Heretskyi R. Agrobiological and phytosanitary aspects esca spread control

The dissertation presents the results of the development of the agrobiological methods to reduce the symptoms of esca, improve agrobiological traits and increase the yield of diseased plants and limit the spread of the disease based on control of endophytic symptoms and DNA identification of pathogens on rootstocks. For the first time, the composition of a complex preparation based on EM-agro, calcium and magnesium salts were proposed to improve agrobiological and productivity traits of grapevine plants affected by esca, using DNA diagnostics methods, for the first time in Ukraine, species of fungi (Cadophora luteo-olivacea, Eutypa lata, Botryosphaeria dotnidea) involved in the development of the esca complex. The presence of esca endophytic lesion on rootstock varieties of Ukraine assortment was demonstrated, which, together with the established rate of increase in the number of diseased plants within the vineyard (up to 1.3% per year), determines the risks of diseases spreading with rootstock during the process of grapevine grafting. The additional strict sanitary control measures (selective endophytic lesions control) for the scheme of certified grapevine planting material manufacturing was proposed (the state of clones of rootstock grape varieties with. The influence of the year meteorological conditions primarily the amount of rainfalls in the previous growing season on the esca manifestation levels was shown. Corresponding between esca visual manifestation and polyphenols content was demonstrated, in particular, a lesser manifestation of symptoms corresponds to a greater concentration of flavonols, flavanones, flavones, anthocyanins, and a higher total content of polyphenols.