APPLE HYBRIDS FROST DAMAGE RATE DEPENDING ON THEIR PARENTAGE
Apple is main fruit culture in Russia including Siberia. Breeding winter hardy varieties adapted to local ecological conditions is the main method of increasing apple winter-hardiness. Winter-hardiness is considered in selecting parental forms. The best results in winter-hardiness apple breeding received using winter hardy and high winter hardy varieties as parental forms. The paper presents 3-years results on frost damage of 1481 apple hybrids 2002-2004 years of cross-breeding in the Lisavenko research institute of horticulture in winters 2009/10, 2010/11, 2011/12. 9 stocks with the most non-frostdamaged (0 numbers) hybrids are selected. The possibility of selecting winter hardy hybrids (0-1 numbers of frost damage) in all investigated stocks is shown.