The Effect of Alcoholic Extract of Silybum Marianum Leaves Against Some of Rhizoctonia Solani Strains

The antifungal activity of ethanol extract of Silybum marianum was investigated invitro against three strains of Rhizoctonia solani at different concentrations (5, 10, 15 and 20%). Bioassay of extract was conducted by poisoned food technique with three replications. The findings showed that strain of R. solani (Eggplant) was susceptible to concentrations of S. marianum more than other strains in mycelial growth and inhibition percentage of fungal growth (3.9 cm, 56.4%) respectively whereas means of concentrations resulted to reduce the fungal growth gradually with increase concentration of S. marianum (5.7, 4.4, 4.3 and 1.6 cm) for concentrations of (5, 10, 15 and 20%) respectively, A concentration of 20% was recorded maximum of inhibition percentage of mycelial growth of R. solani strains 82.2% followed by concentrations of 15, 10 and 5% that recorded 52.2, 50.3 and 36.2% respectively. The interaction between concentrations of S. marianum with strains of R. solani was showed significantly differences between them in mycelial growth and inhibition percentage of fungal growth for all R. solani strains.