A field experiment was conducted to study the seasonal incidence of H. armigera and S. litura on chilli during kharif 2001. Peak incidence of H. armigera eggs was recorded during September second fortnight and incidence of larvae was peak during November first fortnight. During cropping period H. armigera egg load ranged from 1.63 to 2.22 eggs per plant whereas, larvae ranged from 1.45 to 2.02 larvae per plant. Maximum temperature (r=0.82*) and rainfall (r=0.73*) showed the positive significant correlation with incidence of H. armigera eggs. Whereas, maximum temperature indicated positive significant relation with incidence of H. armigera larvae. Peak incidence of S. litura eggs and larvae was recorded during October first fortnight. S. litura egg load ranges from 0.026 to 0.053 egg mass per plant. Whereas larvae ranged from 0.162 to 0.573 larvae/plant. Relation between field incidence of S. litura eggs was found to be non significant with weather parameters.  However, relation between larvae of S. litura and weather parameters was highly significant with minimum temperature (r = 0.863**). The per cent fruit damage by fruit borers was  maximum (31.66%) during second picking whereas, minimum during fourth picking (27.66%).