Stage specific lifetable of Helicoverpa armigera (hubner) on chickpea

Lifetable studies of Helicoverpa armigera (Hubner) carried out on chickpea under laboratory condition revealed that high mortality was observed at egg, 1^st instar and pupal stages which indicated minimum survival fraction at these stages and maximum at 4^th and 6^th larval instars. The potential fecundity, doubling time and net reproductive rate was recorded more in 2^nd generation than that of 1^st generation. The mean generation time ranged from 31.98 to 36.63 days. The intrinsic rate of increase was examined to be 0.1236 females/female/day, repetitively in both the generations. Moreover, the 1^st generation recorded higher values for the finite, intrinsic and annual rate of increase of population in comparison to 2^nd generation.