The pathogenic microflora on sunflower varieties seeds of the different reproductions produced in the central zone of Krasnodar region

The work was done at the Federal state budgetary scientific institution “All-Russian research institute of oil crops by the name of Pustovoit V.S.” in 2012-2014. The purpose of the research was to study seeds of sunflower varieties of the different reproduction for presence of pathogenic microflora. There were used breeders seeds from reproductive plots, foundation seeds, registered and certified seeds of sunflower varieties Buzuluk, R-453, SUR, SPK, Lakomka and Oreshek produced in the central zone of the Krasnodar region. Selection of seeds samples was done due to the State Standard 12036, a composition of the pathogenic microflora was analyzed by Naumova’s method (1970). The results showed that seeds of the studied sunflower varieties were infected with fungi of Alternaria Nees. species on 12-39% and bacterial microflora - on 6-26%. Unimportant amounts of the other pathogens such as fungi of Fusarium sp.u Rhizopus sp. species were noted: 0-1 and 0-3% for oil varieties Buzuluk, R-453, SUR, and 1-7 and 2-14 % for confectionary varieties SPK, Lakomka and Oreshek, respectively. Sclerotinia и Phomopsis species being the most dangerous pathogens were not observed. Composition and proportion of the main pathogens on seeds of all reproductions, from breeders to certified seeds, were almost invariable.