NEW SOURCE MATERIAL FOR WINTER WHEAT BREEDING FOR RESISTANCE TO DISEASES Luchna I. S. Plant Production Institute nd. a V. Ya. Yuryev of NAAS The results of immunological studies of winter wheat collection samples and hybrid families F 6 -F 8 on infectious and provocative backgrounds of the most common diseases were analyzed. Winter wheat, source material, resistance, sources, samples, lines, hybridization Introduction. Currently, due to the intensification of agricultural production

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... y status of agrocenoses of all field crops is significantly complicated. Because of maximum saturation of crop rotations with common pathogens, the accumulation of them is observed in soil, seeds, stubble, wild cereals. This motivates the search for new ways to organize plant protection, development of revolutionary new approaches to solving this problem. One of the most efficient, but complex ways, is creation of resistant varieties, the most adapted to specific environmental conditions. Resistant varieties, due to their self-protection properties, solve economic, social and environmental challenges arising from the powerful pesticide pressure [1, 2]. Breeding for resistance to diseaseis is is of immediate interest throughout the world because of economic and environmental factors. This is the most efficient and perfect, in terms of environmental protection, plant protection method. Recently, against the background of a rise in price of fungicides, on the one hand, and the ecological biosphere crisis, on the other hand, the search for new efficient sources of resistance to diseases and creation on this basis of new source material with group resistance to diseases [3, 4] take on enormous significance. Head smut, powdery mildew, leaf septoriosis, which under favorable conditions for their development can cause a significant loss in grain yield and quality deterioration of flour and bread remain the most harmful to winter wheat crops [5, 6] . In the Eastern Forest-Steppe of Ukraine, in particular the Kharkiv region, the greatest damage is caused by leaf spots (septoriosis, tan spot) and powdery mildew, appearing annually with varying degrees of disease development. For the last few years brown rust on winter wheat crops is not shown to a large extent. Purpose. To realize successfully scientific breeding programs, source material is essential. Therefore, the search for new sources of resistance to diseases, determination of their donor properties and creation on their basis of new source material with a complex of valuable features are the mainstream directions of research. Material and Methods. The study material was winter wheat collection samples and wheat lines F 6 -F 7 derived from previously identified sources of resistance. The samples were immunologically characterized in the infectious provocative nursery of scientific crop rotation at the Plant Production Institute nd. a V. Ya. Yuryev of NAAS of Ukraine. Sowing was carried out in the optimal time frame for the culture (for leaf diseases) and later (to provoke head smut infection in plants) with hand drills, on 3-5 rows, each 1 m long, with the row spacing of 15-20 cm and bare fallow as a predecessor. To create artificial infectious backgrounds of septoriosis (Septoria tritici Rob. et Desm, S. nodorum Berk.) and head smut (Tilletia caries Tul.) infective material gathered from soft winter wheat collection and breeding samples was used. Provocative backgrounds of brown leaf rust (Puccinia recondita f. sp., Tritici Rob. et Desm.) and powdery mildew (Blumeria graminis (DC) Speer.) were made by planting varieties-infection accumulators susceptible to diseases along  I. S. Luchna. 2014. ISSN 0582-5075. Selektsiia i nasinnytstvo. 2014. Vol 105.