Anthracnose in Washington
MODERATEFungus
Anthracnose is currently active in Washington. Watch your susceptible trees closely and act early.
About Anthracnose
A group of fungal diseases causing leaf spots, cankers, and shoot blight on many shade trees. Sycamore, dogwood, maple, and oak are commonly affected. Cool, wet spring weather promotes infection of newly expanding leaves.
Symptoms to watch for
Irregular brown or tan dead areas on leaves often following veins, distorted or curled leaves, premature defoliation, twig dieback and small cankers on branches
Trees at risk in Washington
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Treatment options
Improve Air Circulation (Pruning)
Selective thinning of branches to improve air circulation and reduce leaf wetness duration. Rake and destroy fallen infected leaves in autumn to reduce overwintering inoculum.
Preventive Fungicide Application
Chlorothalonil or copper-based fungicide applied at bud break and repeated at 7-14 day intervals during wet spring weather. Most important during cool, rainy springs.
Recommended Products & Tools
Helpful supplies for managing Anthracnose. Always read and follow label directions, and confirm a diagnosis before treating.
Broad-spectrum protectant for many fungal leaf and bark diseases.
Preventive spray for needle cast, leaf spots, and blights.
Sharp, clean cuts to remove affected wood — a tree-care essential.
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Need help with Anthracnose in Washington?
Connect with ISA Certified Arborists serving Washington:
Browse all Washington arborists →Frequently asked questions
Is Anthracnose in Washington?
Anthracnose is currently active in Washington. Watch your susceptible trees closely and act early.
What does Anthracnose look like?
Irregular brown or tan dead areas on leaves often following veins, distorted or curled leaves, premature defoliation, twig dieback and small cankers on branches
What trees does Anthracnose affect in Washington?
It affects American Sycamore, Flowering Dogwood, Sugar Maple, White Oak, Black Walnut. Susceptibility varies by species.
How do I treat Anthracnose?
Options include: Improve Air Circulation (Pruning), Preventive Fungicide Application. Confirm the diagnosis before treating, and consider a certified arborist for high-value trees.