Vol. 7, Issue 12, Part E (2025)

Investigation on “Assessment of Population Dynamics of Helicoverpa armigera (H.) in Kharif Groundnut” was carried out at Main Oilseed Research Station, Junagadh Agricultural University, Junagadh during kharif, 2024. The result of population dynamics on H. armigera indicated that the larval population of H. armigera initiated from 29^th SMW and continued till 40^th SMW i.e. 3^rd week of July to 1^st week of October. Larval population ranged from 0.05 to 3.54 larvae per plant during this period. There was gradual increase in the larval population which attained peak during 33^rd SMW i.e. during 2^nd week of August with the larval population of 3.53 larvae per plant. Reduction in the larval population of H. armigera was seen with 2.82 larvae during 34^th SMW and thereafter, minimum larval population was observed i.e. 0.05 larvae per plant during 40^th SMW i.e. during 1^st week of October. The correlation analysis between weather parameters and larval population was significantly positive with morning relative humidity (r=0.544). However, non-significant positive correlation with evening and mean relative humidity (r=0.487 and r=0.529, respectively), wind speed (r=0.416), morning and evening vapour pressure (r=0.003 and r=0.230, respectively) and rainy days (r=0.201).