Fedorchuk S. Optimization of potato protection against Phytophthora infestans and Alternaria solani in the zone of Polissya in Ukraine

The dissertation thesis is devoted to the study of biological characteristics, development and distribution of late blight and alternaria on different resistance to potato varieties in the Polissya area of Ukraine, as well as the development of effective protection measures by combining and sharing fungicides, biological agents and plant growth regulators. It has been established that according to the classification of potato varieties of foreign selection, namely Germany, in the group of early and middle-aged ones with low resistance to latex from ten varieties, there are Talent and Phasan (index 4.8), four varieties of medium stability (Finca, Evelina, Grenada, Pyrrole (index 5.7–6.4), three varieties with relative resistance (Bonus, Viena, Miranda (index 7.5–7.9) and the Gala variety showed a high resistance – index 8.6. As a result of the research, 12 resistant varieties from the group of early and middle-aged and 12 varieties from the middle and late-thirty out of 60 studied were found. The majority of resistant varieties of domestic breeding varieties – 15 varieties, and foreign – 9 varieties. As a result of the use of chemical pesticides, the largest increase in potato crop was achieved in comparison with other preparations, where the best crop was 34.8 t/ha for the variety the Bonus was obtained in the variant using the Anthracole prepuberum. It was determined that the highest efficacy against Ph. infestans (Mont) de Bary and Al. solani (Ell. et Mart.) potatoes had drugs with co-administration: (Gumysol, p. (1 l/t) + Anthracol, p (0.75 kg/ha) and Biological descendants close to efficiency (Gumysol, p. (1 l/t) + Phytosporin-M, p. (1.5 kg/ha) with additional cost recovery, respectively 1.6 and 1.9 times.