Abstract
The expression of foliar and tuber bacterial ring rot (BRR) symptoms in 108 cultivated potato genotypes inoculated withClavibacter michiganensis subsp.sepedonicum was examined in field experiments during 1986 to 1996. Considerable variation in the incidence of foliar BRR symptoms was observed in all plant cultivars, ranging from no detectable symptoms to complete necrosis of the leaves. Similar variability was observed in the incidence of tuber BRR symptoms, and severity of tuber symptoms ranged from no detected symptoms to complete breakdown of the vascular ring that extended throughout the tuber. A decline in the incidence and severity of tuber, but not foliar symptoms, was observed in the later years of the study (P 0.05) when tuber symptoms declined. Strong correlations were observed between the incidence and severity of foliar BRR symptoms (r=0.41, P<0.01) and between the incidence and severity of tuber BRR symptoms (r=0.96, P<0.001). During the 11 year period, no BRR symptoms were observed in 2,620 uninoculated control plants.
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