author(s)
Suvash CH Bala

abstract
The present investigation was conducted at District Seed Farm, Bidhan Chandra Krishi Vishwavidyalaya, Kalyani, for consecutive two Rabi season 2017-18 & 2018-19. Gram pod borer, Helicoverpa armigera larval population first appeared in the field during 5^rd SMW and maintained same trend of population up to 7^th SMW. However, it reached its peak population in 11^th SMW with a population load 18 larvae/ 10 plants. Correlation coefficient of H. armigera with various abiotic factors, maximum temperature (r = 0.76) and bright sunshine hours (r =0.574) was exhibited significant positive correlation whereas minimum temperature (r = - 0.391) was found negative correlation with H. armigera larval population. So far as the management of H. armigera by used new molecule along with bio-pesticide, Cyclaniliprole 10% DC @ 350 ml/ha gave highest mortality followed by Cyclaniliprole 10% DC @ 300 ml/ha. The highest yield was obtained from Cyclaniliprole 10% DC @ 350 ml/ha treated plots (14.30 q/ha) which was statistically at par with the treatment of Cyclaniliprole 10% DC @ 300 ml/ha (13.67 q/ha).