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Seed pieces from a single seed lot of potato cultivar Russet Burbank were diffusion. In Oregon, seven different serogroups were detected in irrigation planted at two production areas in Oregon and Colorado in 1985 and 1986. water first during the season, then on leaflets, and later in diseased stems. In Plots were established in fields irrigated from either surfaceor well-water Colorado, five different serogroups were detected in irrigation water before sources. Seed tubers, field soil, irrigation water, symptomless leaflets, and or at the same time they were detected on potato leaflets. However, only stems with aerial stem rot symptoms were assayed for the presence of soft one plant developed aerial stem rot symptoms. In Oregon, 39% of the rot erwinias. More than 95 and 90% of all strains recovered from Oregon serogroups identified were common to irrigation water, leaflets, and and Colorado sources, respectively, were Erwinia carotovora subsp. diseased stems, whereas in Colorado 50% of the serogroups identified were carotovora. A total of 3,556 strains of E. carotovora were tested common to irrigation water and leaflets. Contaminated water sources are a serologically against 21 different antisera by Ouchterlony agar double potential source of inoculum for aerial stem rot in Oregon.