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 Gray Leaf Spot Disease Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Gray Leaf Spot Disease
Gray Leaf Spot (GLS) is a fungal disease that affects various turfgrasses. Lesions start as olive green to brown, water-soaked dots, no larger than a pinhead. As the infection progresses, the lesions become larger and ash-colored with purple to brown margins.
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.
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.
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
Thyronectria Canker
Mold or Fungus
Thyronectria Canker
Thryonectria canker is caused by a fungus called Thyronectria austroamericana. It infects honeylocust, especially those stressed from other factors. The fungus causes cankers, on branches and trunks.
Pest And Disease Tick Control Banner 1440X500
Tick Control
Ticks are small, wingless, bloodsucking arthropods. They burrow their heads into their host and can change drastically in shape, color and size when they become engorged with blood. Ticks have extremely small mouths that usually go unnoticed when they bite.
Pest And Disease Turkey Tail Banner 1440X500
Mold or Fungus
Turkey Tails
Turkey tail is a polypore mushroom that gets its name from the variety of colors and shape that resemble the tail feathers of wild turkeys.
Pest And Disease Verticillium Wilt Banner 1440X500
Leaf or Needle Discoloration
Verticillium Wilt
Verticillium wilt is a fungal disease that causes serious injury and often death to its host. It is caused by the fungus Verticillium dahliae and can live in the soil for long periods of time without showing any signs.
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