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 Beech Leaf Disease Banner 1440X500
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.
Pest And Disease Birch Leafminer Banner 1440X500
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.
Pest And Disease Center Brown Patch Disease Banner 1440X500
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.
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 Center Eab Banner 1440X500
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.
Pest And Disease Center Needle Blight Banner 1440X500
Leaf or Needle Discoloration
Needle Blight & Cast Of Pines
Brown spot needle blight, Cyclaneusma needle cast, Dothistroma needle blight, and Lophodermium needle cast are common fungal diseases that attack pine needles, causing spots, blights, and premature defoliation.
Pest And Disease Center Peach Leaf Curl Banner 1440X500
Bumps or Blisters on Leaf or Needle
Peach Leaf Curl
Peach leaf curl is a disease that primarily targets peach trees just before or after bud break in the spring. Infected tree leaves will turn red, form blisters and wilt.
Pest And Disease Center Powdery Red Imported Fire Ant Banner1440x500
Red Imported Fire Ant
The red imported fire ant is an invasive species that inhabits lawns, pastures, fields and roadsides to create lumpy soil mounds. They are known to sting people and animals which can be quite painful.
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