Rate of development of disease (r) was highly correlated to minimum temparature (0.69) and maximum relative humidity (0.74). Rainfall was also found positively correlated with the rate of diseases development. The "r" was also positively correlated to AUDPC values. Disease severity was negatively correlated with minimum temperature, relative humidity and rainfall but it was positively correlated with maximum temperature. Logistic model was more appropriate in estimating development of late leafspot, compared to the auto cross regressive linear model.