Evaluation of Indoxacarb Against Pyrethroid Resistant Population of Helicoverpa
The bouquet bioassay experiments under laboratory condition revealed that the percentage mortality of Helicoverpa armigera was more than 70% even at the lowest rate of 10 g a.i ha-1 (1/10th recommended dose) and the percentage survival was in the range of just 7.5-20.0% at the recommended dose of indoxacarb. Good biological efficacy of this new molecule was also reflected in the suppression of larval population and reduction of damage to bolls, squares, locules and kapas in the field. The increased susceptibility of pyrethroid resistant populations of H. armigera to indoxacarb in Tamil Nadu could be due to the activation by carboxyl esterases in to its more toxic metabolite.
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