Biological and Toxicological Studies of the Little House Fly1

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Abstract
A laboratory method of rearing Fannia canicular is is reported along with observations on the biology at a temperature of 80[degree] F and 65% relative humidity. Under these conditions, the egg stage lasted from 36 to 48 hours, the larval stage from 8 to 10 days, and the pupal stage from 8 to 12 days. The preoviposition period for the female lasted from 4 to 5 days. The complete cycle from egg to egg required from 24 to 29 days. Toxicity studies revealed that the female was 85 times more tolerant to DDT, 76 times more tolerant to lindane, and 2 times more tolerant to methoxychlor than the susceptible house fly. The little house fly was 10 times more susceptible to dieldrin than the house fly. Pyrethrins proved to be 4 times more toxic to the little house fly than to the house fly. Organo-phosphorous insecticides that were tested against the little house fly listed in the order of decreasing toxicity are as follows: chlorthion, Diazinon, and malathion.

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