Abstract

The present field investigation was undertaken to access the efficacy of different treatment schedules during rabi season from November to February in 2013-14 and 2014-15 respectively against whitefly Bemisia tabaci Genn Aleyrodidae Hemiptera on potato at District Seed Farm Department of Agriculture Government of West Bengal P O - Burdwan Dist - Burdwan and West Bengal All the treatment schedules were significantly superior over control in decreasing the whitefly population on potato but not all around the growing season of the crop Among the different schedules T1 in which phorate 10 G 1 5 kg a i ha was applied to the soil at the time of planting and then spraying of chlorpyriphos 20 EC 0 5 kg a i ha imidacloprid 17 8 SL 0 04 kg a i ha and cartap hydrochloride 0 75 kg a i ha were done at 40 55 and 70 days after planting DAP respectively was most effective in reducing the pest population over untreated check plot which was followed by T2 T3 T5 T6 T4 respectively The per cent reduction of whitefly population over control was found highest in T1 66 92-87 95 which was followed by T2 T3 T5 T6 and T4 respectively Marketable yield t ha of potato tubers was recorded highest in T2 26 28-26 80 which was succeeded by lowest in control T7 14 17 - 15 69 Maximum cost-benefit ratio CBR was achieved in T2 1 20 92 - 1 27 06 but it was minimum in T6 1 5 08 1 10 34