Larvae skeletonize the leaf surface of most fruit trees, and occasionally other plants. This sawfly larva does not appear to have prolegs on the body. Usually two generations each year. A slug-like sawfly larva that feeds on roses. Larvae are shiny black to pale green.
Young larvae skeletonize the lower leaf surface, and older larvae chew large holes in leaves.
Several generations occur each year. Maple petiole borer. This borer is actually a sawfly and attacks several species of maple. This damage is aesthetically unpleasing to the homeowner, but can be economically troublesome to a nursery grower. Feeding damage can lead to deformed trees, which are much more difficult to sell.