Abstract
Diamondback moth, Plutella xylostella (L.), adults from three populations in Hawaii were tested for mortality and knockdown responses to DDT, diazinon, fenvalerate, and permethrin. For each insecticide, mortality and knockdown differed significantly among populations. Males and females responded similarly. Diazinon was least toxic and permethrin was most toxic to all three populations. Overall, adult mortality and knockdown were correlated with larval LC30’s across insecticide-population combinations, but adults from one population with DDT-resistant larvae were not resistant to DDT. Monitoring resistance in diamondback moth larvae by testing pheromone-attracted males merits exploration.
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