Assessment of the Performance of Different Options of Integrated Management of Late Blight Disease on Yield of Potato in West Bengal

A. Banerjee, B. Sarkar, S. Mukherjee and F.H. Rahman


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

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