Promising hybrid combinations for potato breeding for late blight resistance in the Magadan Region

Late blight is the most common potato disease in the North of the Far East. In the case of conditions favorable for the development of late blight, caused by the onset of a rainy period and sharp fluctuations in night and day temperatures, the disease spreads quickly and after 5–10 days leads to the complete death of plants. The purpose of the research was to evaluate hybrid combinations for their resistance to late blight and to identify among them highly productive samples that are promising for creating new potato varieties with high field resistance to late blight. In total, about 200 hybrid combinations were studied, among which hybrid combinations were identified that were promising for breeding for late blight resistance and high productivity. These are combinations represented by mid-season and early varieties with high field resistance to late blight Baraka × Ausonia, Udacha × Ausonia, Dar × 1198-2. Hybrid combinations represented by mid-late or late-ripening varieties highly resistant to late blight, such as Zarevo, Cardinal, Granola, Picasso, are low-yielding, but can become the basis for a new variety that can form a fairly high yield in epiphytoy years. The offspring of hybrid combinations with early ripening varieties Udacha and Ausonia, although characterized by susceptibility to late blight, are able to form a high yield in the early stages, which makes it possible to obtain a high commercial yield before the massive development of late blight. Hybrid combinations having in their origin the varieties Adora, Volzhanin, Zhukovsky ramity, Chernigovsky, Lira, Lina are unpromising for research. Their offspring are characterized not only by a strong susceptibility to late blight on the tops, but also by low shelf life associated with rotting of the tubers during storage.