Abstract
Laboratory tests on the effects of eleven insecticides against two colonies of the housefly, Musca domestica vicina Macquart collected from Kajiki of Kagoshima Prefecture in November of 1966, were carried out by topical application method, contact method to insecticide residues, spraying method and dipping method in laboratory. Insecticides used were as follows : dichlorvos, naled, diazinon, fenchlorphos, fenthion, fenitrothion, trichlorphon, malathion, dieldrin, lindane and DDT. Mortality after contact to the residues was higher in naled, diazinon, fenchlorphos, fenthion and fenitrothion. The others were less effective. Mortality in the spray tests was higher in dichlorvos, naled, diazinon, fenchlorphos, fenthion and fenitrothion ; and the others were less effective. In contact tests and spray tests, dichlorvos, naled and diazinon were more rapid in knockdown than the others. Both colonies of the housefly used were presumed to be the mixture of susceptible and resistant populations to dieldrin and lindane after the results of dipping tests.
