Maple Petiole Borer
Author(s) P. J. Pellitteri, D. L. Mahr.
The maple petiole borer is an introduced species that has extended its range from the northeastern states to the Great Lakes area and the Midwest. It is commonly found in southern Wisconsin, although it generally occurs at low levels and is usually overlooked. Occasional out-breaks can appear, though, and leaf drop can be substantial. However, leaf drop rarely exceeds 25-30% of the leaves on a tree, even during peak years.
Find out about the signs and symptoms of this pest, as well as effective means of controlling it (2 pages; Revised in 1997).