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Abstract: Symptoms resulting from infection of mushroom sporophores by M perniciosa were recorded after inoculation of the compost and casing at various stages in crop development. The average time for symptom production was thirteen days after inoculation although infection was sometimes found at the base of the stipe in a much shorter time. Up to 31% of apparently healthy sporophores were found to be infected by M. permciosa at the base of the stipe Inoculation soon after casing gave the highest incidence of the disease, the amount decreasing steadily with subsequent inoculations. Inoculation of the compost before casing resulted in little or no disease. Spread from a point source inoculation was studied and found to be insignificant. In one experiment some spore dispersal occurred m a wind tunnel with an air movement of 500 ft per minute. By far the greatest amount of spore dispersal occurred in excess run-off from infested boxes. Formalin and mancozeb were used to treat artificially infested casing. Formalin at two concentrations gave complete control but also inhibited crop development at the highest level used Mancozeb was only partially successful.
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