Influence of weather factors on the extent of parasitization of Campoletis chlorideae, larval parasitoid of Helicoverpa armigera

Abstract

The field experiments were carried out to study the influence of weather factors on the extent of Parasitization of Campoletis chlorideae, larval parasitoid of Helicoverpa armigera. Parasitization of H. armigera larvae by C. chlorideae was first observed during 1st SW (01-01-14 to 07-01-14) and it remained active upto 11th SW (12-03-14 to 18-03-14). Parasitisation (15%) was recorded during 3rd SW (15-01-14 to 21-01-14), 5th SW (29-01-14 to 04-02-14) and 8th SW (19-02-14 to 25-02-14). Minimum parasitisation (05%) was recorded during 1st SW (01-01-14 to 07-01-14) and 11th SW (12-03-14 to 18-03-14). Maximum parasitisation (20%) was recorded during 4th SW (22-01-14 to 28-01-14), 7th SW (12-02-14 to 18-02-14) and 9th SW (26-02-14 to 04-03-14). During these period, maximum and minimum temperature and morning and evening relative humidity ranged from 22.3 to 24.8 0C, 9.5 to 14.3 0C, 88 to 91% and 41 to 61%, respectively.