In vitro evaluation of six fungicides on radial mycelial growth and regrowth of Fusarium pallidoroseum isolated from castor (Ricinus communis ) in Samaru, Nigeria

Abstract

Six fungicides at three rates (1.5x, 1.0x and 0.5x mg a.i/ml) were evaluated on radial growth and and regrowth of mycelia of Fusarium pallidoroseum isolated from castor (Ricinus communis) in vitro.  It was observed that the fungicides (Benomyl, Benomyl + Thiram, Mancozeb, Metalaxyl-m + Thiomethoxan + Difenconazol, Tricyclazole and Carbendazim + Mancozeb) at all the concentrations tested inhibited mycelial growth and regrowth of the fungus. Benomyl, Benomyl + Thiram and Tricyclazole completely inhibited mycelia growth of fungus at 1.5x, 1.0x and 0.5x mg a.i/ml. Metalaxyl-m +Thiomethoxan + Difenconazole, Carbendazim + Mancozeb  partially inhibited  radial growth and re-growth of  mycelia only at 1.5x mg a.i/ml not at 1.0x and 0.5x mg a.i/ml.  Inhibitory effect of all the fungicides on mycelia growth and re-growth was greatest at 1.x5 mg a.i/ml.