Monitoring of Helicoverpa armigera through pheromone and light traps on pigeonpea and impact of weather parameters on trap catch

The experiment conducted during Kharif, 2018 on pigeonpea (Cajanus cajan (I) Millsp) yielded a good amount of information on the trend of population build up of gram pod borer, Helicoverpa armigera. The peak moth population of H. armigera observed during last week of October i.e., 43rd SMW and was found significantly correlated with maximum temperature (r= 0.632), minimum temperature (r= 0.516) and evaporation (r= 0.544). All the weather variables together contributed to the incidence of H. armigera adult population by 62.00 (R2= 0.62) per cent. Whereas, the peak larval population of H. armigera observed during second week of November i.e., 45th SMW and was found significantly correlated with maximum temperature (r= 0.474), wind speed (r= 0.487) and evaporation (r= 0.479). All the weather variables together contributed to the incidence of H. armigera larval population by 74.00 (R2= 0.74) per cent. Adult and larval populations were found significantly correlated with maximum temperature and evaporation.