ISHS Acta Horticulturae 192: VIII International Symposium on Apricot Culture and Decline
FROST TOLERANCE STUDIES IN APRICOT VARIETIES |
| Authors: | F. Nyujtó, Z. Erdös |
| Abstract:
In Hungary frost damages on apricot were evaluated according to varieties. Ceglédi hajnalpir /Scarlet Aurora of Cegléd/, Magyar kajszi /Hungarian Best/, Ligeti óriás /Giant of Liget/, Szegedi mammut /Mammut of Szeged/, Ceglédi óriás /Giant of Cegléd/ proved to be the tenderest. Mandula kajszi /Almond Apricot/ and Rakovszky were hardy, Kécskei rózsa /Apricot of Kécske/ C.320 and Borsi rózsa /Rose of Borsi/ have been found very hardy. Cold injury to flower organs was assessed in different phenophases. Many varieties have moderate bud mortality after artificial freezing from - 22 to - 25°C in December, but in January high bud mortality was recorded at - 25°C, this value was equal to - 15°C in February. Average injury to flower organs was high in red budding stage at - 10°C, and in white budding stage at - 5°C. Blooms survived at - 1.6°C, while fruits after setting could be damaged at - 0.6°C. Artificial freezing for 24 hours once causes less injury than freezing for 4 hours 2 times. Determining the number of dead flower buds by dissection of those was less reliable then forcing. | |
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