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 Wood Decay Fungi Banner 1440X500

Mold or Fungus

Wood Decay Fungi In The Landscape

Certain fungi attack multiple species of trees. Mushroom growths, called conks, are seen on the lower portion of the trunk and vary in shape, size and color.

Bumps or Blisters on Leaf or Needle

Ash Flower Gall

Ash flower gall is a symptom of feeding activity of microscopic mites known as ash flower gall mites.

Leaf or Needle Discoloration

Chlorosis

Chlorosis is the result of a lack of chlorophyll production that may be caused by many conditions such as another disease, soil/water pH or nutritional imbalance, or tree wounds.

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 Center Leaf Spot And Melting Out Banner 1440X500

Brown, Spotted, or Patch Grass on Lawn

Leaf Spot & Melting-Out

Leaf spot and melting-out are turfgrass fungal diseases that can cause indefinite yellowing and thinning of grass, as well as large patches of dead turfgrass.

Substance on Leaf or Oozing

Phytophthora Bleeding Canker

Phytophthora bleeding canker is a disease caused by multiple species of Phytophthora, which invade the bark and outer sapwood of trees.

Pest And Disease Center Powdery Mildew On Lawn Banner 1440X500

Mold or Fungus

Powdery Mildew On Lawns

Powdery mildew can be caused by many different species of fungi. The fungi leave a white powdery appearance on the surface of blades of grass.

Holes or Skeletonization in Leaves

Western Tussock Moth

The western tussock moth is considered a pest and commonly found on the Pacific coast from southern California up to British Columbia.

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