Abstract
SUMMARYThe bionomics of the currant clearwing moth in a heavily infested Lincolnshire black currant plantation were investigated from 1951 to 1960. 95% of overwintered larvae pupate in May; the remainder, chiefly in the older wood, carry over until the following season. The mean number of eggs laid per bush was ninety and the mean number of larvae surviving until winter was forty‐nine (59,000/acre). Pruning, parasitism and predation by tits reduced this to twenty by May, giving an overall loss of about 80% from egg to adult due to natural causes.Parathion, dipterex or gusathion, acting ovicidally, reduced surviving larvae by 80% compared with untreated controls, but a large‐scale experiment showed no crop increase in the year following successful treatment and the net economic effect of high larval infestation was negligible.
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