The study was carried out Horticultural Research Station, Mondouri, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal on Onion cultivar Sukhsagar during the Rabi season of 2013-2014 and 2014-15. Onion (Allium cepa L.) is one of the oldest known and an important vegetable crop grown in India. The onions are regarded as a highly export oriented crop and earn valuable foreign exchange for the country. Though India produces a significant quantity of onions it is not regular and sufficient enough to meet the demands for both domestic requirement and export. The experiment was conducted in a randomized block design with three replications. The fungicides applied as foliar sprays along with sticker were Difenaconazole 25 EC (0.025%), Difenaconazole 25 EC (0.05%), Difenaconazole 25 EC (0.1%), Chlorothalonil (0.2%), Mancozeb 75 WP (0.25%), Copper oxychlororide (0.3%) and untreated control. Though the differences in disease controlling potential of these fungicides are marginal yet differences in the yield were quite pronounced, as sprays with Difenaconazole 25 EC (0.1%) resulted in greater yield increase than the other fungicides. Difenaconazole had earlier been reported to be quite effective in controlling purple blotch disease of onion and increase the bulb yield by Sastrahidayat. However, in the present study Difenaconazole 25 EC (0.1%) proved to be more promising in management of disease as well as increasing bulb yield.

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