Reproductive Potential, Longevity, and Weight of House Flies1 Following Treatments of Larvae with Malathion2

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Abstract
Laboratory studies on a house fly strain, with no previous exposure to insecticides, were conducted to determine the effects of 3 successive treatments with malathion added to larval media at 2 ppm to produce a mortality of 40 to 60%. Flies from larvae surviving malathion treatments produced in 3 weeks 93% as many eggs as the untreated. Longevity, based upon cumulative female-fly days, was 82% as great in these treated parents. The average number of eggs/female-fly day in the treated parents was 12% more than in the untreated parents. Eggs of the treated parents showed 2% less hatch-ability, but by the time pupation was reached, the treated exceeded the untreated group by 2%, and by 1% after emergence. Survival rate between larval and pupal stage was 5% greater in the treated group; but 1% less than the untreated group between pupal and adult stages. The parent flies surviving malathion treatments produced 12% more potential adult progeny than the untreated. This resulted largely from differences during the 1st week of the treated parents lives, at which time the treated greatly exceeded the untreated in number of eggs laid and in emergence rate of the resulting adult progeny. Adult progeny of the treated parents weighed less than those from the untreated parents.

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