Inhibition Activity of Mycorrhizal Fungi Glomus mosseae and G. intradicas with Trichderma harizanum Against Rhizoctonia solani in Okra Plant Abelmoschus esculentus (L.)

Abstract

The agricultural production processes currently targeted reducing chemical fungicides usage and increasing bio-agent application through controlling diseases alone or integrating it with other factors. The study aimed to investigate the induction of systemic resistance by multi bio-agents represented by mycorrhizal fungi Glomus mosseae, G. intradicas and Trichoderma harizanum against pathogenic fungus Rhizoctonia solani which caused wilt disease and growth defoliation to Okra seedling. Three isolate of R. solani were recorded on root of Okra seedling, named (local - Batra). Isolate no. (3) was more virulence than other isolates in damping off disease in the pre and post emergence. Results also showed that G. mosseae and G. intradicas with T. harizanum had a positive influence in reducing detrimental effect of R. solani in all growth parameters (e.g. fresh and dry weight of root) on disease severity on Okra plant caused by R. solani. Bio-agents (G. mosseae,G. intradicas and T. harizanum) increased resistance in Okra plants by raising production of enzymescatalase and Peroxidase.this experiment was revealed that using a complex of bio-agent’s factors were greatly increase the efficiency of biological control than using each of them individually. We conclude that the broad diversity of rhizosphere micro-organisms as well as the confronting between the bio-chemical and physical changes could be reflected the variations in the metabolic secondary products that could inhibit pathogens.