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Anthracnose of Shade Trees
This article was published originally on 6/9/1995Symptoms of anthracnose, primarily on ash and sycamore, have been evident on samples arriving in the Plant Disease Clinic. The disease may occur on sycamore, ash, maple, oak, walnut, linden, hickory, and other deciduous trees. Anthracnose is caused by a number of different but closely related fungi. Each fungus is specific to the host tree if affects.
In most cases, damage caused by anthracnose is minimal and does not seriously harm established shade trees. Symptoms vary from small, circular to irregular spots that are tan, dark brown, or black, to larger blotches that are usually associated with midribs and veins. When immature leaves are infected, these leaves may become distorted. Young leaves may die and fall from the trees. If a severe infection occurs early in the growing season and defoliation occurs, a new set of leaves may emerge. On sycamores, bud, shoot, and twig blight may also occur in addition to blighted leaves.
There are several strategies to follow when trying to decrease the severity of anthracnose:
Year of Publication:
IC-470(14) -- June 9, 1995