Suppressive Effect of Certain Composts on the Infection by Root-Rot and Wilt Diseases of Faba Bean under Greenhouse Conditions

Document Type : Original Article

Authors

Plant Pathol. Dept., Fac. Agric., Assiut Univ., Assiut, Egypt

Abstract

Supplemented composts Rich and Planta Rich, (CMs) to infested soil with the pathogens (Rhizoctonia solani and Fusarium subglutinans the causal of root-rot and F. oxysporum ; the causal of wilt ) at the rate of 10 gm/kg soil (Feddan = 1000 000 kg soil) caused high reduction in severity of both diseases compared with control (un-composted soil). Population density of Bacillus subtilis Pseudomonas fluorescens, Actinomycetes and certain fungi was increased by supplemented soil with Rich and Planta Rich CMs. The highest increase was detected in Actinomycetes population density followed by the other soil microflora. However population of fungi was the lowest. B. subtilis Pseudomonas fluorescens, Actinomycetes and certain fungi were isolated from both composts and proved to be antagonistic to the pathogenic fungi in vitro. Electrophoretic analysis of extracts of healthy and diseased faba bean plants grown in composted infested with the tested pathogens indicated that anew proteins (MW 23.3 KDa), two chitinase (Chit-1 and Chit-6), one peroxidase (PRX-5) and one estrase (ESt-4) isoforms which were induced by this treatment.

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