Seasonal Incidence of Gram Pod Borer, Helicoverpa Armigera (Hubner) on Greengram

Investigations were carried out on seasonal incidence of gram pod borer, Helicoverpa armigera (Hubner) on greengram during kharif, 2008 at College Farm, Junagadh Agricultural University, Junagadh. The pest appeared with population density of 0.34 larvae per plant during 4^th week after sowing (31^st standard week) and reached to a peak of 3.42 larvae per plant in 37^th standard week (10^th week after sowing). Among the weather parameters, minimum temperature (r= -0.557) and evening relative humidity (r=-0.583) exhibited highly significant negative correlation with the gram pod borer population. Rest of the weather parameters were nonsignificantly correlated with the pest population.