Annual Sugar Maple Leaf Drop From Petiole Borer
The annual leaf drop on sugar maples caused by the maple petiole borer (Caulocampus acericaulis) is underway in southwest Ohio. To separate leaf drop by the petiole borer rather than high winds or anthracnose, look for abnormally short petioles on the fallen leaves and for broken petioles that remain attached in the canopy.
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