New Zealand Plant Protection 53 (2000): 163-167
Resistance to the organophosphate insecticide azinphos-methyl has been previously identified in two species of leafroller (Lepidoptera: Tortricidae) in New Zealand. This study confirmed resistance in a third species,Ctenopseustis obliquana. Populations of Epiphyas postvittana, Planotortrix. octo and C. obliquana resistant to azinphos-methyl were not cross-resistant to lufenuron. A separate population of C. obliquana was resistant to taufluvalinate. Cross-resistance between azinphosmethyl and tebufenozide occurred in P. octo and C. obliquana, but not in E. postvittana. This difference in cross-resistance between the three species suggests that at least two different detoxification mechanisms may be operating. Therefore we cannot generalise about whether resistant populations of each species will be fully susceptible to new insecticides. Lufenuron is recommended as a key insecticide within a resistance management programme for leafrollers, while tebufenozide should be used with caution.
Keywords: leafroller, Tortricidae, insecticide resistance, organophosphate, insect growth regulator.
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