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Epiphytic ability of nine of the P. syringae strains used in the virulence assays, measured as CFU counts per 10 leaf disks sampled. Given our accuracy cut offs of 5–50 colony counts in the methodology, the y-axis starts at the minimum CFU count we might see in our dilutions. The absolute minimum of 5 CFUs in an undiluted 5 μl droplet would equate to 10,000 CFUs in the 10 ml sample taken.
