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
Brown Needles On Evergreen (Pine Or Spruce) Tree
Dieback or Thinning Canopy
Winter Desiccation
Winter desiccation is a winter injury condition affecting primarily evergreen shrubs and trees. Winter desiccation occurs most often when soil moisture is low or dry. Heavy winter winds and sun can accelerate water loss and lead to this condition.
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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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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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Ficus Gall Wasp C Mallory
Bumps or Blisters on Leaf or Needle
Ficus Gall Wasp
The ficus gall wasp is a small insect that feeds on the Indian laurel fig, causing deformed foliage and swelling.
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