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

Dieback or Thinning Canopy

Sudden Oak Death

Sudden Oak Death (SOD) is caused by a water mold called Phytophthora ramorum. The disease is common throughout California and Oregon.

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Leaf or Needle Dropping

Ash Whitefly

Ash Whitefly is a native European and North African pest that has been harming ash, citrus and other fruit trees throughout North America (in areas such as Southern California and Florida) since the late 1980s.

Wilted or Curled Leaves

Beech Leaf Disease

Beech leaf disease (BLD) is a disease that is contributing to a localized yet significant decline of beech trees.

Leaf or Needle Discoloration

Birch Leafminer

Birch leaves develop brown, inflated blotches by mid to late spring. Leaves may be killed by small larvae inside the leaves that devour green tissues between the upper and lower surfaces.

Brown, Spotted, or Patch Grass on Lawn

Brown Patch Disease

Brown patch is a fungal disease that develops during the hot, humid conditions of summer, transforming a green lawn into one with circular brown patches a few inches to several feet in diameter. Infected grass turns a dark purplish-green before fading to light brown.

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.

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Trunk or Bark Damage

Emerald Ash Borer

Emerald ash borer (EAB) is an Asian beetle that threatens the existence of ash trees throughout North America. These insect pests have killed millions of ash trees in urban areas, woodlots, and nurseries, spreading via infested nursery stock and firewood.

Mold or Fungus

Ganoderma Butt Rot Of Urban Trees

Varnish conk, Ganoderma sessile, is a moderately aggressive species of wood decay fungi that attacks hardwoods and deciduous trees

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