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.