Sterlikova O. Formation of pathogenic fungi population under the influence of plants of different cucumber varieties and hybrids in agrophytocenoses.

The thesis presents the results of studies that substantiate the reasonability of cucumber varieties and hybrids assessment as an environmental factor of pathogenic fungi population formation in agrophytocenoses that makes it possible to solve the problem of control the necrotrophic phytopathogenic myxomycetes population - environmental factor of phytopathogenic background. Determined that the varieties and hybrids of cucumber plants, whose physiological biochemical properties constrain the intensity sporogonic pathogenic fungi, are able to reduce their phytotoxic activity. It is developed the methodology of different cucumber varieties and hybrids assessment on influence on the intensity of spore formation of phytopathogenic fungi. It ensures the distribution of plants varieties and hybrids on the effect on reproductive ability of phytopathogenic micromycetes. Determined that the varieties and hybrids of cucumber, which by their physiological and biochemical properties constrain the intensity of spore formation of phytopathogenic fungi, are able to reduce their phytotoxic activity. Plants of different cucumber varieties and hybrids exert selective pressure on fungi population, and significantly effect on their reproductive ability. Important factors are exometabolites, endophytic microflora and physiological and biochemical substances. It is roved the role of cucumber plants of various selective origin in the formation of fungal phytopathogenic background.