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Pierce's disease symptoms in grapevines. Grapevines (cv. Thompson seedless) were inoculated with the wild type (A), TAM22 (B), TAM132 (C), TAM105 (D), TAM91 (E), or a PBS control (F). For each sample tested, three individual plants were inoculated. Pictures were taken 16 weeks after inoculation, and representative plants are shown.
