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Journal of Entomology

Year: 2004  |  Volume: 1  |  Issue: 1  |  Page No.: 17 - 20

Pattern of Cross Resistance in Lambdacyhalothrin and Betacyfluthrin Selected Populations of Helicoverpa armigera Hub.

T. Ramasubramanian and A. Regupathy


In Helicoverpa armigera, withdrawal of selection pressure for fourteen consecutive generations resulted in 2.58 and 3.01 fold increase in the susceptibility to lambdacyhalothrin and betacyfluthrin, respectively. Similarly, continuous selection enhanced the resistance level to the extent of 6.77 and 7.14 fold to the respective pyrethroids. Populations selected for resistance to lambdacyhalothrin and betacyfluthrin showed positive cross resistance to all other pyrethroids tested and no cross resistance to endosulfan. The increased level of mixed function oxidases with advancement of generation favoured the positive cross resistance among the pyrethroids.

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