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Comparative toxicities of seven insecticides to house flies (Diptera: Muscidae) and Urolepis rufipes (Ashmead) (Hymenoptera: Pteromalidae).

The toxicity of seven insecticides used for control of muscoid fly pests on dairies was evaluated against house fly, Musca domestica (L.). and its important biological control agent. Urolepis rufipes (Ashmead). The toxicity to U. rufipes (based on LC50’s) decreased in the order of dimethoate > permethrin > tetrachlorvinphos > fenvalerate > Pyrenone (pyrethrins + piperonyl butoxide) and dichlorvos > crotoxyphos. Male U. rufipes were 1.3 to 2.8 times more sensitive than females. This difference between the sexes appeared to be because of the smaller size (1.7 fold) of the males. The toxicity (µg/vial) of the seven insecticides to U. rufipes versus M. domestica revealed that fenvalerate and crotoxyphos were more toxic to M. domestica , dichlorvos and Pyrenone were more toxic to U. rufipes , and permethrin. tetrachlorvinphos, and dimethoate were equally toxic to both species. The significance of these findings to successful control of fly pests on dairies is discussed.