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 Scale Insects Banner 1440X500
Leaf or Needle Discoloration
Scale Insects
Scales are sap-sucking insects common on backyard trees and ornamental shrubs. These pests are mostly immobile and appear similar to shell-like bumps rather than insects.
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Pest And Disease Center Fire Blight Banner 1440X500
Wilted or Curled Leaves
Fire Blight
Fire Blight is a bacterial disease affecting apples, pears, and some other members of the family Rosaceae. It is a serious concern to apple and pear producers. Under the right conditions, it can destroy an entire orchard in a single growing season.
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Pest And Disease Fusarium Blight Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Fusarium Blight / Summer Patch
Fusarium blight or summer patch diseases are fungal diseases caused by weak pathogenic fungi that infect turf impacted by adverse environmental or cultural factors.
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Pest And Disease Hen Of The Woods Banner 1440X500
Mold or Fungus
Hen Of The Woods Mushroom
The hen of the woods mushroom, or maitake mushroom, is a fungus that is commonly found at the base of oaks and other hardwoods. It is large, dark gray-brown in color, and grows in clusters of fan-shaped, wavy caps.
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Pest And Disease Center Iron Chlorosis Banner 1440X500
Leaf or Needle Discoloration
Iron Chlorosis
Iron chlorosis is a yellowing of plant leaves often caused by iron deficiency that affects many desirable landscape plants in North America. The primary symptom of iron deficiency is interveinal chlorosis, the development of a yellow leaf with a network of dark green veins.
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Pest And Disease White Pine Weevil 1440X500
Holes or Skeletonization in Leaves
California Oakworm
The California oakworm is a caterpillar species that feeds on oak trees throughout California. The larva is about 1-inch long with yellow/green bodies and black stripes down either side and a light orange/brown head. Adult moths are small with tan/gray wings.
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Pest And Disease Canker Banner 1440X500
Trunk or Bark Damage
Fungal Cankers On Trees
Cankers are caused by various species of fungi that infect wounded or stressed trees. The canker itself is the dead area on the bark that can be found on the trunk or branches.
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Pest And Disease Dryads Saddle Banner 1440X500
Mold or Fungus
Dryad's Saddle Mushroom
Dryad’s saddle, also known as pheasant’s back, is a large, scaled cap mushroom that can decay dead trees and the sapwood of living trees.
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