Feshchuk O. Silver scab of potato and events limiting its development in a Woodlands of Ukraine

The thesis presents the results of research on the pathogen, the degree of destruction and the proliferation of methods of controlling the disease. An action against the disease, the rules and terms of the chemical and biological agents. Silver scab of potato (pathogen – the fungus Helminthosporium solani Durieu & Mont.) distributed throughout the zone Polissya Ukraine and affects plants at all stages of ontogeny, a special exhibits harm during the storage of potatoes. Optimal conditions for disease manifestation up at 18–22 °C, 90–95 % humidity and pH 5.5–6.5. Helminthosporium solani Durieu & Mont. fungus directly affects the growth and development of potato – reduces germination, inhibits the development of potato plants, tubers reduces yield quality and reduces their productivity. The source of infection silver scab can be as sick seed tubers and soil containing infection. Development silver scab linked to weather conditions during the growing season and storage of potatoes. Possible manifestations of latent forms of the disease. Scab silver is the primary disease that contributes to infection of tubers by other more aggressive pathogens - bacteria and fungus Pectobacterium carotovorum Gardan, Fusarium oxysporum Snyder & Hansen; crop losses reach 28 %. The largest increase yields and provide drugs Prestige Fitodoktor – respectively 19.6 and 10.8 %.