ISHS Acta Horticulturae 444: III International Symposium on Kiwifruit
FROST DAMAGE AND PROTECTION OF KIWI VINES |
| Authors: | G.D. Nanos, E.M. Sfakiotakis, C. Boufidis, K. Tsitouridis |
| Abstract:
Active protection from Fall and Spring frosts is evaluated to reduce damages from low temperatures. Laboratory preliminary results will be discussed as related to the temperature/time at this temperature needed to damage buds at various growth stages. Wind machines were found effective as field temperature at vine height was increased 1 to 2°C at a radius of about 150 m. Temperature at each point was increased up to 2°C every 4'15" (rotation frequency of the wind machine). Early in the morning, when the lowest temperature was reached in the field, air temperature increased with height up to 20 m and was about 5°C higher than air temperature at vine height. We found no damage in buds breaking late March when they were at a radius of 40 m around the wind machine, small damage at a radius of 100 m and bigger damage at the corners of the 2.5 hectare area. Frozen buds looked wilted next morning and dried out in a few days. A month later all these buds had sprouted from a secondary meristem and gave non-fruiting shoots. | |
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