Author(s): D. DAHAL, P.S.MEDDA* AND J. GHOSH

Abstract: Seasonal incidence, correlation studies and efficacy of some insecticides of white fly (Dialeurodes pallida Singh) on betel vine were conducted in the Instructional Farm, Uttar Banga Krishi Viswavidyalaya, Pundibari, Coochbehar, West Bengal during November,2005 to April, 2007. the whitefly was found active throughout the year but the maximum population was observed during last week of November to December. Population of whitefly showed negative correlation against maximum & minimum temperature and rainfall while positive correlation to maximum humidity. The R2 value suggested 72% variation in leaf infestation due to various climatic factors. Out of ten (10) synthetic as well as botanical insecticides, imidachloprid was found to be most effective to suppress the population of whitefly which resulted 89.87%, 73.45% and 60.31% mortality at 3,8 and 14 days after spraying..

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