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Lack of cross‐resistance to Mtx1 from Bacillus sphaericus in B. sphaericus ‐resistant Culex quinquefasciatus (Diptera: Culicidae)
Author(s) -
Wei Suzhen,
Cai Quanxin,
Cai Yajun,
Yuan Zhiming
Publication year - 2007
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.1319
Subject(s) - culex quinquefasciatus , bacillus sphaericus , biology , toxin , aedes albopictus , pore forming toxin , bacillales , microbiology and biotechnology , cross resistance , toxicity , biological pest control , bacillaceae , larva , toxicology , botany , bacteria , chemistry , microbial toxins , genetics , bacillus subtilis , aedes aegypti , organic chemistry
The toxicities of Mtx1 toxin against dipteran and lepidopteran species have been evaluated in this study. It was shown that Mtx1 has little or no toxicity to the tested lepidopteran species, but has moderate‐level toxicity to Aedes albopictus Skuse (Diptera: Culicidae) and high‐level toxicity to both susceptible and binary toxin‐resistant Culex quinquefasciatus Say (Diptera: Culicidae). The LC 50 values of Mtx1 against a susceptible C. quinquefasciatus colony SLCq and two resistant colonies RLCq1/C3‐41 and RLCq2/IAB59 selected in the laboratory with Bacillus sphaericus (Mayer & Neide) strains C3‐41 and IAB59 respectively were 0.508, 0.854 and 0.675 mg L −1 respectively. The data indicate that Mtx1 has a different mode of action from the binary toxin, and that it could be an alternative toxin to delay or overcome resistance development to binary toxin in C. quinquefasciatus. Copyright © 2007 Society of Chemical Industry