The study of Fagopyrum tataricum Gaertn collection in terms of complex diseases for further breeding work to create high-yield and resistant varieties shows that the most resistant to the disease were complex samples originating from the Netherlands (5162) and were 3.6% and Italy (5134) – 4.3 %. There has been determined Phytopathological score of Fagopyrum tataricum Gaertn collection, which can serve as a basis for breeding to create high yield and resistant varieties of Tatar buckwheat disease.

Among the cereal crops that are grown in our country buckwheat occupies an important place. Buckwheat production currently does not ensure the needs of the population, and its yield due to diseases remain relatively high and not stable. Phytopathological research on buckwheat discovered various diseases that cause bacterial, fungi and viral infections. Common buckwheat has a number of features that hampers significantly its cultivation due to low fruit formed under intense colors, while passing several phases of ontogeny (growth, flowering, fruit formation), relatively poor development and the rapid growth of the root system and susceptibility to diseases and pests.

Selection work is often associated with attempts to combine valuable features of cultivated plants and their wild relatives in one organism. However, the most desirable results in the selection are obtained using wild relatives as donors of resistance to the most harmful diseases.

According to some authors, the nature of buckwheat plants can be improved by its crossing with wild relatives.

Fagopyrum tataricum Gaertn closest species in the genus Fagopyrum Mill is Fagopyrum esculentum Moench. It is used in the selection process in order to improve existing varieties of buckwheat biology course as biological sources of flavonoids and protein. Buckwheat Tatar self-pollinating annual plant of Polygonaceae family, which is widely cultivated in many countries as food cereals and flour of medical purposes.

To create high-yielding varieties of buckwheat is important to know the stability of the complex disease during ontogenesis. Therefore, the aim of our study is to identify promising Fagopyrum tataricum Gaertn resistant to pathogens.

As a result of the research the following pathogens were identifyied in the field: viral infection (viral burn buckwheat), gray mold (Botrytis cinerea Fr.), Fusarium (Fusarium heterosporum), bacteriosis (Pseudomonas syringae), kladosporioz (Cladosporium herbarum Lr.). Resistant to complex diseases appeared to samples originating from the Netherlands (5162) infestation was 3.6% and Italy (5134) – 4.3%.

Sample virus originating from India (5137) and Latvia (5138) in the field did not buckwheat affect. The sample originating from China was most affected by the virus (5105) and amounted to 53.5%.

Tatar buckwheat plants originating from the Netherlands (5162) showed the largest field resistance to gray rot. The highest infestation with gray rot was observed in Tatar buckwheat plants originating in Latvia (5138) and reached 37.5%.

Fusarium affection reached 30.9% in the samples originating from France (5128). Bacteriosis most affected plants appeared Fagopyrum tataricum Gaertn originating in Latvia (5138) and was 60%. Plants originating in Canada (5119, 5120), does not urazhuvalys bacteriosis. Kladosporiozom plants studied collection urazhuvalys slightly.

Of special note on sources of resistance to the virus burn buckwheat deserve phylogenetically related species: Fagopyrum tataricum ssp. Potanini Batalin, Fagopyrum cymosum Meisn, Fagopyrum giganteum Krot, Fagopyrum Ohnishi, Fagopyrum galiantum Ohnishi, Fagopyrum esculentum Moench ssp. ancestrale Ohnishi, Fagopyrum homotropicum Ohnishi, Fagopyrum statice H. Gross., Fagopyrum gracilipes, Fagopyrum pleoramosum Ohnishi, Fagopyrum sapillatum Ohnishi. It is noted that in the field they do not саuse buckwheat affection.

Thus, there has been defined Fagopyrum tataricum Gaertn Phytopathological score collection, which can serve as a basis for breeding to create high yield and disease resistant varieties Tatar buckwheat.

Key words: buckwheat, diseases, phytopatological research, Fagopyrum tataricum Gaertn.