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affected bed affected sporophores agar AGRICULTURAL EXPERIMENT STATION bacteria barrier beds infested beds loaded causal agent caves chemicals compost from affected cream types cream variety cultivated mushroom development of rhizomorphs disease appeared disease area disease occurs diseased mushrooms diseased sporophores feet in advance ﬁlled ﬁltered ﬁrst break formaldehyde fungi Fusarium growth infested beds infested soil infested to normal longitudinal sections mercuric chloride MISSOURI AGRICULTURAL EXPERIMENT mummy disease normal beds normal mushrooms normal sporophores numerous pathogen phores pileus placed in normal Pyroligneous acid recased RESEARCH BULLETIN 358 samples of soil sealed and stored small beds soil and compost soil or compost soil removed spawn species spongy sporo spread readily tier tilted pilei transmission transmit the disease trenches V V V V V V V V V VVVV VVVVV weeks white varieties