ISHS Acta Horticulturae 168: II Symposium on Winter Hardiness in Woody Perennials
CORRELATION BETWEEN THE RESULTS OF ARTIFICIAL FREEZING TESTS AND SURVIVAL OF PEACH TREES IN ORCHARD |
| Author: | T. Holubowicz |
| Abstract:
During the First European Symposium on Winterhardiness in Woody Perennials in 1977, a survival test was presented as a method of frost injury estimation for fruit trees. The survival test is based on a 5-degree scale in which 1 - indicates uninjured shoots, 3 - T-50 border of recovery possibilities, and 5 - completely killed shoots. The results obtained in artificial conditions indicated that samples rated at "3" were able to survive the initial temperature stress (the critical temperature) and regenerated in 80%. Only 20% of stressed plants rated at "3" had perished (Holubowicz, 1978). During the winter of 1978) 1979, in which the temperature dropped to -20.5°C below zero, it was possible to compare the injury of peach trees in orchard with the results of the artificial freezing test made just before the critical frost stress. The obtained results confirmed the finding that the plants rated at "3" are able to survive and recover after frost stress. | |
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