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Quantitative comparison of the amounts of vessels with modified intervessel PMs in PD-susceptible (Chardonnay) and -resistant (U0505-01 and 89-0908) genotypes. Each genotype included both Xylella-infected vines and PBS-inoculated control vines. Each datum is presented with a mean and sd based on three replicates from three grapevines, respectively. Sixty-three to 88 vessels were observed for each replicate.
