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Abstract: The methods of spore dispersal of Verticillium malthousei are discussed. V. malthousei survives for at least twelve months in peat-limestone mixture and in soil. Spores in soil are subject to soil mycostasis, which it is suggested is due to a microbially induced deficiency of essential nutrients. Inhibition of germination is overcome in the presence of mushroom hyphae, when spores are stimulated to germinate and grow. Infection experiments showed that conidia mixed in the casing gave maximum infection, which occurred independently of the position of the spores within the casing. It appears that V. malthousei spores germinate and grow in close association with mushroom strands in the casing, producing no recognizable malformity at this stage. Disease symptoms and sporulation of the pathogen are confined to the mushroom initials and later stages.
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