in the form of unripe fruiting bodies in infected fallen leaves or in lesions on twigs. These unripe fruiting bodies, or pseudothecia ripen in winter
the name gummy stem blight. On the lesions, black specks, the new fruiting bodies with spores, become visible. On the leaves, round and extending…
the centre of the lesions, light-coloured translucent pycnidia (fruiting bodies) with new spores occur. The lesions may merge, turning the whole leaf…
become yellow-brown to black and ultimately die. Black lesions with fruiting bodies occur more commonly at temperatures of approximately 20 °C whereas…
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