The present study was undertaken to study the effect of Ridomil against Fusarium solani causing rhizome rot of Zingiber officinale Rosc. This disease causes heavy economic loss of ginger, to control this disease Ridomil fungicide was tested against Fusarium solani and was found effective against Fusarium solani causing rhizome rot of Ginger. The fungicide Ridomil was tested at five concentrations i.e., 0.025, 0.05, 0.1, 0.15 and 0.2% in vitro against Fusarium solani. The result showed that 0.2% concentration of Ridomil was most effective in controlling the growth of Fusarium solani causing rhizome rot of ginger.