The susceptibility to soft rot caused by Erwinia carotovora subsp. atr
oseptica of five potato cultivars and potato clones from the potato br
eeding programme at Jogeva Plant Breeding Institute was assessed in a
laboratory test. Three test methods were used: a single site inoculati
on, vacuum infiltration and slice inoculation. The severity of the dis
ease varied widely with the different methods, which gave different cu
ltivar rankings.