An experiment on rainfed rice was carried out for two consecutive years during 2010 and 2011 at Farmer’s Field, Patsoi-IV, Imphal West, Manipur, to study the impact of weather factors on rice leaf folder. Based on pooled mean data for two years, seasonal occurrence of C. medinalis, Kharif rice revealed that pest infestation initiated on mid of August (14-20 days after transplanting) with 3.26 per cent and continued till third week of October (77-83 days after transplanting) with 2.43 per cent. The maximum leaf damage incidence was observed during third week of September (49-55 days after transplanting) with 4.93 per cent and gradually decreased till the maturity of the crop. However, correlation coefficient study for C. medinalis was non-significant but positively correlated with mean temperature whereas mean relative humidity and mean rainfall were proved to be positive and significantly correlated (P≤0.05).
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