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Trees with differing intensities of Cryptococcus fagisuga infestation were wound-inoculated with Nectria coccinea and it was found that the size of the resulting lesions was related to the severity of infestation, an effect not connected with the provision of stylet-holes or fissures through which natural infection may occur. This finding, together with observations of lesion development on trees affected by a recent severe drought and on nutritionally deficient trees, indicates that stress in the host can enable N. coccinea, a weak parasite, to cause extensive bark necrosis. It is suggested that the existence of different sources of stress may be responsible for the contradictory views on the aetiology of beech bark disease.

Nectria coccinea infection of beech bark : variations in disease in relation to predisposing factors