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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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.

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.

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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Insect & Disease
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