Comparative Toxicities of Seven Insecticides to House Flies (Diptera: Muscidae) and Urolepis rufipes (Ashmead) (Hymenoptera: Pteromalidae)

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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.

Document Type: Research Article

Publication date: June 1, 1988

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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