Population dynamics of Earias vittella and Helicoverpa armigera of okra

Abstract

The shoot and fruit borer, Earias vittella first time observed in 41th SMW recorded 0.4 larvae/ plant thereafter it was build up continuously and reached its peak level in 41 SMW noted 5.2 larvae/ plant. The infestation of fruit borer, Helicoverpa. armigera noticed from 33 SMW to 43 SMW i.e. up-to last picking and the peak level of fruit borer reached in 39 SMW and observed 1.6 larvae/ plant. Weather parameters viz, maximum temperature showed positive non-significant correlation with both borers, minimum temperature showed negative significant correlation in E. vittella and non-significant in H. armigera, morning relative humidity exhibited negative non-significant correlation with E. vittella and positive non-significant with H. armigera. While rainfall expressed negative non-significant correlation with both borers.