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Applied and Environmental Microbiology, July 2001, p. 3280-3284, Vol. 67, No. 7
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.7.3280-3284.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Cyt1Ab1 and Cyt2Ba1 from Bacillus thuringiensis subsp. medellin and B. thuringiensis subsp. israelensis Synergize Bacillus sphaericus against Aedes aegypti and Resistant Culex quinquefasciatus (Diptera: Culicidae)

Margaret C. Wirth,1,* Armelle Delécluse,2 and William E. Walton1

Department of Entomology, University of California, Riverside, California 92521,1 and Bactéries et Champignons Entomopathogènes, Institute Pasteur, Paris, France2

Received 17 November 2000/Accepted 2 April 2001

The interaction of two cytolytic toxins, Cyt1Ab from Bacillus thuringiensis subsp. medellin and Cyt2Ba from Bacillus thuringiensis subsp. israelensis, with Bacillus sphaericus was evaluated against susceptible and resistant Culex quinquefasciatus and the nonsensitive species Aedes aegypti. Mixtures of B. sphaericus with either cytolytic toxin were synergistic, and B. sphaericus resistance in C. quinquefasciatus was suppressed from >17,000- to 2-fold with a 3:1 mixture of B. sphaericus and Cyt1Ab. This trait may prove useful for combating insecticide resistance and for improving the activity of microbial insecticides.

* Corresponding author. Mailing address: Department of Entomology, University of California, Riverside, CA 92521. Phone: (909) 787-3918. Fax: (909) 787-3086. E-mail: mcwirth{at}mail.ucr.edu.

Applied and Environmental Microbiology, July 2001, p. 3280-3284, Vol. 67, No. 7
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.7.3280-3284.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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Copyright © 2001 by the American Society for Microbiology. All rights reserved.