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(A) Grapevine showing tiger-stripe leaf symptoms associated with the chronic form of Esca. (B) Longitudinal section of an Esca-infected grapevine. Note the large area occupied by necrotic tissue (NT) and white rot (WR). (C) Longitudinal section of an asymptomatic grapevine in which most of the tissue is non-necrotic (NNT).
