Abstract
The development of permethrin resistance and its effect on existing resistance toward DDT, methomyl, and three organophosphates were examined in a strain of the house fly, Musca domestica L. (Diptera: Muscidae). This strain was collected from a dairy near Horseheads, N.Y., after 4 years of localized permethrin spraying during which time no increase in permethrin resistance (from the basal level of 1.8-fold) was detected. Under laboratory selection, resistance to permethrin developed rapidly, attaining a 5,945-fold level by generation F22. Additionally, resistance to naled, methomyl, DDT, and dichlorvos significantly increased ( P ≤ 0.05) following permethrin selection, indicating that pressure by this insecticide can enhance further the existing cross- and multiple-resistance in the strain.
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