Insects, Pests, Diseases & Weeds
The maple petiole borer, Caulocampus acericaulis (MacGillivray), was first introduced into the United States from Europe. This sawfly is wasp-like in appearance and is rarely seen because of its small size. Although several species of maple are subject to attack by this insect, sugar maples are preferred.
"SP290-M Maple Petiole Borer," The University of Tennessee Agricultural Extension Service, SP290M 06-0263, http://trace.tennessee.edu/utk_agexfores/92