Azarkov O. Biological substantiation of a mean of decrease in infectious potential of originators of withering of an apple of love of sort Fusarium Link ex Fr., in film hothouses in Forest-Steppe zone of Ukraine

The thesis is dedicated to the study of biological peculiarities of Fusarium Link ex Fr. genus fungi, their role in etiology and pathogenesis of tomato wilt diseases under conditions of film greenhouses. Their phylogenetic, organotropic and ontogenetical specialization has been investigated. From seven isolated species of fusarial wilt causal the species F. oxysporum f. sp. lycopersici had the wide organotropic specialization bound up with the ability to affect all the organs of a plant; (root, stem, leaves, clusters and fruits). The ability to affect the root system and stein was in species F. oxysporum f. sp. racticis - lycopersici, F. avenaceum and F. semitectum, particular specialization (ability to affect separate organs) was in F. solani, F. oxysporum f. sp. vasinfectum and F. moniliforme. It is determined that only species of fungi Fusarium oxysporum f.sp. lycopersici, F. solani and F. oxysporum f. sp. radicis-lycopersici have the high ontogenetical ability to affect on a mass scale plants beginning from a phase of seedling and to the end of vegetation. There has been worked out the system of tomato biological protection against wilt in film greenhouses, which includes plants treatment by the tank mixture of the microbiological preparation Micosan N and growth a regulating preparation Emistym S in the phase of 3-4 true leaves-(one time) and during vegetation (thrice). Production use of this system allowed to reduce the degree of plants damage by wilt disease by 22 %, to increase the yield on 5,1 kg/m2 and to obtain additional profit at the level 4,67 Hr/m2.