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
Pest And Disease Botryosphaeria Banner 1440X500
Dieback or Thinning Canopy
Botryosphaeria Canker & Dieback
Botryosphaeria canker is a fungal disease that infects many trees and woody shrubs, especially if they are already stressed or weakened. It causes cankers and dieback.
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Pest And Disease Boxwood Blight Banner 1440X500
Leaf or Needle Discoloration
Boxwood Blight
Boxwood blight is a serious disease caused by a fungal pathogen, Calonectria pseudonaviculata; previously named Cylindrocladium buxicola.
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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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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 Center Spruce Spider Mites Banner 1440X500
Leaf or Needle Discoloration
Spruce Spider Mites
Ranging in color from green to orange-red, spruce spider mites are conifer-loving pests that overwinter as orange eggs at the base of needles and twigs. After hatching and molting several times, the adults mate and lay eggs. There can be six to eight generations each season, depending on temperature
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