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 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 Ash Whiteflies Banner 1440X500
Leaf or Needle Discoloration
Whitefly
Although they look like miniature white moths, whiteflies are neither moths nor flies. Instead, they are insects of varying species in the order of Homoptera, which also includes aphids, scales, and mealybugs.
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Pest And Disease Center Winter Moth Banner 1440X500
Leaf or Needle Discoloration
Winter Moth
The male fringe-winged winter moth is often seen in homes and around lights and holiday decorations in December and January. This invasive pest arrived in the U.S. and Canada from Europe.
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Pest And Disease Wood Decay Fungi Banner 1440X500
Mold or Fungus
Wood Decay Fungi In The Landscape
Certain fungi attack multiple species of trees. Mushroom growths, called conks, are seen on the lower portion of the trunk and vary in shape, size and color.
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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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