Nemerytska L. The causals of the mixed potato rots and limitation measures of their spreading under the Ukrainian Polissya conditions

Agents of mixed potato rot and measures aimed at the limitation of its development in Ukrainian Polissya were the test object. The purpose of the investigation was studying the spread, harmfulness and bialogy of the bacic disease agents which participate in pathogenesis of mixed rot of Erwinia, Fusarium, Phoma, Phytophthora, Bacillus, Pseudomonas genera and of D. destructor nematode individuals. The interrelation between bacteria and phytohelminths has been investigated and seed selection measures for potato protection against them in Ukrainian Polissya have been improved. The methods used are laboratory, laboratory-and-field and field ones. The scientific novelty of the principles and conclusions lies in specifying the area, harfulness, species composition and in identifying mixed rot agents. Fifteen pathogene varieties have been determined on the basis of phytopathological examination. The basic components of the mixture of stimulator water solutions for activating the manifestation of the latent form of fungous, bacterial and nematode origin diseases have been selected, potato cultivars relatively resistant against mixed rot which are expedient to be used as initial forms in selection have been chosen. The application, seed selection and microbialogical research institutions. spheres are agricultural production.