The infection biology of Armillariella me/lea in young pine seedlings is described. E idence supports the view that the bending of seedlings by snow in winter may be one of the main primary causes for the infection of root system& by rhizomorphs. In spruces, infection may take place from the soils by rhizomorphs, as well as from air by spores, or from stumps via root grafts. The external appearance of spruces suffering from heart rot is discussed.
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Veikko Hintikka (1974) studied this question.
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