The present study was carried out to study the population occurrence and the influence of environmental factors on Cnaphalocrocis medinalis population dynamics for the four consecutive years 2011 to 2014. The population initiated late August and early September. It built abruptly after appearance for the years 2013 to 2014, then maintained till the end of October for the year 2013 while for the year 2014 light trap catches dropped in mid- October and then increased till 2nd week of November. However, the population dropped rapidly from 3rd week of November for both the kharif seasons. Total weekly rainfall induced a significantly negative impact, while the average weekly temperature and average weekly relative humidity imparted a non-significant negative impact on C. medinalis population. A long dry spell after heavy showers resulted in outbreak of C. medinalis. Based on nature of incidence and abundance, package can be produced for rice transplantation and C. medinalis management.

Keywords: Rice, light trap, temperature, humidity, rainfall