Pathogen (fungus) of the grapevine disease anthracnose; see there.
This rather rare vine disease is caused by the fungus Elsinoe ampelina. The symptoms are grey spots with a black centre on the shoots, deeply sunken into the bark. The spots can also be seen on leaves and berries. On the leaves they are outlined in black, the dead tissue later falls out and this results in characteristic small holes as if shot through...
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Thorsten Rahn
Restaurantleiter, Sommelier, Weindozent und Autor; Dresden