Journal of Economic Entomology (1998) 91, 820-826

Nilima Prabhaker, Nick C. Toscano and Thomas J. Henneberry (1998)
Evaluation of insecticide rotations and mixtures as resistance management strategies for Bemisia argentifolii (Homoptera : Aleyrodidae)
Journal of Economic Entomology 91 (4), 820-826
Abstract: A field population of Bemisia argentifolii Bellowsand Perring was subjected to selective pressure with 5 insecticide regimens: continuous applications of bifenthrin, endosulfan, chlorpyrifos; bifenthrin-endosulfan-chlorpyrifos rotation and a 1:2 bifenthrin + endosulfan mixture. Insecticide resistance developed at variable rates in all whitefly populations under selection during this study. Selection with bifenthrin resulted in early resistance development that steadily increased under continuous selection to 752-fold by generation F₂₇^, With chlorpyrifos and endosulfan selection treatments, low levels of resistance developed in generations F₇ and F₁₅, respectively (resistance ratios of 8-fold). Resistance development in the rotation and mixture regimens was delayed for an additional 10 generations. The magnitude of resistance ranged from a high of 752-fold for the single continuous use of bifenthrin to a low of 16-fold resistance for the bifenthiin-endosulfan-chlorpyrifos rotation. The level of resistance was also low under selection by the bifenthrin + endosulfan mixture after 23 generations (resistance ratio = 17-fold). Compared with single, continuous insecticide selections in the greenhouse, the rate of resistance development was significantly reduced by rotations and mixtures of insecticides. For all insecticide-selection regimens, slopes of regression lines increased over many generations. The whitefly population treated with the bifenthrin + endosulfan mixture generated the steepest lines.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Nilima Prabhaker

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Bemisia tabaci biotype MEAM1