Abstract
Laboratory experiments on effects of submergence of larch sawfly cocoons, immediately after the overwintering period, confirmed earlier reports on the resistance of the eonymphal stage to flooding. An ichneumonid parasite, Mesoleius tenthredinis Morley, appeared able to survive flooding as well as the host, but the tachinid Bessa harveyi (Tnsd.) was found susceptible even when the flooding was of short duration. The early inception of growth and the rapid development of B. harveyi maggots, and the resultant active metabolism, seemed to account for its susceptibility to submersion. Sawfly larvae parasitized by this fly were found to have a higher rate of oxygen consumption than unparasitized larvae. Susceptibility to submersion seems to be a factor limiting the effectiveness of B. harveyi , and may account for its reported sporadic distribution in localized areas.
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