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Abstract: A large number of mesophilic fungi including Sepedonium maheshwarianum, Trichoderma viride, Fusarium acuminatum, Stachybotrys atra, Cladobotryum dendroides, Chaetomium indicum and Verticillium fungicola were isolated from Agaricus bisporus compost at its various stages of preparation. Out of these S. atra and S. maheshwarianum were reported to cause severe crop losses specially under low and high N levels when chicken manure was used as one of the ingredients (Vijay et al. 1997). In order to assess damage done by these fiingi, an experiment was planned where inoculum of above fungi was introduced in the prepared compost during different intervals and findings there on are reported in this communication. Data so obtained indicated 5 to 51% reduction in yield of A. bisporus when these fimgi were inoculated in the compost at spawning and 5, 10 and 15 days after spawning. Very heavy reduction in yield was observed when these fungi were introduced in the compost 5 to 15 days prior to spawning. At spawning highest reduction in yield was observed in case of C. indicum followed by F. acuminatum and least by S. maheshwarianum. Above smdies also indicated that S. atra and S. maheshwarianum whose incidence is reported at 0.5, 1.0 and 2.0, 2.5 N respectively (Vijay et al.1997) can become severe competitors if artificially inoculated in the selective compost (1.5 N).
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