Abstract
Genetic resistance is one of the best methods to control bacterial soft rot of potato tubers. However, an extensive description of resistance levels in currently registered cultivars is not available, as the literature contains only scattered reports. Using a half-tuber test, we therefore investigated the resistance to Pectobacterium atrosepticum of 93 potato cultivars registered on the French National List between 1935 and 1987, and 157 candidates for registration between 1987 and 1997. The relative ranking in a set of 11 control cultivars was stable over the 11 test years, with Ackersegen, Daresa and Bintje being the most susceptible and Kerpondy, Sirtema and Kaptah Vandel being the most resistant. Both registered and candidate cultivars showed a wide distribution of mean rot volumes six days after inoculation, irrespective of cultivar type (ware, starch, or firm-flesh). Mean resistance was significantly higher in recently bred than in older cultivars.
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