Abstract
Incubation, larval, pupal periods, male and female longevity in C. medinalis were found to range from 4 to 5, 16 to 21, 6 to 7 and 3 to 7 days, respectively. For the control of this insect, Lorsban, methyl parathion, Lorsban and Sumithion proved effective and gave 98.49%, 99.63%, 99.07% and 99.53 % mortality at 24, 48, 72 hours and 10 days posttreatment interval, respectively. Regarding varietal resistance, Basmati 370, Bas. 385 and Bas. 198 proved comparatively more susceptible than IR6, IR8 and KS282. The susceptible varieties had more larval population, greater attraction for oviposition by the- adult female, shorter larval duration and greater survival of insects fed on them
