[Antigenic composition of Pseudomonas lupini strains isolated in 1963 and 2002 years].

The serological grouping of 17 Pseudomonas lupini strains, which were isolated from the affected lupin tissues in 2002 in the Kyiv region, have been studied for the first time. The natural pathogen's population has been shown to be serologically heterogeneous. The investigated Pseudomonas lupini strains according to a set of specific antigenic epitopes belong to two serological groups I and III. The Pseudomonas lupini strains related to the serological group III are most frequent (88 %) than the strains belonging to the serological group I (12 %). The reduction of serogroup's quantity from four in 1963 to two in 2002 in pathogen's population, perhaps, has been determined by the environment modification and cultivation of new lupin varieties.