Evaluation of potato varieties and hybrids on the resistance against black scab under conditions of Ukraine’s Polissia

Goal. Assess potato varieties and hybrids for resistance against rhizoctonia disease identify highly resistant varieties.
 Methods. The fundamental principle of the existing methodology evaluating is to test varieties, species potatoes on natural or artificial infectious backgrounds using a pure culture fungus Rhizoctonia solani Kuhn. grown in Petri dishes was introduced when tubers were planted soil. assessment degree damage stems carried out according underground organs plants, yield potatoes, then level variety samples determined by disease. Evaluation causative agent Kuhn nine-point scale, where score 9 — no tubers, 7 development up 10% (high resistance); 5 progression 11—25% (medium 3 26—50% (low resistance).
 Results. Based rhizoctonia, Dubravka, Vesta, Lugovska, Obriy, Serpanok, Yavir, Scarbnytsia, Tyras P.207.407 (Zov × Polisska Rozheva), 205.17-24 (Adretta 23-16s/73) others; medium-resistant (5 points) Chervona Ruta, Povin, Vodogray, Horlytsia, Zov, Cupava, Nadiyna, Belarossa, Olvia, Svitanok Kyivskyi, Ukrainska Rozheva, Beregynia, Charunka, Okolytsia, Slutch, P.210.14-23 Posvit), 211.20-31 (Prolisok Lugovska); susceptible 51, 32.9% tested Conclusions. We have proved that mid-early ripening early cultivars as well selection are more infected with black scab than mid-ripening, mid-late late cultivars. These relatively expedient use scab.