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Pierce's disease symptoms in grapevines. Cabernet sauvignon grapevines infected with the wild-type strain Temecula (A), the rpfF mutant KLN61 (B), or mock inoculated (C). Yellow arrows (A and B) indicate leaves with leaf scorch, an early disease symptom, and white arrows (B) indicate leaves that have detached at the blade-petiole junction, an advanced disease symptom.
