This species is rarely of commercial significance but it can cause defoliation of gooseberry bushes in allotments and gardens; currant bushes, plum trees and certain ornamental shrubs are also attacked.
Adults occur in July and August. Eggs are laid on the leaves of host plants and they hatch about 2 weeks later. Young larvae feed briefly and then overwinter. They become active again at bud burst (much earlier than larvae of the common gooseberry sawffy, Nematus ribesii, p. 251). When disturbed, larvae often drop from the foliage but will dangle on a thread of silk, adopting a U-shaped posture. Larvae are fully grown in May or June. They then pupate on the host plant, or on nearby walls and fences, larvae at first spinning a flimsy cocoon. Although this species is usually single-brooded, under favourable conditions there may be a partial second generation.
Adult 35-40 mm wingspan, black and ochreous-yellow; forewings mainly white with large black
ish spots, a narrow yellowish-orange cross-band and a partly yellowish-orange base; hindwings mainly white with blackish markings (Fig. 304). Larva up to 40 mm long; body pale yellowish-white, extensively marked with black; two pairs of prolegs; head black (Fig. 305). Pupa 15 mm long, black with yellow cross-bands.
Was this article helpful?
You Might Just End Up Spending More Time In Planning Your Greenhouse Than Your Home Don’t Blame Us If Your Wife Gets Mad. Don't Be A Conventional Greenhouse Dreamer! Come Out Of The Mould, Build Your Own And Let Your Greenhouse Give A Better Yield Than Any Other In Town! Discover How You Can Start Your Own Greenhouse With Healthier Plants… Anytime Of The Year!