Life table studies on okra shoot and fruit borer (Earias vittella Fabricius) under laboratory condition at Raipur, Chhattisgarh

Abstract

Results on age specific life table of Earias vittella Fabricius on okra revealed life cycle of 35-40 days with highest and lowest larval mortality percent in age interval of 6-10 days (21.43%) and 21-25 days (3.92%) due to fungal development and unknown reasons, respectively. The highest and lowest expectation of life (ex) was recorded in 0-5 and 36-40 days age interval of 8.96 and 1.00 days respectively. In stage specific life table, maximum mortality (20.0%) was observed during 1st instar larval stage due to development of fungus, Aspergillus fumigates and minimum during 5th instar (1.89%) due to unknown reasons. However, the sum of K values (0.34) indicated no increase in population in the next generation.