FROST HARDINESS OF OVERWINTERING ORGANS OF SOME PROMISING FOREIGN APRICOT CULTIVARS IN HUNGARY
There is a big tradition for apricot production in Hungary, but it is restricted because of bad ecological adaptability and frost sensitivity of genotypes. Before introduction of new foreign cultivars, it is very important to observe accurately the frost hardiness and winter tolerance of them. We have started to examine six foreign cultivars in winter 2010-2011. In this project our aim was to define the frost hardiness of the overwintering organs of new cultivars in different times of winter, and to describe the frost hardiness profile of them during winter. The frost hardiness of overwintering organs was determined by artificial freezing tests. Based on the results the LT50 (it is the temperature causes 50% frost damage) values were calculated. The following cultivars were observed: Laycot, Pincot, Pisana, Sungiant (Goldrich), Sylred, Sylvercot, and Gönci magyar kajszi as control. Flower buds are the most frost-sensitive organs during winter, so we concentrated on them. The frost hardiness of flower buds increased gradually in the first half of winter, and decreased gradually in the second half of winter. The flower buds were the most frost hardy in the middle of winter, when the LT50 value of Gönci magyar kajszi was -20.5°C. The examined foreign cultivars showed -18.5°C LT50 values in this time. Based on our first year results these cultivars are more frost sensitive than traditional Hungarian cultivars. It is necessary to continue observing to get more accurate results.
Hajnal, V., Németh, SZ., Szalay, L. and Vécsei, A. (2013). FROST HARDINESS OF OVERWINTERING ORGANS OF SOME PROMISING FOREIGN APRICOT CULTIVARS IN HUNGARY. Acta Hortic. 981, 587-590
apricot, flower bud, frost tolerance, winter hardiness