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 Zimmerman Pine Moth Banner 1440X500
Webs or Bags
Zimmerman Pine Moth
Zimmerman pine moths are 5/8” long with gray wings marked with mottled red and gray. Once a year, their larvae hatch and tunnel into trees, interfering with the tree’s sap flow and weakening them. Eventually, wind may break the weakened tops.
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Armyworms Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Fall Armyworms
Fall armyworm caterpillars eat the leaves and stems of turfgrasses, but typically do not destroy the crown of the plant. Early feeding damage can resemble drought stressed turf, but can quickly progress to complete browning of the entire stand when caterpillars are present in large numbers.
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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 Center Gypsy Moth Banner 1440X500
Leaf or Needle Discoloration
Spongy Moth (Formerly Gypsy Moth)
Spongy moths are insects who can cause extreme defoliation to trees when in their caterpillar stage.
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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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