Abstract
A strain of the diamondback moth, Plutella xylostella (L.), collected from cabbage fields in Hastings, FL, developed high levels of resistance to pyrethroid and carbamate insecticides compared with a susceptible strain. Resistance to permethrin was inherited as an incompletely recessive, autosomal factor, whereas resistance to methomyl was inherited in an incompletely dominant, autosomal manner. The resistance was associated with increased microsomal oxidase activities in this strain. The F1 progeny of the susceptible and resistant strains displayed intermediate levels of microsomal epoxidase and O-demethylase activities compared with the two parental strains.
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