IMPACT OF SELECTED FUNGICIDES ON FUSARIUM PALLIDOROSEUM SPORULATION IN CASTOR FIELDS OF SAMARU, NIGERIA

Abstract

Six fungicides at three rates i.e. one and half, one and half of recommended rates (1.5x, 1.0x and 0.5x mg a.i/ml) were evaluated on the spores of Fusarium pallidoroseum isolated from castor (Ricinus communis) in vitro. It was observed that the fungicides (Benomyl, Benomyl + Thiram, Mancozeb, Metalaxyl-M + Thiomethoxan + Difenoconazole, Tricyclazole and Carbendazim + Mancozeb) at all the concentrations tested it inhibited sporulation of the fungus. Benomyl, Benomyl + Thiram and Tricyclazole completely inhibited sporulation at 1.5x, 1.0x and 0.5x mg a.i/ml. Metalaxyl-M + Thiomethoxan + Difenoconazole, Carbendazim + Mancozeb partially inhibited sporulation only at 1.5x mg a.i/ml, not at 1.0x and 0.5x mg a.i/ml. The inhibitory effect of all the fungicides on sporulation was greatest at 1.5x mg a.i/ml.