Neodiprion swainei, a defoliating s a w f l y specific t o jack pine

Dioryctria reniculella may be occasionally found in abundance feeding on cones and foliage of spruce in Quebec. In this paper, the life history, habits, and description of immature stages as yet unreported in the literature are presented, along with short notes on populations and natural control organisms.

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Laboratory experiments at various constant temperatures indicate a theoretical threshold of about 40°F. for spinning of cocoons by eonymphal larvae of Neodiprion swainei Midd. As temperatures fall below 52.5°F. the increase in mortality and time required to spin is pronounced. The optimum temperature is estimated to be around 60°F. Field investigations for three consecutive years show a close correlation between rate of spinning and temperature. Temperature is considered as a prime factor influencing the spinning of cocoons and is possibly one of the more important factors governing the population dynamics of N. swainei in the Province of Quebec.

Can. Ent. 109: 789-796 (1977) Parasitism by Apanteles and Glypta spp. on spruce budworm in five localities in Quebec in 1975 was exceptionally high, averaging 52%. The frequency distribution of attacks of these species, and the outcome of inter-and intraspecific progeny competition are described, using dissection data. Superparasitism occurred on a Poisson distribution, but rates of multiparasitism lower than expected indicate interference between Apanteles and Glypta spp. ResumeDan cinq localites au Quebec en 1975, la moyenne du parasitisme par Apanteles et Glypta spp. sur la tordeuse des bourgeons d'tpinette etait de 52%, un taux de parasitisme exceptionnalement haut. La frequence de distribution des attaques de ces esptces et le resultat de la competition intra-et interspecifique de la proginiture de ces parasites sont decrites, au moyen de donntes de dissection. Le superparasitisme etait decrit par une distribution de Poisson, mais les taux de multiparasitisme, plus bas que prevus, indiquaient de I'interference entre Apanteles et Glypta spp.