Dudarjeva G. Root rots of winter and spring wheat, path of lowering of their development in Southern Steppe of Ukraine

The thesis is devoted to learning of features of creation of the complex of agents root rots, and also development of receptions their control. It is established installed, that main agents root rots winter and summer wheat are the fungi Bipolaris sorokiniana Sacc., Fusarium graminearum Schwabe, F. culmorum (W.G. Sm) Sacc., F. oxysporum Schlecht, F. gibbosum App. Et. Wr. emend Bilai, F. sambucinum Fuck.. var. minus Wr., F. avenaceum (Fr). Sacc., F. solani (Mart). App. Et Wr., F. moniliforme Sheld.; Pseudoсercosporella herpotrichoides (Fron) Defghton, Rhizoctonia cereals van der Hoeven and others. Dominating among them are Bipolaris sorokiniana and fungi from genus of Fusarium. The severity of by root rots spring varieties of wheat was much higher, than winter. Lowering abundance of root rots is detected at durating application without plough of the system of processing of ground against plough depending on the predecessor. The estimation of resistance of winter and spring varieties of wheat against agents of disease, their response on agrotechnics receptions, monitoring of plant sanitation was carried out. It was studied biological and economic efficiency of chemical application together with a growth regulator Mars - 1.