Abstract
Spray-tower applications of heptachlor, aldrin, dieldrin, endrin, and lindane to both cyclodiene-susceptible and cyclodiene-resistant strains of onion maggot, Hylemya antiqua (Meigen), adults showed resistance levels of ×647.1, ×591.2, ×356.6, ×27.2, and ×14.3, respectively. There was no cross-resistance to DDT or diazinon. Similar applications with 6 other organophosphate insecticides showed no significant difference in susceptibility between the 2 strains. When compared at the LD50, naled was the most toxic material followed by diazinon, parathion, carbophenothion, malathion, Nemacide® (O- (2–4-dichlorophenyl) O,O-diethyl phosphorothioate), and ethion. Diazinon was equitoxic to aldrin when tested against the susceptible strain. The slope of the regression line, LD50, and fiducial limits of the LD50 for 13 insecticides on both strains are presented.
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