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 Cankerworm Banner 1440X500
Holes or Skeletonization in Leaves
Cankerworms are caterpillars of several North American moths that have wingless females. Cankerworms feed on the buds and leaves of trees in early spring and can be a major pest.
Pest And Disease Center Cedar Rust Banner 1440X500
Mold or Fungus
Cedar Rust
There are multiple rust fungi that affect cedars (junipers): cedar-quince rust, cedar-hawthorn rust and cedar-apple rust. All of these rusts require two different hosts and alternate between them during the year. Cedar-quince rust appears as elongated branch swellings that produce orange spores.
Pest And Disease Center Cherry Bark Tortrix Banner 1440X500
Trunk or Bark Damage
Cherry Bark Tortrix
The cherry bark tortrix (CBT) moths are major pests in the Pacific Northwest, where they affect rosaceous trees and shrubs. Affected plants include apple, crabapple, hawthorn, Mountain ash, pear and Photinia species. Prunus species are the preferred hosts.
Pest And Disease Chicken Of The Woods Banner 1440X500
Trunk or Bark Damage
Chicken Of The Woods Mushroom
Chicken of the woods is an edible mushroom with a texture and taste that is said to resemble chicken. The fruiting bodies tend to have many shelves, and can be found up a tree trunk or as a cluster at the base of a tree.
Pest And Disease Chinch Bugs Banner 1440X500
Leaf or Needle Discoloration
Chinch Bugs
Chinch bugs are small black and white insects that live in thatch and damage turf by sucking the sap and injecting toxic saliva. Adults are about 1/5 long. Newly hatched, immature nymphs appear bright red with a white band across the back.
Pest And Disease Chlorosis Banner 1440X500
Leaf or Needle Discoloration
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.
Pest And Disease Center Conifer Bark Beetle Banner 1440X500
Mold or Fungus
Conifer Bark Beetle
Conifer bark beetles are beetles (of varying species) that tunnel just beneath the bark of conifer trees. Bark beetles account for over 90% of insect-related timber losses in the United States.
Pest And Disease Center Cottony Maple Scale Banner 1440X500
Mold or Fungus
Cottony Maple Scale
The cottony maple scale is a large, flat, brown scale insect found on the twigs and branches of various trees. White, cottony egg masses that resemble popcorn are its most distinguishing feature.
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