Relation of aspen root size to infection by Ganoderma applanatum

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Abstract
Ganoderma applanatum (Wallr.) Pat. infected only root segments larger than 2.5 in. diam (in the laboratory) and competed very effectively with non-hymenomycetes in large roots in the laboratory but died out in their presence in small roots. Infection in the forest was restricted to within 2.5 ft of infected stumps when roots at the stumps were less than 2.5 in. diam.It is proposed that root rot centers may be more prevalent on the good aspen sites because roots become larger earlier than on poor sites.

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