Abstract
The median lethal dose (LD50) of emamectin benzoate 5SG when monitored against cotton pink bollworm Pectinophora gossypiella, it was found to be 0.4282 mg larva−1 for F1 generation and 0.1802 mg larva−1 for F9 generation. The LD95 was found to decrease from 3.3760 (F1) to 1.1564 mg larva−1 (F9). The susceptibility index to emamectin benzoate based on LD50 and LD95 was 2.37 and 3.03, respectively. With regard to number of generations required for 10-fold decrease in LD50, it was found to be 27. Considering the F9 populations as the most susceptible, the tentative discriminating dose was fixed as 1.1mg−1. Assessing the level of insecticide resistance as one time survey in summer cotton revealed that the % resistance of H. armigera in five districts ranged from 3.33 to 10.00. The highest resistance (10%) was observed at Coimbatore district. The survivability of fruit and shoot borer Earias vitella varied from 6.66 to 15.00% against emamectin benzoate, with Erode population being highly susceptible. The % survival of pink bollworm varied from 3.33 to 6.66% at 1.1μg larva−1.
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