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Abstract: Of the 223 samples examined Hypomyces rosellus, Fusarium moniliformae, Mycogone perniciosa, Trichoderma sp., Vertcillium fungicola and Sepedonium chrysosporium were found in most of the samples. The pathogens M. perniciosa and H. rosellus proved to be detrimental causing 95.65 to 100% and 61.0 to 72.06% loss in yield, respectively, when inoculated in casing. Significantly higher yields were recorded when Sporgon (0.075%) was added in casing against M. perniciosa and V. fungicola. Bavistin (0.075%) was most effective against Trichoderma. While Bavistin (0.025%)+formalin (0.20%) was effective in terms of yield against H. rosellus, F. moniliformae and S. chrysosporium when applied in casing. Five bacterial isolates were selected on the basis of their ineffectiveness to A. bisporus and designated as BI (Bacterial Isolates) I, II, III, IV and V. All of these isolates were effective against V. fungicola and F. moniliformae while BI 1,11 and V were found to be effective against M. perniciosa and S. chrysosporium. Trichoderma was controlled by BI III. The isolates selected against pathogens in in-vitro smdies were further inoculated in the casing. It was found that BI I against Sepedonium and Mycogone and BI III against Trichoderma were effective in terms of yield.
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