vine disease caused by a fungus, Fomes ignarius . Infections of this fungus occur from pruning wounds or, more unusually, and probe. The fungus grows in the wood, within the strain, causing browning and cavities. In particularly serious cases, the esca can cause gradual deterioration of dieback on the berries and leaves. Is prevented by making the pruning cuts at an angle so as to avoid the stagnation of rain water making it easier to scroll.
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