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Extent of suppression of paddy yellow stem borer population by eleven selected pesticide formulations (9 biopesticide + 2 synthetic pesticide) was studied in the field of paddy cultivar Swarna mashuri (MTU 7029) during three consecutive kharif crop seasons of 2007-2009 at Raiganj, Uttar Dinajpur, West Bengal, India. Experiment was done following complete randomized block design and had three replications for each year. All treatments were significantly effective in checking stem borer infestation causing the decrease of both dead heart (DH) and white head (WH) number. Numerically, least damage was noted for monocrotophos 36 WSC. This was followed by carbofuran 3G, nimbecidine - 2.5%, neem seed kernel extract (NSKE) - 5%, B. thuringiensis-2ml/L, neem leaf extract (NLE)- 2%, neem oil-2%, karanja seed kernel extract (KSKE)-5%, mahua oil-2%, Vitex negundo extract in ascending order. The control plot has registered maximum DH and WH. In consideration of yield increase over control, maximum efficacy was registered for monocrotophos respectively followed by carbofuran, nimbecidine, B.thuringiensis ,NSKE ,NLE, mahua oil, neem oil, KSKE, V. negundo and plant mixture in descending order. Significant differences in the number of effective tillers/m2, panicle/m2 leaf area index and dry matter production/ m2 in consideration of different treatment formulation was noted. But plant height, panicle length, and 1000 seed grain weight differed insignificantly.
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