Insect & Disease
Resource Center

Signs of pests and diseases will vary from tree to tree. Search our database of pests and diseases for symptoms, damages, life cycle, management, and control information.

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Damage & Symptoms
Pest And Disease Center Bronze Birch Borer Banner 1440X500
Trunk or Bark Damage
Bronze Birch Borer
The bronze birch borer (Agrilus anxius) is a destructive beetle that feeds on birch trees. Signs of this pest include off-color and sparse foliage in the upper canopy of the birch tree, dead branches in the upper crown and swollen ridges on the trunk and branches.
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Pest And Disease Center Leaf Spot And Melting Out Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Leaf Spot & Melting-Out
Leaf spot and melting-out are turfgrass fungal diseases that can cause indefinite yellowing and thinning of grass, as well as large patches of dead turfgrass.
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5475315 SMPT Lethal Bronzing Palm1
Dieback or Thinning Canopy
Lethal Bronzing Of Palms
Formerly called Texas Phoenix Palm Decline, lethal bronzing of palms is a disease caused by a phytoplasma, which is a bacterium-like organism. Once symptoms appear, infected trees die.
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Pest And Disease Phytophthora Bleeding Canker Banner 1440X500
Substance on Leaf or Oozing
Phytophthora Bleeding Canker
Phytophthora bleeding canker is a disease caused by multiple species of Phytophthora, which invade the bark and outer sapwood of trees.
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Pest And Disease Center Powdery Mildew On Lawn Banner 1440X500
Mold or Fungus
Powdery Mildew On Lawns
Powdery mildew can be caused by many different species of fungi. The fungi leave a white powdery appearance on the surface of blades of grass.
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Pest And Disease Ash Flower Gall Mite Banner 1440X500
Bumps or Blisters on Leaf or Needle
Ash Flower Gall
Ash flower gall is a symptom of feeding activity of microscopic mites known as ash flower gall mites.
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Pest And Disease Center Western Tussock Moth Banner 1440X500
Holes or Skeletonization in Leaves
Western Tussock Moth
The western tussock moth is considered a pest and commonly found on the Pacific coast from southern California up to British Columbia.
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Pest And Disease Chlorosis Banner 1440X500
Leaf or Needle Discoloration
Chlorosis
Chlorosis is the result of a lack of chlorophyll production that may be caused by many conditions such as another disease, soil/water pH or nutritional imbalance, or tree wounds.
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