New Zealand Plant Protection 53 (2000): 83-86
Imported insecticide resistance in diamondback moth
D.G. Voice and R.B. Chapman
ABSTRACT
Laboratory experiments were conducted to determine whether resistance in an Australian population of diamondback moth could be conferred to a local susceptible population of diamondback moth (Plutella xylostella). Bioassays with larvae showed a 715-fold difference in response at the LC50 to alpha-cypermethrin between the resistant imported and local susceptible populations. The response of a hybrid strain from these populations displayed a lower level of resistance, and a backcross of hybrids with the parents an even lower level of resistance. The hybrid strain did not suffer any fitness disadvantage when compared with the parents.
Keywords: Plutella xylostella, resistance, alpha-cypermethrin, bioassay.
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