Effect of different concentrations of bio-fumigants against Pythium aphanidermatum causing soft rot disease of ginger

An investigation was carried out to study the effect of different concentrations of bio-fumigants against Pythium aphanidermatum in vitro and in vivo. In vitro test was carried out in the laboratory with three concentrations viz. 5, 10and 15 per cent of mustard, cabbage and radish of bio-fumigant. The effectiveness was found highest at 15 per cent concentration followed by 10 and 5 percent concentration in all bio-fumigants. Mycelium growth inhibition was recorded maximum in 15 percent concentration (44.02, 42.43 and 41.78%) followed by 10 percent (42.53, 41.04 and 41.04%) and 5 percent (38.79, 38.06 and 37.31%) in mustard, cabbage and radish at 6^th day after incubation, respectively. The pot experiments were carried out in net house with 0.5 kg, 1.0 kg and 1.5 kg per 5 kg soil pot⁻¹ of each bio-fumigant viz. mustard, cabbage and radish from June to February. The percent disease control was recorded highest in bio-fumigation with mustard (39.91) followed by cabbage (37.24) and radish (36.91) @ 1.5 kg in 5 kg soil pot⁻¹ over the control.