EN
Seedlings of hybrid forms of winter triticale and of their parents were hardened against frost and their frost resistance was determined. Three groups of cultivars were separated with respect to their frost resistance: 1) Low resistant: Salvo and Bolero, 2) Intermediate: Almo, Ugo and LAD 490, 3) High resistant: Tewo, Bogo, Tornado, Nemo and Vero. Heterosis in relation to frost resistance was not significant when the hybrid forms were compared with a better parent, but it appeared while comparing the frost resistance of some hybrid forms with mean values of that of parents.