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vitis coignetiae problem
A 10 year old Vitis C on a South West facing barn died suddenly over the last two weeks . Noted leaves started wilting near one of the main lateral branches (it is trained as an espalier) and over two weeks spread to whole plant. The leaves became totally desiccated. Not short of water. on cutting off one of the 'arms' of the espalier there was a dark brown core to the stem with apparently healthey sap wood. Did not commence wilt from the tips of the branches but from leaves close to the main vertical stem. Any ideas?
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