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Abstract: The namral incidence of wet bubble disease of white button mushroom was recorded to range from 1 to 100% in different farms in and around Solan and Bilaspur in Himachal Pradesh and Momi Hills in Haryana (India). Compost extract agar medium supported maximum growth of M perniciosa. Maximal spore formation was recorded on malt extract peptone dextrose agar medium. Maximal mycelial weight was observed in compost extract medium. A pH range of 5-6 was found optimal for the mycelial growth of M perniciosa All the strains of A. bisporus (U3, S-11,791, S-910) and A. bitorquis (NCB-6, NCB-13) were found susceptible under in vivo conditions. Loss in yield of A. bisporus (S-ll) varied from 15.72- 21.97%) and 65.62-80.13%) when the pathogen was inoculated at spawning and casing, respectively.
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