Testing of wood hardiness to winter freezes in selections from progenies of Cerapadus x Prunus avium crosses
2002
Blazkova, J. | Hlusickova, L. (Vyzkumny a Slechtitelsky Ustav Ovocnarsky, Holovousy (Czech Republic))
Winter hardiness of genotypes pre-selected from Cerapadus x Prunus avium crosses was studied for 3 years (2000-2002) in comparison with clonal cherry rootstocks, presently grown in the Czech Republic using artificial freezing of the budwood applied just after the phase of deep dormancy. With a temperature drop to freezing, both the mean and the maximum rate of general frost injury was markedly increased. The greatest damage of the tested material (roughly at the level of LD 50 on the average) occurred after the application of combined low temperatures -25 deg C for 4 hours and -20 deg C for 66 hours. The results of laboratory tests were compared with the damage of natural frost that occurred during the first half of January, 2002. The single observed years did not differ from each other in the extent of injury, on the average.
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