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Blistered Leaves on Oak and Maple Trees - What Happened?

Grayish brown, sometimes rounded spots often cluster around the main veins of leaves. Heavily spotted leaves can become twisted and drop off the tree, which is when the blister problem may become obvious. The blister effect may not always be clear on these spots, but the spots are sometimes raised or curved.  Read more about Blistered Leaves on Oak and Maple Trees - What Happened?

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