A collection of 86 isolates of Phoma lingam obtained from infected oil
seed rape (Brassica napus L.) plants from different geographical locat
ions in Poland has been studied by PCR and PFGE methods. The results s
how that the majority of isolates (95%) belonged to NA1 sub-group, whi
ch is regarded as less virulent to oilseed rape. Only 4 isolates (5%)
were classified as belonging to the virulent group.