אסיף מאגר המחקר החקלאי

Biorational insecticides: Mechanism and cross-resistance

Year:

2005

Source of publication :

Authors :

Volume :

58

Co-Authors:

Ishaaya, I., Department of Entomology, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel, Department of Entomology, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Kontsedalov, S., Department of Entomology, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
Horowitz, A.R., Department of Entomology, Agricultural Research Organization, Gilat Research Center, M.P. Negev, Israel

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Abstract:

Potency and cross-resistance of various biorational insecticides, exemplified by the whitefly Bemisia tabaci, have been studied. Bemisia tabaci were exposed to the juvenile hormone mimic pyriproxyfen for the past 12 years resulting in an over 2,000-fold resistance, but there was no appreciable cross-resistance with the benzoylphenyl urea novaluron. Similarly, no cross-resistance was found between pyriproxyfen and the two neonicotinoids, acetamiprid and imidacloprid. On the other hand, a slight cross-resistance of 5-13-fold was observed with another neonicotinoid thiamethoxam. Among the neonicotinoids, a resistant strain of B. tabaci to thiamethoxam (∼100-fold) showed no appreciable cross-resistance to either acetamiprid or imidacloprid, while another strain 500-fold resistant to thiamethoxam resulted in a mild of 4-6-fold resistance to acetamiprid and imidacloprid. In other assays, B. tabaci strain resistant to thiamethoxam (∼100-fold) had no cross-resistance to pyriproxyfen. Our findings indicate that no appreciable cross-resistance was observed between the benzoylphenyl urea novaluron, the juvenile hormone mimic pyriproxyfen, and the neonicotinoids acetamiprid and imidacloprid. Hence, these compounds could be used as components in insecticide resistance management programs. © 2005 Wiley-Liss, Inc.

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