Life table and intrinsic rate of increase of Earias vittella Fabricius on bhendi and cotton

摘要

Investigations were made on life table of Earias vittella on bhendi and cotton. The survival (IX) from egg to adult emergence was 0.39 on bhendi and 0.33 on cotton. The adults attained the greatest mean progeny production per day (mx) of 44.0 on 30thday on bhendi and of 44.2 on 31st day on cotton. The net reproductive rate (Ro) was 57.23 on bhendi and 49.06 on cotton. The innate capacity for incrase (rm) was 0.1387 on bhendi and 0.1292 on cotton while the finite rate of increase (1) was 1.15 females/day on bhendi and 1.14 females/day on cotton. The mean generation time (TC) was 29.49 days on bhendi and 30.48 days on cotton. The doubling time (DT) of the population was 5.00 days on bhendi and 5.36 days on cotton. The population would multiply 2.64times on bhendi and 2.47 times on cotton.