Population dynamics of Helicoverpa armigera and Melanagromyza obtusa on pigeonpea

Field experiment carried out during kharif 2016–17 revealed that incidence of the pigeonpea pod borer Helicoverpa armigera started in the 1^st week of October and reached a peak level 1.39 larvae/five plants in the 4^th week of October (at 14.80–33.50°C and RH 47.30–66.30%). Correlation coefficients between incidence and weather parameters showed that maximum temperature had a positive, and minimum temperature had negative relationship. About pod fly, Melanagromyza obtusa incidence began with 1^st week of November and reached a peak (1.20 maggots/10 pods) in the 1^st week of December (9.9022.90°C and RH 51.00–87.10%). Correlation coefficients between pod fly incidence and weather parameters showed that maximum relative humidity had a positive and minimum relative humidity and rainfall had a negative relationship.