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Sycamore Anthracnose

Sycamore anthracnose is a fungal disease that can cause leaf drop, twig dieback, cankers and the sudden death of more than 90% of a tree's new shoot growth. The fungi overwinter in dead twigs and fallen leaves. Cool, rainy weather creates perfect conditions for the spores to spread in the leaf litter. It generally appears first as small and irregular yellow, brown, dark-brown, or black spots. The spores can expand and merge to cover the whole affected area. The color of the infected part darkens as it ages. The disease can also produce cankers on petioles and on stems, causing severe defoliation.

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