Forewarning of incidence of Spodoptera litura (Tobacco caterpillar) in soybean and cotton using statistical and synoptic approach

A study on the effect of weather parameters population dynamics Spodoptera litura (S.litura) in soybean and cotton during kharif season using six years pest data (pheromone trap catches) at Niphad Rahuri Maharashtra showed that rainfall two weeks prior, Tmax Tmin week incidence signifiantly contributed towards occurrence S.litura soybean. Maximum temperature morning humidity one prior were found to be favourable for S. cotton. Temperature (maximum: 26-27°C & minimum: 21-22°C), relative (above 90%) congenial outbreak Similarly, maximum around 32-33°C, minimum 22-23°C, 90 per cent, sunshine hours about 4 hrs day-1 previous 2 favoured heavy crop flowering boll formation stages. It is also shown how can predicted well advance observed relationship with as forecast.