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Applied and Environmental Microbiology, April 2001, p. 1956-1958, Vol. 67, No. 4
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.4.1956-1958.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Lack of Cross-Resistance to Cry19A from Bacillus thuringiensis subsp. jegathesan in Culex quinquefasciatus (Diptera: Culicidae) Resistant to Cry Toxins from Bacillus thuringiensis subsp. israelensis

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

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

Received 25 September 2000/Accepted 12 January 2001

Culex quinquefasciatus mosquitoes with high levels of resistance to single or multiple toxins from Bacillus thuringiensis subsp. israelensis were tested for cross-resistance to the Bacillus thuringiensis subsp. jegathesan polypeptide Cry19A. No cross-resistance was detected in mosquitoes that had been selected with the Cry11A, Cry4A and Cry4B, or Cry4A, Cry4B, Cry11A, and CytA toxins. A low but statistically significant level of cross-resistance, three to fourfold, was detected in the colony selected with Cry4A, Cry4B, and Cry11A. This cross-resistance was similar to that previously detected with B. thuringiensis subsp. jegathesan in the same colony. These data help explain the toxicity of B. thuringiensis subsp. jegathesan against the resistant colonies and indicate that the Cry19A polypeptide might be useful in managing resistance and/or as a component of synthetic combinations of mosquitocidal toxins.

* Corresponding author. Mailing address: Margaret C. Wirth, 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, April 2001, p. 1956-1958, Vol. 67, No. 4
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.4.1956-1958.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


This article has been cited by other articles:

  • Abdullah, M. A. F., Dean, D. H. (2004). Enhancement of Cry19Aa Mosquitocidal Activity against Aedes aegypti by Mutations in the Putative Loop Regions of Domain II. Appl. Environ. Microbiol. 70: 3769-3771 [Abstract] [Full Text]  


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