Affection of the studied potato varieties (Solanum Tuberosum) Streptomyces scabies and Fusarium oxysporum in irrigated conditions of the Orenburg region

A comprehensive phytopathological assessment of potato varieties of different ripeness groups was carried out in the Orenburg region in 2015-2018 in order to establish the prevalence of major pathogens using the Protect and Abiga Peak fungicides against a natural infectious background under irrigated conditions. The plot area is 140 m 2 (length is 50 m, width is 2.8 m). The accounting area is 70 m 2 (length is 50 m, width is 1.4 m). The arrangement of options in the repetition is systematic. In the research we studied 17 varieties, such as mid-early - Nevsky (standard), Spiridon (standard), Lyubava, Fresco, Red Scarlett, Sante, Impala, Sheri, Rosara, Agat, Itzil, Bracelet, mid - season - Kuzovok, Burren, Tarasov, Zakhar, Cavalier. In 2015 the most susceptible to Streptomyces scabies Waks. & Henr. were varieties: Lyubava – 13.8%, Agat – 5.6%, Red Scarlett – 5.2%, Tarasov – 5.1%, Fresco – 3.0% and Burren – 2.2%, including standard varieties: Nevsky – 12.8% and Spiridon – 5.1%. This year we also observed the greatest defeat of tubers with stolon rot ( Fusarium oxysporum Schlecht.): Agat – 4.9%, Fresco – 5.3%, Burren – 8.7%, Nevsky – 4.9%, Spiridon – 3.0%. Eight of the 17 studied varieties, such as Tarasov, Sante, Impala, Sheri, Zakhar, Itzil, Cavalier, Bracelet were resistant to Fusarium oxysporum Schlecht and Streptomyces scabies Waks. & Henr. When using fungicides (Abiga Peak, Protect) plant damage was practically not observed. Cavalier and Zakhar potato varieties, which combine high productivity (40 t/ha) and resistance to the studied pathogens, have been identified and recommended for use under irrigated conditions of the Orenburg region.