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Abstract
A plating method was used to determine the prevalence of various Erwinia-species in samples of seed tubers from 82 different basic seed lots grown in northern Sweden. E. carotovora subsp. atroseptica (Eca) was by far the most prevalent species. In contrast, E. carotovora subsp. carotovora (Ecc) was found at very low levels in a few samples while E. chrysanthemi, (Echr) was not detected in any samples. Screening for Eca was carried out using biochemical tests as well as serological analysis (ELISA). There was a very good correlation between the two methods. Furthermore three deviant serogroups of Eca were detected. Their incidence was high in three seed lots but low in all the rest. The potential for using routine serological tests in the screening of seed lots for Eca is discussed.