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Symptoms are curled leaves beyond the petiole. Examination of the petiole reveals a hollow hole. This borer is a sawfly that has one generation a year. Though many leaves can be lost in a single year, there is no detrimental damage.
Click on the small image to view a larger image.
|Leaf damaged by Maple Petiole Borer||Closer View of Damage caused by Maple Petiole Borer||Close Up View of
|Photos by Steve Mayer, Extension Educator-Horticulture Purdue Extension Marion County|
|Close Up of Maple Petiole Borer Larva with Frass||Maple Petiole Borer Larva|
Plant and Pest Digital Library and Digitally Assisted Diagnosis, Purdue University, West Lafayette, Indiana.