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.
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| Leaf damaged by Maple Petiole Borer | Closer View of Damage caused by Maple Petiole Borer | Close Up View of Damaged Petiole |
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Photos by Steve Mayer, Extension Educator-Horticulture Purdue Extension Marion County |  |
| Close Up of Maple Petiole Borer Larva with Frass | Maple Petiole Borer Larva |
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Plant and Pest Digital Library Project, Purdue University, West Lafayette, Indiana.