I. Introduction: Raspberry sawfly
feeds on caneberry
foliage, preferentially on raspberry. The distribution in northen
U.S. and Canada.
II. Biology: The adult is about 6 mm long, black with yellowish red markings. The mature larva overwinters in a cocoon in the soil. Pupation occurs in the spring. Following spring emergence of adults, females oviposit in leaves at about bloom. Larvae feed on foliage, mainly on the underside, as well as on flower buds, small fruit and shoots. Larvae resemble caterpillars, but have fleshy prolegs on almost all abdominal segments (caterpillars have 2-3 anterior abdominal segments with no prolegs). Larvae are light green with white hairs projecting from rows of tubercles. Larvae reach full size (10-18 mm) in 2-3 weeks, after which they drop to the soil and dig their overwintering chambers.
IV. Control: Minor leaf feeding is of little importance; however, heavy feeding may leave foliage completely skeletonized. SpinTor may be recommended.