Journal of Economic Entomology (1994) 87, 866-871

A. Rami Horowitz (1994)
Managing resistance to insect growth regulators in the sweetpotato whitefly (Homoptera: Aleyrodidae)
Journal of Economic Entomology 87 (4), 866-871
Abstract: Insecticide resistance in the sweetpotato whitefly, Bemisia tabaci (Gennadius), was monitored during 1991 and 1992 in a rose greenhouse and in adjacent cotton fields located in the western Negev of Israel. The whiteflies were collected and exposed to a series of concentrations of the insect growth regulators (IGRs) buprofezin and pyriproxyfen. Assays done on whiteflies obtained from the greenhouse indicated an ~4-fold increase in tolerance to buprofezin after two successive applications of this compound. A relatively high level. of resistance to pyriproxyfen was recorded after three successive applications of this compound. At LC₅₀, the resistance ratio value for suppression of egg-hatch was 554-fold; for adult emergence failure, the resistance ratio was 10-fold. In contrast, one treatment of pyriproxyfen in cotton fields during the summer seasons (in accordance with the cotton insecticide resistance management [IRM] strategy) did not alter the susceptibility of B. tabaci appreciably to this compound. The rapid development of resistance to the novel IGRs demonstrates the need for IRM strategy, in both field and greenhouse crops. To prevent development of resistance to these compounds, use of both pyriproxyfen and buprofezin should be restricted to one treatment per crop season during the period of peak activity of the pest.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Abraham Rami Horowitz

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

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Bemisia tabaci	Cotton (Gossypium)	Israel
	Bemisia tabaci	Rosa (crop)	Israel