Changes in the Resistance Pattern of a Fluoroacetate-Resistant Fly Strain1

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Abstract
Selection of an insecticide-susceptible house fly, Musca domestica L., strain with fluoroacetate produced moderate resistance to fluoroacetate during the first 65 generations of selection. After the 75th generation, resistance increased sharply, reaching 500 µg of fluoroacetate per fly at the 81st generation of selection. Selection with fluoroacetate for 57 generations caused a 200-fold increase in DDT-resistance. After further selection, this high level dropped gradually to 8-fold only. An 8000-fold increase in resistance to dieldrin was observed after 25 generations of selection with fluoroacetate. Duringing the next 20 generations this high level of dieldrin resistance declined considerably. When selection with fluoroacetate was discontinued after the 17th generation, the levels of DDT and dieldrin resistance were maintained for another 40 generations. Later on they declined, while always remaining above those of the corresponding strain, selected continuously with fluoroacetate. No resistance developed to the organophosphorus insecticides parathion, malathion, and trichlorfon.

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