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 Center Vascular Wilt Disease Banner 1440X500
Mold or Fungus
Vascular Wilt Diseases
Vascular wilt diseases are caused by different fungi that attack the vascular (water-conducting) system of trees. A tree responds by blocking its vascular system to contain the disease. In doing so, the water supply to the leaves is cut off.
Pest And Disease Ash Whiteflies Banner 1440X500
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.
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.
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