Effect of Plant Extracts and Biological control agents on Rhizoctonia solani Kuhn

Abstract

This study aims to examined antagonistic ability of some Plant Extracts and bio agents against of Rhizoctonia solani. The aqueous Extracts of plants used in study (Common Hornwort, Sage and Thorn apple) had against effect on the growth of pathogen in PSA medium. The Common Hornwort and Sage at rate 15% was superior inhibits fungal growth, it was 100.0 %. The results showed that alcoholic extract of plants (in concentrate 10 and 15%) was also effective and caused highly activity to inhibit radial growth of pathogen. In addition to the concentrates 1 and 5% were inhibited at rates 40.8-69.6% and 63.0-3838%. Thorn apple (Datura) extract was superior on Sage then Common Hornwort respectively. In the other hand the results appeared that Effective Microorganisms (EM-1) reduced growth of fungus more than organic fertilizer, Sea Bloom 29 which was 100.0% at both rates 10 and 15% whereas, the concentration 1 and 5% have inhibition influence which was 48.5 and 76.3% respectively. These results showed for the first time that ability of using the plant extracts and bioagents as alternative methods to control of the most serious plant pathogen and reduce using of chemicals and their problems.