Potato (Solanum tuberosum L.), an important cash crop of India, is prone to many diseases and amongst these, late<br />blight [c.o. (Mont) de-Bary] is one of the highly destructive diseases and a major constraint<br />in the profitable cultivation of potato. After realizing the significance of controlling the devastating disease for the<br />sustainability in potato production and thus ensuring more profitability, the present investigation has been conducted<br />with an objective to assess the performance of different options of integrated management on yield of potato c.v.<br />‘Kufri Jyoti’ through reducing the disease incidence under West Bengal Condition. The present study was carried<br />out by Howrah KVK during rabi season for consecutive three years (2009-10, 2010-11 and 2011-12) as On-Farm<br />Trial mode at seven farmers fields of an adopted village of Howrah district in West Bengal. In each trial, there were<br />four treatments including one control i.e. farmers’ practice. The study concludes that the best integrated management<br />option to combat late blight disease is application of recommended doses of fertilizers (N, P2O5 and K2O in the form<br />of Urea, SSP and MOP), seed treatment with Trichoderma viridae @ 4 g/ kg of seed tuber, application of boron<br />(0.2%) at 30 DAP, application of Mancozeb 75% WP @ 2.5 g/ l of water at 30 and 60 DAP as well as application of<br />either mixed formulation of Cymoxanil and Mancozeb (8%+64%) 72% WP @ 3 g/ l of water or sole application of<br />Dimethomorph 50 WP @ 1 g/ l of water at 45 and 75 DAP of potato. The results of economic analysis reveal that<br />highest net return as well as benefit cost ratio was also highest in Cymoxanil and Mancozeb based treatments<br />followed by Dimethomorph based treatments.

Keyword: Efficacy; IDM; Late blight; Potato, Yield; Economics