- Anthracnose fungi may cause defoliation of most maple,
oak, elm, walnut, birch, sycamore, and hickory species and,
occasionally, of ash and linden trees. Damage of this type usually
occurs after unusually cool, wet weather during bud break. Single
attacks are seldom harmful to the tree, but yearly infections will
cause reduced growth and may predispose the tree to other stresses.
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