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Biological control of the pea moth Laspeyresia nigricana Steph



Biological control of the pea moth Laspeyresia nigricana Steph



Ann Rept Ent Soc Ontario 70 : 68-72



Host material from England showing as much as 60% parasitism was sent to the Dominion Parasite Laboratory at Belleville, Ont., and 2 spp. of parasites reared out[long dash]Ascogaster quadridentatus, Glypta haesitator, and Angitia sp., Ascogaster quadridentatus lays its egg in the host egg, develops slowly and when still in the first stadium overwinters within the mature host larva. The following spring it develops rapidly, leaves the host, spins a cocoon and emerges about the same time as the host. G. haesitator attacks early larval stages of the host, depositing its eggs internally and also overwintering in the 1st stadium. It completes its development in the spring and emerges somewhat later than the host moth. Synchronization of host and these 2 parasites in the field should be good. From a total of 85,500 host larvae received from England since 1936, 15,563 host moths, 7664 A. quadridentatus, and 2906 G. haesitator have emerged, and the great majority of the parasites have been liberated in British Columbia, Quebec, and Nova Scotia. So far G. haesitator has been recovered in sufficient numbers in Br. Columbia to give promise of eventual establishment.

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