Monitoring of Adult through Sex Pheromone and Larval Incidence of Gram Pod Borer (Helicoverpa armigera) in Chickpea Ecosystem of Eastern Part (Dholpur) of Rajasthan

Present investigation were carried out during Rabi season of the year 2022-23 and 2023-24 at Krishi Vigyan Kendra, Dholpur to monitor the adults population of Helicoverpa armigera by using pheromone trap. The adults population appeared first in 1^st standard week with (0.4 & 0.1 adults/trap/week) and remained active throughout the crop season i.e. upto 14^th SMW during both the years. The adults population of H. armigera attained to its peak in 8^th and 7^th SMW during 2022 and 2023-24, respectively. After the peak population, the population of H. coriandari started to decline and reached to low level in the 14th SMW near maturity of the crop during both the years. Maximum temperature had significant positive correlation (r=0.582& 0.554) during both the year and minimum temperature had positive non significant correlation (r=0.300 & 0.412), whereas morning and evening relative humidity had negative correlation with H. armigera adult population (r=-.265 & -0.496 and -0.360 & -0.784) during 2022-23 and 2023-24 respectively.Rainfall showed negative correlation (r=-0.255) in year of 2022-23 and had positive correlation (r=0.309) during 2023-24. The Larval population of H. armigera was started in the 1^st standard with a mean population of 0.86 and 0.93 larvae/MRL during rabi 2022-23 and 2023-24, respectively. Its population touched the peak with a mean of 5.93 & 5.66 larvae/MRL in 8th SMW during rabi 2022-23 and 2023-23, respectively. The larval population of H. armigera population exhibited positive significant correlation (r= 0.631 & 0.654) with maximum temperature, while larval showed positive non significant correlation with minimum temperature(r=0.355 & 0.448) whereas morning and evening relative humidity had negative correlation with H. armigera larval population (r=-0.439 & -0.545 and -0.451 & -0.664) during 2022-23 and 2023-24 respectively. Rainfall showed negative correlation (r=-0.324) in the year of 2022-23 and had positive correlation (r=0.404) with larval population during 2023-24.