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 Turf Grubs Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Turf Grubs
Grubs are larvae of insects such as Japanese beetles, June beetles and other species that feed on grass roots in soil.
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Pest And Disease Fall Webworm Banner 1440X500
Webs or Bags
Fall Webworm
Fall webworm larvae are pale greenish-yellow with either black or red heads. They have two rows of black spots along their backs and scattered long hairs along their bodies. The caterpillars transform into white moths in the spring.
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Spanworm
Dieback or Thinning Canopy
Bruce Spanworm & Winter Moth
The winter moth and the Bruce spanworm are caterpillars that defoliate trees and shrubs.
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Pest And Disease Center Buck Moth Banner 1440X500
Holes or Skeletonization in Leaves
Buck Moth
The buck moth caterpillar is a serious pest that defoliates oaks, particularly in the southeastern United States.
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Pest And Disease Bur Oak Blight Banner 1440X500
Spotting on Leaf
Bur Oak Blight
Bur Oak Blight (BOB) is caused by a fungus named Tubakia iowensis. It is a leaf disease that attacks oak trees causing severe decline and death.
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Pest And Disease Crape Myrtle Bark Scale Banner 1440X500
Dieback or Thinning Canopy
Crape Myrtle Bark Scale
Crape myrtle bark scale (CMBS) is an invasive insect species that attacks crape myrtle trees. They are small, white or gray in color and have a felt-like appearance.
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Pest And Disease Center Eriophyid Mites Banner 1440X500
Bumps or Blisters on Leaf or Needle
Eriophyid Mites
Eriophyid mites are the smallest arthropod pests on plants. Two common eriophyid mites are ash flower gall mite (Eriophyes fraxiniflora) and pine bud mite/needle sheath mite (Trisetacus pini).
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Pest And Disease Powdery Mildew Trees And Shrubs Banner 1440X500
Substance on Leaf or Oozing
Powdery Mildew (Trees & Shrubs)
Powdery mildews, caused by numerous species of fungi, create a white powdery appearance on landscape plants.
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