Insect & Disease
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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

Leaf or Needle Discoloration

Pepper Tree Psyllid

A member of the insect family commonly known as “jumping plant lice,” the pepper tree psyllid sucks sap from trees, leaving a discolored and sparse tree canopy.

Brown, Spotted, or Patch Grass on Lawn

Thatch

Thatch is a dense buildup of grass stems, roots and blades that accumulates between the leaf blade base and the surface of the soil.

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.

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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