Ecological life table of Earias vittella on okra under field condition

Abstract

Field life table of Earias vittella indicated that egg stage contributed 20 per cent mortality mainly due to egg sterility. Younger and older larval group contributed 25.94 and 8.73 per cent mortality, respectively. Viral, bacterial, fungal infection, Cotesia sp, etc. was key mortality factors operating under field conditions. The value of generation survival and trend index was found 0.44811 and 0.0166, respectively. In immature stages the maximum mortality was recorded during pupal stage which was recorded 0.1637 value of ‘K’s while, lest mortality was observed in the older larval group with a 0.0645 ‘K’s value.