Pathogenic microflora of sunflower seeds from different areas of hybrid seed growing in the Russian Federation

The researches were carried out at the central experimental station of VNIIMK in 2010-2012. The material for experiment were 68 seed lots of the first generation of sunflower hybrids Kubansky 930, Jupiter, Mercury, Avangard, Altair, and Prizyor, grown in specialized seed farms of the Krasnodar, Rostov, Voronezh, Volgograd and Saratov regions. The composition analysis of pathogenic microflora was conducted in the laboratory of immunity and electrophoresis of the department of hybrid sunflower breeding. It was determined that in all studied seed lots from different regions of Russia the pathogenic microflora is mainly represented by the Alternaria and bacteriosis pathogens. The pathogens of dry rot, Fusarium, white rot and Phomopsis are present in a significantly lesser degree. During three years the seed lots from the specialized seed farms of the Krasnodar and Rostov regions were free from the infectious source of the most dangerous diseases: sclerotinia and Phompsis. It indicates that currently these areas are the most suitable for seed growing of sunflower hybrids.