Nurmukhammedov A. Increasing Sugar Beet Resistance to Causative Agents of Rhizomania, Root Rots and Black Leg of Seedlings

Object - the character of cooperation of sugar beet and causal agents of rhizomania, root rot and black leg. Purpose - the improvement of protective measures by monitoring of diseases and introduction of new methods of increasing sugar beet resistance to the causal agents of rhizomania, root rot and black leg. Methods - phytopathological, mycological, virological, biotechnological, breeding, statistical. Novelty - monitoring of causative agents of rhizomania, root rot and black leg resulted to create the ways for increasing resistance of sugar beets by the field and biotechnological methods of evaluation, inducing of their resistance and statistical modeling. The morphology and the area of BNYVV and its vector Polymyxa betae were established in Ukraine. The effect of different factors on rhizomania spreading was studied. Evaluation of the breeding materials and search for new sources of resistance to BNYVV was carried out. It was established that the dominance of causal fungi in pathogenesis of black leg and root rot depends more on sugar beet development stage and on level of fungi aggressivity than on their number in the soil. New methods of evaluation of resistance to root rot under in vitro conditions and a technique of their field evaluation were worked out. A statistical model for selecting forms resistant to root rot was developed. A method for inducing of resistance by the phenolic compounds was worked out. Results of the researches - it is being used in a theory, practice and for study purposes process. Branch - plant production.