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

Article Abstract:

The Cry19A polypeptide from Bacillus thuringiensis subsp. jegathesan may be effective against Culex quinguefasciatus mosquitoes that are resistant to B. thuringiensis subsp. israelensis toxins. There are no field reports of such resistance as of April, 2001, but laboratory studies show that resistance can develop.

Control, Mosquito control

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Influence of exposure to single versus multiple toxins of Bacillus thuringiensis subsp. israelensis on development of resistance in the mosquito Culex quinquefasciatus (Diptera: Culicidae)

Article Abstract:

The effects of selection by single or multiple toxins of Bacillus thuringiensis subsp. israelensis on the evolution of resistance in target insects were analyzed in colonies of Culex quinquefasciatus. The development of resistance in colonies of Culex quinquefasciatus was delayed by the natural mixture of four Bacillus thuringiensis subsp. israelensis toxins via two distinct modes of action. Furthermore, the magnitude of resistance was inversely related to the number of toxins used in the selections.

Analysis, Physiological aspects, Insecticide resistance

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Variable cross-resistance to Cry11B from Bacillus thuringiensis subsp. jegathesan in Culex quinquefasciatus (diptera: culicidae) resistant to single or multiple toxins of Bacillus thuringiensis subsp. israelensis

Article Abstract:

Strains of the mosquito Culex quinquefasciatus with high levels of resistance to single and multiple toxins of Bacillus thuringiensis subsp. israelensis display low levels of cross-resistance to B. thuringiensis subsp. jegathesan. Moreover, the strains display moderate to high levels of cross-resistance to Cry11B, one of the toxins in B. thuringiensis subsp. jegathesan. However, the cross-resistance to Cry11B can be suppressed in two of the strains by combining Cry11B with Cyt1A.

Natural immunity

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