Population studies of Helicoverpa armigera (Hubner) moth in light trap indicated the higher trap catches in the month of January followed by March. In the month of February, the moth population was comparatively low. Different weather factors existed during the crop period (maximum, minimum temperature; relative humidity and rainfall) indicate that, temperature and relative humidity had significant effect on increase/ decrease in the moth catches. However, effect of different weather parameters was not consistent. Larvae of Helicoverpa armigera in the crop were remain at low level during first two weeks in the month of January and started increasing from the last week of January. Larval population was in peak in the month of February during both the years (1994-1995 and 1995-1996).