Genetics of resistance of houseflies (Musca domestica L.) to pyrethroids. I. Knock-down resistance

Knock-down resistance in Musca domestica, which provides cross-resistance between DDT and pyrethroids, has been genetically separated from three different resistant populations. After careful purification of each factor, the cross-over rates between them and the visible mutants brown body and green eye were estimated. This indicated that these factors are probably identical. The influence and implications of the knock-down resistance factor, kdr, on the total resistance of populations that include it are briefly discussed.