preference, and the type of damage it causes.

Adult females lay eggs on or beneath the bark.

After hatching, the larvae:

• Bore into the bark and wood
• Feed on inner bark, sapwood, or heartwood
• Create tunnels (galleries)
• Disrupt the movement of water and nutrients
• Weaken branches and trunks
• Reduce structural strength

The greatest damage is usually caused by the larval stage, not the adult beetles.

Common indicators include:

• Small round or oval exit holes in the bark
• Sawdust-like frass around the trunk or branches
• Tunnels beneath the bark
• Loose or peeling bark
• Sap or resin oozing from entry holes
• Branch dieback
• Yellowing or thinning foliage
• Increased woodpecker activity
• Dead or declining branches

Symptoms often become noticeable months or even years after infestation begins.

Wood-boring beetles may infest many tree species, including:

• Live Oak
• Red Oak
• Cedar Elm
• Pecan
• Pine
• Ash
• Cottonwood
• Willow
• Maple
• Bald Cypress

Newly planted, drought-stressed, storm-damaged, or diseased trees are at the greatest risk.

Heavy infestations can:

• Weaken tree structure
• Reduce water and nutrient transport
• Increase susceptibility to disease
• Cause branch dieback
• Lower timber and lumber value
• Lead to tree decline or death in severely stressed trees

Some invasive species, such as the Asian Longhorned Beetle, can kill otherwise healthy trees.

No. Many native species provide important ecological benefits by:

• Recycling dead and decaying wood
• Returning nutrients to the soil
• Creating habitat for birds and other wildlife
• Supporting healthy forest ecosystems

Their presence often indicates that a tree was already under stress rather than being the original cause of decline.

Yes. Management focuses on preventing tree stress and addressing infestations early. Recommended practices include:

• Maintaining proper watering during drought
• Applying mulch over the root zone
• Avoiding trunk and root injuries
• Promptly removing dead or severely infested trees
• Properly disposing of infested firewood
• Monitoring trees regularly for signs of infestation
• Using targeted insecticide treatments only when appropriate and recommended

Healthy trees are much more resistant to wood-boring beetles than stressed trees.

• Water deeply during extended dry periods.
• Protect trunks from lawn mower and string trimmer damage.
• Avoid soil compaction over the root zone.
• Prune damaged branches properly.
• Remove storm-damaged or dying wood promptly.
• Do not transport untreated firewood from infested areas.
• Inspect trees regularly for exit holes, frass, and canopy decline.

Wood-boring beetle infestations often begin long before obvious symptoms appear. Early detection allows property owners to improve tree health, reduce further stress, and prevent extensive structural damage.

In Texas, maintaining healthy trees through proper watering, mulching, pruning, and routine inspections is the best defense against most native wood-boring beetles. Healthy trees are better able to resist attack and continue providing shade, wildlife habitat, and long-term landscape value. 

Aphids are tiny, soft-bodied insects that feed on the sap of trees, shrubs, flowers, vegetables, and many ornamental plants. Although they are small, aphids can reproduce rapidly and form large colonies that weaken plants by removing water and nutrients.

In Texas, aphids are among the most common landscape pests, especially during the spring and early summer. Fortunately, they are also an important food source for beneficial insects such as lady beetles, lacewings, and hoverflies, which naturally help keep aphid populations under control.

Aphids commonly infest:

• Live Oak
• Pecan
• Crape Myrtle
• Maple
• Elm
• Ash
• Cottonwood
• Willow
• Fruit trees
• Roses and many ornamental plants

Different aphid species prefer different host plants.

Adult aphids are typically:

• About 1/16 to 1/8 inch long
• Pear-shaped with soft bodies
• Green, black, yellow, brown, red, or pink
• Found in clusters on leaves, stems, and new growth

Some aphids have wings and can fly to new host plants, while others remain wingless.

Aphids feed by inserting needle-like mouthparts into plant tissues and sucking out sap.

Heavy infestations can:

• Reduce plant vigor
• Distort new leaves and shoots
• Slow growth
• Cause leaf curling
• Reduce flowering and fruit production
• Stress young or newly planted trees

Most healthy, established trees can tolerate light infestations.

Common indicators include:

• Clusters of tiny insects on leaves or stems
• Curled or distorted leaves
• Sticky honeydew coating leaves, branches, or objects beneath the tree
• Black, sooty mold growing on honeydew
• Yellowing foliage
• Stunted new growth
• Increased activity of ants, which feed on honeydew and often protect aphids from predators

Honeydew is one of the easiest signs of an aphid infestation to recognize.

Large aphid populations can:

• Reduce photosynthesis
• Weaken plant growth
• Encourage sooty mold development
• Attract ants
• Stress young trees
• Reduce the appearance of ornamental plants

They rarely kill healthy, mature trees but can contribute to decline when combined with drought or other stress factors.

Many beneficial insects help control aphids naturally, including:

• Lady beetles (ladybugs)
• Green lacewings
• Hoverfly larvae
• Parasitic wasps
• Minute pirate bugs

Encouraging these beneficial insects often reduces the need for insecticides.

Yes. Management depends on the severity of the infestation and the health of the tree.

Effective practices include:

• Washing aphids off with a strong stream of water
• Pruning heavily infested shoots when practical
• Encouraging beneficial insects
• Avoiding excessive nitrogen fertilization, which promotes tender new growth
• Applying insecticidal soap or horticultural oil when appropriate
• Monitoring trees regularly during the growing season

Broad-spectrum insecticides should be used carefully because they may also kill beneficial insects that naturally control aphids.

• Inspect new growth regularly during spring and early summer.
• Maintain proper watering during dry periods.
• Apply mulch to help reduce tree stress.
• Encourage pollinators and beneficial insects by planting a diversity of flowering plants.
• Avoid unnecessary pesticide applications.
• Keep trees healthy through proper pruning and soil care.

Aphid populations can increase very quickly, but they are often easiest to control when detected early. Regular inspections of leaves and new growth can help identify infestations before they become severe.

In Texas, aphids are a common but usually manageable pest. Maintaining healthy trees and encouraging natural predators are the most effective long-term strategies for reducing aphid damage and supporting a balanced landscape ecosystem. 

Scale insects are small sap-feeding insects that attach themselves to the stems, branches, twigs, and leaves of trees and shrubs. Protected by a waxy or hard shell-like covering, they are often mistaken for bumps or growths on the bark rather than insects.

In Texas, scale insects are among the most common landscape pests. While light infestations usually cause little harm, heavy populations can weaken trees by removing water and nutrients, making them more vulnerable to drought, disease, and other stresses.

Scale insects commonly infest:

• Live Oak
• Pecan
• Magnolia
• Crape Myrtle
• Maple
• Elm
• Holly
• Citrus
• Wax Myrtle
• Many ornamental shrubs

Different species of scale insects specialize on different host plants.

Adult scale insects are typically:

• Very small (about 1/16 to 1/4 inch)
• Round, oval, or elongated
• Brown, gray, white, black, or tan
• Covered with a waxy or hard protective shell
• Immobile once attached to the plant

Because they remain attached to the plant, they are often overlooked until populations become large.

Soft Scales

• Produce sticky honeydew
• Often found on twigs and leaves
• Encourage the growth of sooty mold

Armored Scales

• Protected by a hard, waxy covering
• Do not produce honeydew
• Feed beneath their protective shell
• Often more difficult to control

Scale insects feed by inserting needle-like mouthparts into plant tissues and extracting sap.

Heavy infestations can:

• Reduce tree vigor
• Slow growth
• Cause yellowing leaves
• Trigger premature leaf drop
• Lead to twig and branch dieback
• Weaken young or stressed trees

Large infestations may develop gradually over several growing seasons.

Common indicators include:

• Small bumps attached to bark, leaves, or twigs
• Sticky honeydew on leaves, vehicles, or outdoor furniture (soft scales)
• Black sooty mold growing on honeydew
• Yellowing foliage
• Reduced leaf size
• Thinning canopy
• Branch dieback
• Increased ant activity, as ants feed on honeydew and protect scale insects from predators

Heavy infestations can:

• Reduce photosynthesis
• Weaken tree health
• Increase susceptibility to drought
• Slow overall growth
• Cause cosmetic damage from sooty mold
• Contribute to long-term tree decline

Young trees and trees already under stress are most likely to suffer serious damage.

Many beneficial insects help control scale populations naturally, including:

• Lady beetles (ladybugs)
• Green lacewings
• Parasitic wasps
• Predatory beetles
• Minute pirate bugs

Protecting these beneficial insects can significantly reduce scale infestations.

Yes. Effective management depends on identifying the type of scale insect and treating it during the appropriate stage of its life cycle.

Recommended practices include:

• Inspecting trees regularly for early infestations
• Pruning heavily infested branches when practical
• Encouraging beneficial insects
• Applying horticultural oil during the dormant season when appropriate
• Using insecticidal soap against young crawler stages when effective
• Maintaining proper watering and mulching to reduce tree stress

The crawler stage—when newly hatched scale insects are moving before developing their protective covering—is the most effective time for treatment.

• Monitor twigs and branches throughout the growing season.
• Water trees deeply during drought.
• Avoid excessive nitrogen fertilization, which can promote tender new growth.
• Apply mulch to conserve soil moisture and reduce stress.
• Encourage beneficial insects by minimizing unnecessary pesticide use.
• Keep trees healthy through proper pruning and soil care.

Scale insects are often difficult to notice until populations become well established. Early detection during the crawler stage allows for more effective management and helps prevent significant stress or long-term decline.

In Texas, healthy trees are naturally more resistant to scale insects. Regular inspections, proper watering, and supporting beneficial insects are the best long-term strategies for managing scale infestations and maintaining vigorous, resilient landscapes. 

Spider mites are tiny arachnids—more closely related to spiders and ticks than to insects—that feed on the sap of trees, shrubs, flowers, and many ornamental plants. Although they are barely visible to the naked eye, large populations can cause significant damage by piercing plant cells and extracting their contents.

In Texas, spider mites are especially common during hot, dry weather, making them a frequent problem during the summer months. Drought-stressed trees are particularly susceptible to severe infestations.

Spider mites commonly infest:

• Live Oak
• Cedar Elm
• Red Oak
• Maple
• Ash
• Magnolia
• Crape Myrtle
• Juniper (Cedar)
• Spruce
• Many ornamental shrubs and garden plants

Different spider mite species prefer different host plants.

Adult spider mites are typically:

• Less than 1/50 inch long
• Oval-shaped
• Green, yellow, red, brown, or orange depending on the species
• Eight-legged (unlike insects, which have six legs)

Because of their tiny size, they are often detected by the damage they cause rather than by seeing the mites themselves.

Spider mites feed by piercing individual plant cells and sucking out their contents.

Heavy infestations can:

• Reduce photosynthesis
• Cause leaf discoloration
• Slow tree growth
• Increase drought stress
• Lead to premature leaf drop
• Weaken young or stressed trees

Damage often becomes more severe during prolonged periods of heat and low humidity.

Common indicators include:

• Tiny yellow or white speckles (stippling) on leaves
• Bronze, gray, or faded foliage
• Fine silk webbing on leaves and twigs
• Premature leaf drop
• Dull or dusty-looking leaves
• Thinning canopy during severe infestations
• Tiny moving mites visible with a hand lens

Fine webbing is one of the most recognizable signs of heavy spider mite activity.

Large infestations can:

• Reduce tree vigor
• Increase susceptibility to drought
• Slow growth
• Damage ornamental appearance
• Cause premature leaf loss
• Contribute to long-term decline in stressed trees

Healthy, well-watered trees are generally better able to tolerate spider mite feeding.

Many beneficial organisms help control spider mite populations naturally, including:

• Predatory mites
• Lady beetles (ladybugs)
• Green lacewings
• Minute pirate bugs
• Six-spotted thrips

These natural enemies often keep spider mite populations below damaging levels when broad-spectrum insecticides are avoided.

Yes. Effective management includes:

• Inspecting leaves regularly during hot, dry weather
• Washing foliage with a strong stream of water to remove mites and webbing
• Maintaining proper irrigation during drought
• Encouraging beneficial predators
• Applying horticultural oil or insecticidal soap when appropriate
• Using miticides only when necessary and according to label directions

Because spider mites are arachnids, many general insecticides are ineffective and may actually worsen infestations by eliminating beneficial predators.

• Water trees deeply during prolonged dry periods.
• Reduce dust around susceptible plants when possible.
• Maintain a 2–4 inch layer of mulch over the root zone.
• Avoid unnecessary broad-spectrum insecticide applications.
• Monitor the undersides of leaves for early signs of mites.
• Encourage beneficial insects and predatory mites by maintaining a diverse landscape.

Spider mite populations can increase rapidly during hot, dry conditions. Detecting infestations early allows for simple management measures before extensive foliage damage occurs.

In Texas, routine inspections during the summer are one of the best ways to protect trees from spider mite damage. Healthy trees with adequate water and minimal stress are far less likely to suffer severe infestations and are better able to recover if mites are present. 

Leaf miners are the larvae of several types of insects—including certain moths, flies, beetles, and sawflies—that live and feed inside leaves. As they tunnel between the upper and lower surfaces of a leaf, they create distinctive winding or blotchy trails known as leaf mines.

In Texas, leaf miners are common on many ornamental trees, shrubs, vegetables, and landscape plants. While they can make leaves look unsightly, healthy, established trees usually tolerate light infestations with little long-term damage.

Leaf miners commonly infest:

• Live Oak
• Holly
• Redbud
• Elm
• Birch
• Cottonwood
• Citrus
• Boxwood
• Spinach and other leafy vegetables
• Many ornamental shrubs and flowering plants

Different leaf miner species specialize on different host plants.

The adult insects vary by species, but the damaging stage is the larva.

Leaf miner larvae are typically:

• Tiny and cream-colored or pale yellow
• Legless or worm-like
• Hidden inside leaves
• Difficult to see without opening the leaf

Adults are usually small flies, moths, beetles, or sawflies that lay eggs on or inside leaves.

After hatching, the larvae tunnel through the leaf tissue while feeding.

Their feeding can:

• Destroy leaf cells
• Reduce photosynthesis
• Cause leaves to discolor
• Lead to premature leaf drop during heavy infestations
• Reduce the ornamental appearance of plants

Because the larvae remain inside the leaf, they are protected from many natural enemies and contact insecticides.

Common indicators include:

• White, tan, or translucent winding trails inside leaves
• Large blotchy patches on leaves
• Brown or dead areas within leaf tissue
• Curled or distorted leaves
• Premature leaf drop
• Reduced vigor during severe infestations
• Small larvae visible inside mined leaves

The distinctive tunnels are often the easiest way to identify a leaf miner infestation.

Heavy or repeated infestations can:

• Reduce photosynthesis
• Weaken young trees and shrubs
• Slow plant growth
• Reduce the ornamental value of landscape plants
• Increase stress during drought or extreme heat

Healthy, mature trees generally recover well from minor infestations.

Many beneficial insects help control leaf miner populations, including:

• Parasitic wasps
• Lady beetles (ladybugs)
• Green lacewings
• Predatory bugs
• Spiders

These natural enemies often keep leaf miner populations below damaging levels.

Yes. Management depends on the severity of the infestation and the type of plant affected.

Recommended practices include:

• Removing and disposing of heavily infested leaves when practical
• Encouraging beneficial insects
• Watering trees during drought to reduce stress
• Avoiding unnecessary broad-spectrum insecticides
• Monitoring plants regularly during the growing season
• Applying targeted systemic insecticides only when warranted and according to label directions

Because larvae are protected inside the leaf, preventive or systemic treatments are generally more effective than contact sprays.

• Inspect new leaves regularly during spring and summer.
• Keep trees healthy with proper watering and mulching.
• Avoid excessive nitrogen fertilization that promotes tender new growth.
• Encourage beneficial insects by planting a diversity of flowering plants.
• Remove heavily infested leaves before larvae mature and emerge.
• Monitor susceptible plants throughout the growing season.

Leaf miner damage is often first noticed as small winding trails that expand as the larvae grow. Identifying infestations early allows homeowners to remove affected leaves and reduce future generations before populations increase.

In Texas, leaf miners are usually considered a cosmetic pest rather than a serious threat to healthy trees. Maintaining vigorous trees through proper watering, soil care, and support for beneficial insects is the most effective long-term strategy for minimizing leaf miner damage and preserving healthy landscapes. 

Caterpillars are the larval stage of moths and butterflies and are among the most common insects found on trees and shrubs throughout Texas. While many caterpillars are harmless and eventually develop into important pollinators, some species can feed heavily on leaves and cause noticeable defoliation.

Most healthy, mature trees can tolerate occasional caterpillar feeding, but repeated or severe infestations may weaken trees, especially when combined with drought, disease, or other environmental stresses.

Caterpillars commonly feed on:

• Live Oak
• Red Oak
• Pecan
• Cedar Elm
• Ash
• Maple
• Willow
• Cottonwood
• Fruit trees
• Many ornamental shrubs

Different caterpillar species prefer different host plants.

Caterpillars vary widely in appearance but are typically:

• Soft-bodied and segmented
• Green, brown, black, yellow, or brightly colored
• Covered with smooth skin, hairs, or spines, depending on the species
• Equipped with three pairs of true legs and several pairs of fleshy prolegs
• Ranging from less than ¼ inch to over 3 inches long

Some hairy caterpillars, such as the Puss Caterpillar, can deliver painful stings and should never be handled.

Caterpillars feed by chewing leaves, buds, flowers, and occasionally young fruit.

Heavy infestations can:

• Remove large amounts of foliage
• Reduce photosynthesis
• Slow tree growth
• Stress young or newly planted trees
• Cause premature leaf drop
• Weaken trees already affected by drought or disease

Most established trees produce a new flush of leaves after moderate feeding.

Common indicators include:

• Chewed or missing leaves
• Skeletonized foliage
• Ragged leaf edges
• Rolled or tied leaves
• Silk webbing or nests in branches
• Caterpillar droppings (frass) beneath the tree
• Visible caterpillars on leaves or branches
• Partial or complete defoliation during severe outbreaks

Different species create different feeding patterns, making identification easier.

Some frequently encountered species include:

• Fall Webworm
• Forest Tent Caterpillar
• Bagworm
• Walnut Caterpillar
• Puss Caterpillar
• Io Moth Caterpillar

Some species are beneficial as future pollinators, while others can become significant landscape pests.

Large or repeated infestations can:

• Reduce tree vigor
• Slow annual growth
• Increase drought stress
• Damage ornamental appearance
• Reduce fruit production
• Make trees more vulnerable to insects and diseases

Young and recently planted trees are most likely to suffer lasting damage.

Many wildlife species help control caterpillar populations naturally, including:

• Songbirds
• Parasitic wasps
• Predatory beetles
• Green lacewings
• Spiders
• Assassin bugs

Encouraging these natural predators often helps keep caterpillar populations in balance.

Yes. Management depends on the species and the severity of the infestation.

Effective practices include:

• Hand-removing caterpillars or egg masses when practical
• Pruning small webbed nests before they expand
• Encouraging birds and beneficial insects
• Maintaining proper watering and mulching to reduce tree stress
• Applying biological insecticides containing Bacillus thuringiensis (Bt) to susceptible young caterpillars when appropriate
• Using insecticides only when infestations threaten tree health

Early treatment is generally more effective because young caterpillars are easier to control than mature larvae.

• Inspect trees regularly during spring and summer.
• Remove webbed nests while they are small.
• Encourage birds and beneficial insects in the landscape.
• Keep trees healthy with proper watering and mulching.
• Avoid unnecessary broad-spectrum insecticides that may harm beneficial species.
• Wear gloves when handling unfamiliar caterpillars, as some species have irritating hairs or venomous spines.

Most caterpillar infestations begin with only a few larvae but can expand rapidly as they grow. Detecting feeding damage early allows for timely management before significant defoliation occurs.

In Texas, most healthy trees recover well from occasional caterpillar feeding. Maintaining vigorous trees through proper watering, soil care, and regular monitoring is the best long-term strategy for minimizing damage while supporting the beneficial role that many caterpillars play in the life cycle of butterflies and moths. 

Bagworms are the larval stage of several species of moths, most commonly the Common Bagworm. These insects are well known for constructing protective, spindle-shaped bags made from silk and pieces of leaves, needles, and twigs from the plants on which they feed.

In Texas, bagworms are common landscape pests that primarily attack evergreen trees and shrubs, although they may also feed on some deciduous trees. Heavy infestations can cause severe defoliation and may kill small or weakened plants if left unmanaged.

Bagworms commonly infest:

• Eastern Redcedar
• Ashe Juniper (Texas Cedar)
• Arborvitae
• Cypress
• Pine
• Spruce
• Juniper
• Leyland Cypress
• Live Oak (occasionally)
• Many ornamental shrubs

Evergreens are generally more vulnerable because they cannot quickly replace lost foliage.

Bagworm larvae are:

• Brown to black with mottled markings
• About 1 inch long when mature
• Hidden inside a protective bag they carry wherever they move

The bag is typically:

• 1–2 inches long
• Covered with bits of foliage, needles, and twigs
• Brown or gray, blending into the host plant

Adult males emerge as small, dark moths with clear wings, while adult females remain wingless and never leave their bags.

Bagworms feed by chewing leaves and needles while extending only their heads and legs from the protective bag.

Heavy infestations can:

• Strip foliage from branches
• Reduce photosynthesis
• Slow tree growth
• Cause branch dieback
• Weaken trees during drought
• Kill young or heavily infested evergreens

Damage usually begins near the top of the tree and progresses downward.

Common indicators include:

• Hanging spindle-shaped bags attached to branches
• Chewed or missing needles and leaves
• Browning foliage
• Thinning canopy
• Defoliated branches
• Slow or stunted growth
• Dead branch tips during severe infestations

The bags often remain attached to the tree through winter, even after the insects have completed their life cycle.

Bagworms typically complete one generation each year.

Their life cycle includes:

• Eggs overwinter inside the female's bag.
• Larvae hatch in late spring.
• Young larvae begin feeding and build their protective bags.
• Bags enlarge as the larvae grow.
• Mature larvae pupate inside the bag.
• Adult males emerge to mate, while females remain inside the bag to lay hundreds of eggs before dying.

Because eggs remain protected inside the bag, removing bags before they hatch can greatly reduce future infestations.

Severe infestations can:

• Defoliate evergreen trees and shrubs
• Reduce plant vigor
• Increase susceptibility to drought and disease
• Damage ornamental appearance
• Kill young trees or shrubs after repeated defoliation

Deciduous trees usually recover more easily than evergreens after feeding damage.

Several natural enemies help control bagworms, including:

• Songbirds
• Parasitic wasps
• Predatory insects
• Spiders

These beneficial organisms help reduce bagworm populations naturally but may not prevent outbreaks.

Yes. Bagworms are easiest to control when detected early.

Effective management practices include:

• Hand-picking and destroying bags during fall, winter, or early spring before eggs hatch
• Inspecting susceptible plants regularly
• Encouraging beneficial insects and birds
• Applying biological insecticides containing Bacillus thuringiensis (Bt) to young larvae
• Using labeled insecticides when infestations are severe and larvae are still small

Once larvae mature and their bags become larger, chemical treatments are generally much less effective.

• Inspect evergreen trees and shrubs several times each year.
• Remove overwintering bags by hand before spring.
• Maintain proper watering during drought to reduce plant stress.
• Encourage birds and beneficial insects in the landscape.
• Avoid unnecessary broad-spectrum insecticides that may harm natural predators.
• Monitor newly planted evergreens closely, as they are especially susceptible.

Bagworms are much easier to control when larvae are small. Once the protective bags become large, the insects are shielded from many treatments, making management more difficult.

In Texas, regular inspections of evergreen trees and shrubs can help detect bagworms before significant damage occurs. Early removal of bags, proper plant care, and preserving natural predators are the most effective long-term strategies for protecting landscapes from bagworm infestations.

The Elm Leaf Beetle is one of the most common insect pests of elm trees. Both the adults and larvae feed on elm leaves, often causing extensive defoliation when populations are high. While a single infestation rarely kills a healthy tree, repeated attacks over several years can weaken elms, making them more susceptible to drought, diseases, and other insect pests.

Originally introduced from Europe, the Elm Leaf Beetle is now found throughout much of the United States, including Texas.

Elm Leaf Beetles primarily attack:

• American Elm
• Cedar Elm
• Siberian Elm
• English Elm
• Chinese (Lacebark) Elm (less susceptible)
• Other elm species

Some elm species are more resistant than others.

Adults:

• About ¼ inch (6–7 mm) long
• Yellow to olive green
• Dark stripe along each wing cover
• Black markings behind the head
• Oval-shaped body

Larvae:

• Dark brown to black
• About ½ inch long when mature
• Soft-bodied and worm-like
• Black heads with yellowish sides

Both life stages feed on foliage:

• Adults chew small holes completely through the leaves.
• Larvae feed on the underside of leaves, leaving only the upper surface intact, creating a "skeletonized" appearance.

Heavy infestations can:

• Reduce photosynthesis
• Cause premature leaf drop
• Slow tree growth
• Weaken trees during drought
• Increase susceptibility to other pests and diseases

Common indicators include:

• Skeletonized leaves
• Small holes in foliage
• Brown or scorched-looking leaves
• Premature defoliation
• Clusters of yellow eggs on leaf undersides
• Dark larvae feeding beneath leaves
• Adult beetles visible on foliage
• Accumulations of larvae around the base of the trunk before pupation

Repeated annual defoliation is often the most noticeable sign of a serious infestation.

Elm Leaf Beetles usually complete two to three generations per year in Texas.

Their life cycle includes:

1. Adults overwinter in protected locations such as bark crevices, buildings, or leaf litter.
2. Females lay clusters of yellow eggs on the undersides of leaves in spring.
3. Larvae hatch and feed for several weeks.
4. Mature larvae crawl down the trunk to pupate near the base of the tree.
5. New adults emerge and begin feeding, starting another generation.

Repeated infestations can:

• Defoliate elm trees
• Reduce annual growth
• Increase drought stress
• Lower tree vigor
• Reduce the ornamental value of landscape trees
• Contribute to long-term decline when combined with other stress factors

Healthy mature trees usually survive occasional defoliation, but repeated attacks can significantly weaken them.

Several beneficial organisms help reduce Elm Leaf Beetle populations, including:

• Lady beetles
• Green lacewings
• Predatory stink bugs
• Spiders
• Parasitic wasps
• Songbirds

These natural enemies often help keep beetle populations below damaging levels.

Yes. An integrated approach is the most effective.

Recommended management practices include:

• Inspect elm trees regularly during spring and summer.
• Encourage beneficial insects.
• Remove heavily infested leaves when practical.
• Maintain proper watering during drought.
• Apply horticultural or biological treatments when larvae are young, if needed.
• Use labeled insecticides only when infestations threaten tree health and according to label directions.

Treatments are generally most effective against young larvae before widespread defoliation occurs.

• Keep elm trees healthy with proper watering and mulching.
• Avoid unnecessary stress from soil compaction or root damage.
• Inspect leaves for eggs and young larvae each spring.
• Encourage birds and beneficial insects by maintaining a diverse landscape.
• Remove fallen leaves in autumn to reduce overwintering sites.
• Monitor trees annually, especially after previous infestations.

Elm Leaf Beetle populations can increase rapidly during the growing season. Detecting eggs or young larvae early allows for more effective management before significant leaf damage occurs.

In Texas, healthy elm trees are generally able to withstand occasional feeding, but repeated defoliation can weaken trees over time. Regular monitoring, proper tree care, and conserving natural predators are the best long-term strategies for protecting elm trees from Elm Leaf Beetle damage. 

The Fall Webworm is a native North American moth whose caterpillars feed on the leaves of many hardwood trees. These caterpillars are well known for building large, silky webs around the ends of branches, where they live and feed together. Although the webs can be unsightly, Fall Webworms rarely cause serious harm to healthy, established trees.

In Texas, Fall Webworms are common from late spring through fall, with the largest and most noticeable webs typically appearing in late summer and early autumn.

Fall Webworms feed on more than 100 species of trees, including:

• Pecan
• Persimmon
• Walnut
• Hickory
• Elm
• Cottonwood
• Mulberry
• Sweetgum
• Willow
• Ash

They occasionally feed on ornamental landscape trees as well.

Caterpillars:

• About 1 inch (2.5 cm) long when mature
• Pale yellow to greenish with rows of black spots
• Covered with long white hairs
• Live together inside large silk webs

Adult Moths:

• Bright white, sometimes with small black spots
• Wingspan of about 1 to 1½ inches
• Active primarily at night

Young caterpillars feed together within the protective web, chewing leaves enclosed inside it.

Heavy infestations may:

• Remove leaves from branch tips
• Reduce photosynthesis
• Cause temporary defoliation
• Slow growth of young trees
• Reduce the ornamental appearance of trees

Healthy, mature trees usually produce new foliage and recover without long-term damage.

Common indicators include:

• Large white silk webs at the ends of branches
• Caterpillars feeding inside the webs
• Skeletonized or chewed leaves within the web
• Brown or dead leaves trapped inside the web
• Defoliated branch tips
• Webs becoming larger as caterpillars grow

Unlike tent caterpillars, Fall Webworms build their webs around the foliage they are actively feeding on.

In Texas, Fall Webworms typically produce two to four generations per year, depending on the region and weather.

Their life cycle includes:

1. Adult moths lay egg masses on the undersides of leaves.
2. Eggs hatch into small caterpillars.
3. Caterpillars spin protective silk webs and feed together.
4. Mature caterpillars leave the tree and pupate in leaf litter or soil.
5. Adult moths emerge and begin the next generation.

Heavy infestations can:

• Defoliate branch tips
• Reduce tree vigor in young trees
• Decrease the ornamental value of landscape trees
• Cause concern for homeowners because of their large, conspicuous webs

Despite their appearance, Fall Webworms seldom kill healthy trees.

Many natural enemies help keep webworm populations under control, including:

• Songbirds
• Parasitic wasps
• Predatory stink bugs
• Assassin bugs
• Ground beetles
• Spiders

These beneficial predators often reduce webworm populations without the need for chemical treatments.

Yes. Most infestations require little or no treatment.

Recommended management practices include:

• Pruning out small webs when practical
• Breaking open webs with a pole to expose caterpillars to predators
• Hand-removing webs from small trees
• Encouraging birds and beneficial insects
• Applying Bacillus thuringiensis (Bt) to young caterpillars when necessary
• Using insecticides only for severe infestations on young or high-value trees

Avoid burning webs with a torch, as this can seriously damage the tree.

• Inspect trees regularly from late spring through fall.
• Remove small webs before they become large.
• Maintain healthy trees through proper watering and mulching.
• Encourage beneficial insects and birds by planting native flowering plants.
• Avoid unnecessary broad-spectrum insecticides that may harm natural predators.
• Monitor susceptible trees after previous infestations.

Fall Webworm webs expand rapidly as caterpillars grow. Detecting and removing small webs early makes management easier and reduces defoliation.

In Texas, Fall Webworms are considered primarily an aesthetic pest rather than a serious threat to healthy trees. Proper tree care, early monitoring, and conserving natural predators are the most effective long-term strategies for minimizing webworm damage while maintaining healthy, resilient landscapes.