Abstract
The fungus Rhizoctonia solani was isolated from rice, this fungus causes many diseases for plant and crops damage. To control this fungus by a safe method without causing any damage to environment, animal and human, we prefer using the alcoholic extract of some plants. The effect of alcoholic extract for leaves of Cassia spp., Salvia officinalis and Achillea millefolium was tested by using four concentrations for each extract 5,10,15,20 mg /ml these results were compared with antifungal Trichoderma harzianum and Trichoderma viride and it was noticed that these extracts have a high inhibiting effect against this fungus. The percentage of inhibition was 100% for all extracts and all concentrations that used in this study except the concentration 5 mg / ml of alcoholic extract for the leaf of Cassia spp. the percentage of inhibition was 90.3%. This proves that the alcoholic extract of the leaves has a high ability for inhibition similar to the biocontrol agent that was used.