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 Phytophthora Bleeding Canker Banner 1440X500
Substance on Leaf or Oozing
Phytophthora Bleeding Canker
Phytophthora bleeding canker is a disease caused by multiple species of Phytophthora, which invade the bark and outer sapwood of trees.
Pest And Disease Center Powdery Mildew On Lawn Banner 1440X500
Mold or Fungus
Powdery Mildew On Lawns
Powdery mildew can be caused by many different species of fungi. The fungi leave a white powdery appearance on the surface of blades of grass.
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.
Pest And Disease Borers Banner 1440X500
Trunk or Bark Damage
Tree Borers
Borers are chewing insects, usually in larval stages, that chew and feed on the inner bark and/or wood of trees. Most species are the larvae of beetles.
Pest And Disease Crabgrass Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
There are several species of crabgrass. Common crabgrass is one of the most undesirable and dominant weeds in home lawns. A lighter shade of green than typical turfgrasses, it has a coarse texture and clumpy appearance.
Pest And Disease Dollar Spot Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Dollar Spot Fungus
Dollar spot is caused by a fungus that causes blight to grass blades, but does not harm roots or crowns. Infections start as small circular areas about the size of a silver dollar, hence the name.
Pest And Disease Eastern Spruce Gall Adelgid Banner 1440X500
Growth on Foliage or Branch
Eastern Spruce Gall Adelgid
The Eastern spruce gall adelgid, Adelges abietis, is a soft-bodied, aphid-like insect that sucks plant juices. As immature adelgids feed, they form cone-shaped galls containing more adelgids. These galls can cause disfigurement and weaken trees, which may lead to their decline or death.
Pest And Disease Elongate Hemlock Scale Banner 1440X500
Leaf or Needle Discoloration
Elongate Hemlock Scale
Elongate hemlock scale is an armored scale pest with a hard, waxy coating. Small, oblong, flattened insects appear on lower needle surfaces.
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