Abstract
Three species of parasitic Hymenoptera (Pteromalidae) attacking the common house fly, Musca domestica L., responded positively to storage of their mature larvae at 10° C for 55 and 180 days. Cold-treated Muscidifurax raptor Girault and Sanders and M. zaraptor Kogan and Legner showed increased reproductive potentials, longevities and fecundities, and produced progeny with a total greater biomass. Spalangia endius Walker gained in longevity and seemed to produce larger progeny. Thus, certain parasite species may be improved for use in biological control through cold storage techniques. Some insight into parasite overwintering survival may be obtained from the positive effects of exposure to low temperatures.
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