Look for a slight swelling, a spot-like discoloration, and a small hole in the petioles of affected leaves. Small quantities of sawdust-like frass (insect excrement) may hang from the hole. Clean holes usually indicate the caterpillars have completed their development and have exited for pupation. Damage by this borer may appear conspicuous; however, the caterpillars seldom cause significant leaf loss, so no chemical control recommendations are currently available.
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