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New Zealand Journal of Crop and Horticultural Science abstracts

Comparative insecticide resistance of New Zealand and North American populations of diamondback moth, Plutella xylostella (Lepidoptera: Plutellidae)

P. J. CAMERON1
A. M. SHELTON2
G. P. WALKER1
J. D. TANG2

1New Zealand Institute for Crop & Food
Research Limited
Private Bag 92 169
Auckland, New Zealand

2New York State Agricultural
Experiment Station
Department of Entomology
Cornell University, Geneva
NY 14456, United States

Abstract  The susceptibility of two New Zealand populations of diamondback moth, Plutella xylostella, to insecticides from three classes was compared with the susceptibility of a standard North American population (Geneva 88) in laboratory assays at the New York Experiment Station during 1993. Leaf dip assays showed that the New Zealand populations had developed moderate resistance to permethrin compared with the Geneva 88 population, but were still susceptible to methamidophos, Bacillus thuringiensis subsp. kurstaki, and B. thuringiensis subsp. aizawai. One of the New Zealand populations, Pukekohe 1, was 10 times more resistant to permethrin at the LC50 compared to the Geneva 88 population. This level of resistance was consistent with the greater use of synthetic pyrethroids, particularly permethrin, compared with other insecticides on vegetable brassicas at Pukekohe. Use of the Pukekohe 1 population as a standard for resistance assays in New Zealand indicated that diamondback moth from a reported control failure in Pukekohe were 4.9 times more resistant to lambdacyhalothrin, and may be as resistant to synthetic pyrethroids as the most resistant North American populations reported in Shelton et al. (1993b).

Keywords  Plutella xylostella; insecticide resistance; bioassays; synthetic pyrethroid; Bacillus thuringiensis

New Zealand Journal of Crop and Horticultural Science, 1997, Vol. 25: 117-122

0114-0671/97/2502-0117 $7.00/0 (c) The Royal Society of New Zealand 1997

PDF file of entire paper: medium quality (490K); (scanned from paper original: notes about this process)

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