Efficacy of some fungicides and oil cake extracts against basal rot of onion caused by Fusarium oxysporum

Onion (Allium cepa L) isone of the most important vegetable cumcondiment crops of family Alliaceae grown inall parts of India. Fusarium wilt, an economically significant disease caused by Fusarium oxysporum has been causing major yield loss in the most onion cultivating regions of the world. The main objective of the present study was to assess the efficacy of ten different fungicides viz carbendazim, benomyl, tebuconazole, hexaconazole, mancozeb (63%) + carbendazim (12%), mancozeb, captan, copper oxychloride, zineb (64%) + (hexaconzole 4%) and trifloxystrobin (25%) + tebuconazole (50%) each at four different concentrations (500, 1000, 1500 and 2000 ppm) and oil cake extracts of neem, mahua, groundnut, mustard, pungam, castor and gingelly at 10 per cent concentration against linear colony of the fungus F oxysporum. Carbendazim, mancozeb (63%) + carbendazim (12%) and mancozeb were found to be the most effective with complete inhibition of mycelial growth of the fungus at 500, 1000, 1500 and 2000 ppmfollowed bytrifloxystrobin(25%) + tebuconazole(50%). Amongthe oil cake extracts neem was found the most effective in inhibiting the mycelial growth of F oxysporum followed by mustard.