Key to Diseases of Oaks in the Landscape

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Oak leaves begin to show chlorotic, blister-like areas on the upper surface that can be as large as one half inch in diameter (Fig.1 & Fig.2). The lower surface has gray depressions that correspond to the raised blisters. As the disease progresses, the blisters turn brown and the leaf will curl as the blisters coalesce. Premature leaf drop also may occur. Trees are not severely damaged, but the appearance of the tree may be unsightly. All oak species are susceptible to this disease.

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