Abstract: Incidence of leaf folder (LF), Cnaphalocrocis medinalis population in paddy crop (Oryza sativa L.) was assessed by light trapping during four consecutive kharif crop seasons (2005-2008) at Hemtabad, Uttar Dinajpur, West Bengal. The LF population was initiated at about 25 standard meteorological weeks (SMW), improved at first slowly up to 27 SMW then steadily up to 32 SMW attaining the maximum at about 34 SMW which was maintained up to about 37 SMW. The population then subsumed at first slowly up to 40 SMW then abruptly. Abiotic conditions such as minimum temperature, temperature gradient, maximum relative humidity and average relative humidity had significant positive influence on C. medinalis population. In case of minimum relative humidity and sunshine hours a negative influence was observed. In addition, other factors such as maximum temperature, relative humidity gradient, average relative humidity, number of rainy days and rainfall imparted insignificant positive effect on population development. Based on the nature of incidence and abundance of C. medinalis, a package can be generated and accordingly time fitted seedling transplantation as the precautionary measure may be highlighted in the northern parts of West Bengal. Key words: Leaf folder incidence Climatic factors Paddy crop Seasonalit
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