Influence of pollinators and growth regulators on the development of potato alternaria in the conditions of the Polissya of Ukraine

Goal. Evaluate the effectiveness of different schemes with the use of isolates and growth promoters separately and in a mixture on different potato varieties on an artificial infectious background of Alternaria spр. Methods. Field research, small-town. Monitoring the development of alternaria in the vegetative period of potato plants, and the main diseases of the tubers – during the storage of the crop, in accordance with generally accepted methods. The studied varieties – foreign selection  (Carlene, Gala and Riviera). The scheme of the experiment included 9 options: 1- control; 2- Poteitin; 3- Simpto; 4. Masterpiece; 5- Ass-Selective; 6th Masterpiece + Simpto; 7- Masterpiece + Poteitin; 8- Ass-Selective + Simpto; 9- Ac-Selective + Poteitin. Results. During the years of research, the varieties of Gal and Riviera were less affected by alternatives than the Carlene variety. It was established that the treatment of potato tubers before planting under the combination of the preparations Ac-Selectiv + Simpto increased resistance to alternaria and had a positive effect on all investigated varieties of potatoes, the disease developed from 5,1 to 5,6%, and the distribution from 20,6 to 30,2%. It was found that potato tubers of the Galа and Riviera varieties in all investigated variants during the harvest were affected by fusariosis (the disease developed from 1,86 to 3,24%) and parasley common (the disease developed from 0,94 to 3,24%). Potato varieties of Carlena variety were affected by fusariosis, common scab, rhizotoniosis and alternaria. Diseases of Fusariosis and Alternaria have affected tubers in all treatments and controls. The defeat of tubers with fusariosis was 1,88 to 3,24%. The defeat of parasites was from 0,91 to 1,64%. Defeat of tubers by diseases of rhizoctoniosis and alternaria was observed in the variants of the experiment: control, Poteitin, Simpto, Masterpiece and Ass-Selective. Defeat by rhizotoniosis was in the range from 0.50 to 0,90%, alternatively – from 0,50 to 1,0%. The same chemists in combination with growth regulators appeared to be more effective for the Carlene variety, and there were no rhizoctoniosis and alternariae. Conclusions. The effectiveness of the action against Alternaria spр.. on plants of three varieties and fusariosis, the first common, rhizoctoniosis and alternaria on potato tubers. Continuation of research in 2019 will determine the most effective options for potato processing, which will ensure the high efficiency of protecting plant potato from illness.