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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