Efficacy of Some Plant Extracts against Rhizoctonia Solani on Pea

Antifungal activity of ethanol-water extracts of four medicinal plants, cinnamon (Cinnamomum verum Presl.), anise (Pimpinella anisum L.), black seed (Nigella sativa L.) and clove (Syzygium aromaticum L. Merr. & Perry.) was investigated against pea (Pisum sativum L.) root-rot fungus Rhizoctonia solani. In vitro antifungal activity test shown a high growth inhibition at concentration (4%) of each plant extract. The highest antifungal activity was recorded for clove extract which causes complete growth inhibition at concentration of 1%. Efficacy of clove extract on disease incidence of Rhizoctonia root-rot of pea was investigated in the greenhouse pot experiment. Clove extract at concentration 4% as well as the chemical fungicide recorded highly significant increase in the percentage of survived plants (40 and 48%, respectively) and highly significant decrease in disease incidence.