Journal of Pure and Applied MicrobiologyVol. 8 No. Special Edition Nov. 2014

Suppression of the Cotton Seedlings Pathogen; Rhizoctonia solani by Some Plant Extracts

Abd El-Rahim M.A. El-Samawaty1,2, Mohamed A. Yassin1,2*, Mohamed A. Moslem1 and Moawad R. Omar2

1Botany and Microbiology Department, Faculty of Science, King Saud University, Riyadh, Saudi Arabia. 2Agricultural Research Center, Plant Pathology Research Institute, Giza, Egypt.

Received on 10 September 2014 and accepted on 23 October 2014



Cinnamon (Cinnamomum zeylanicum), clove (Syzygium aromaticum), garlic (Allium sativum) and ginger (Zingiber officinale) extracts were in vitro evaluated against eight Rhizoctonia solani anastomosis groups AGs causing cotton seedlings damping-off. Experimental results were statistically analyzed and the least significant difference was used to compare means. Both of the clove and garlic extracts were significantly suppressed the growth of all tested R. solani AGs but the other two extracts were ineffective. The effectiveness of both clove and garlic extracts were increased as the concentration increase. The potency of such extracts were varied depending on the concentrations and R. solani AGs. All tested R. solani AGs were completely inhibited at the 1.6 % concentration of clove extract. Both of the clove and garlic could be promising as sources of natural eco-friendly phyto-fungicidal compounds for in vivo applications.

Keywords : Medicinal plants, Phytopathogens, Fungicide, Disease control.