Efficiency of LR-genes to the born ravain in breeding spring wheat in the conditions of the southeast of the Voronezh region

Issues related to the identification of sources of resistance to brown rust of spring wheat and monitoring (Puccinia triticina = Puccinia reconditа Rob.ex Desm. f.sp. tritici Erikss. et Henn.)of changes in the population of pathogens are considered. The results of monitoring the changes in the local population of brown rust with the help of curved lines of the Thatcher series are presented.