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Abstract: A fungicide resistant Cladobotryum mycophilum isolate was introduced into a mushroom crop and the air spore-load within the cropping house monitored using a Burkard seven-day volumetric spore trap. A detailed log of personnel movements and cropping operations was also kept throughout the cropping period. Conidial release was shown to be sporadic with the vast majority of conidia being released when physical disturbance of the diseased area occurred. The greatest disease disturbances resulted from water splash during crop watering and salting - a technique used to kill disease colonies. Low numbers of conidia were released prior to the first flush and caused spotting of 21% of first flush mushrooms. High numbers of conidia were released during the interflush period resulting in total loss of the second flush through spotting. A greater understanding of cobweb disease epidemiology is therefore required before more appropriate hygiene practices can be developed.
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