The virulence of the barley leaf rust pathogen in the North Caucasus in 2014-2017

Barley leaf rust caused by Puccinia hordei Otth. is a harmful disease of barley. If the crop is severely damaged, the yield loss may be of 20 to 80 %. Population studies of the pathogen abroad are actively conducted in countries for which protection against the disease is of particular importance (Australia, New Zealand, the United States, Europe, the countries of Northern Africa). This paper describes the North Caucasian P. hordei population virulence in 2014-2017 to 17 differentiator varieties and barley lines of international and Australian kits containing currently known pathogen resistance genes, shows. Winter barley leaves ( Hordeum vulgare L.) of different varieties affected by P. hordei which were collected during route surveys in 2014-2017 in the territory of the North Caucasus served as a biomaterial. The selection and reproduction of mono-pustule isolates was carried out according to the common procedure. Barley plants were grown hydroponically with the use of Knop’s nutrient solution...