R.P. Palkar and V.K. Bhamare
Abstract
The key mortality factors of Helicoverpa peltigera revealed that the mortality in the early instar 13.89 and 3.33 % and; 7.16 and 23.07% owing to unknown reasons and parasitisation of C. chlorideae during first and second generations, respectively. However, 6.24 % also died due to infection of NPV. Mortality in the late instar larvae was 17.65 and 30.00 % due to NPV during first and second generations, respectively. Mortality in the pupal stage was found to be 34.77 and 57.14 % due to unknown reasons during first and second generations, respectively. Generation survival (SG) was worked out and it was 0 and 0.21 during first and second generations, respectively. Value of trend index (I) was calculated to the tune 0.38 and 0.42 during first and second generations, respectively.