Three species of Rhytisma can cause different lesions that begin as small light green/yellow spots on leaves that gradually increase in size and darken to dark brown/black. By early fall they can become very obvious.
Symptoms and signs include:
For maple tar spot treatment, remove and dispose infected leaf litter in the fall to reduce spore pressure the following spring.
Trees almost never show any signs of stress even after severe infections, so treatment isn’t needed. They will recover the following year.
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