![]() Prevention: It's important to rake up all the fallen leaves each fall and compost them or burn them (if your area permits burning.) Fallen leaves provide the ideal breeding ground for anthracnose.Wet springs provide the ideal conditions for anthracnose spores to take hold. Wind blows through the infected trees and spreads spores onto new maple trees. In maple trees, it is spread in April or May in most gardening zones. ![]() How it spreads: Anthracnose spreads by airborne fungus and is especially prevalent during a wet or rainy spring. ![]() If the disease cycle repeats year after year, the tree may become stunted or deformed because it cannot keep its leaves long enough to grow. On maple trees, it causes brown or purplish-brown spots and stripes near the veins on the leaves, and the tree may lose its leaves prematurely.
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