HOSTS: Pear, plum, cherry and (occasionally) apple. Also Hawthorn and Mountain Ash.

DESCRIPTION: Young larvae resemble a small slug due to the green slime that covers their body. Newly molted larvae are yellow until the slime is secreted. During the last instar the larvae lose their slimy covering and are a light orange color. At this stage they are about 3/8 inches long and have 10 pairs of legs. The adult is a black wasp about 1/5 inch long.

LIFE CYCLE: There are 2 generations in Missoula, one in June and one in late August.

CONTROLS: Note: Bt is NOT effective.

Chemical: Spray with insecticidal soap if >50% of leaves have feeding injury.