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The responses of orange trees and fruits to freezing temperatures

, : The responses of orange trees and fruits to freezing temperatures. Proc Amer Soc Hort Sci 80: 247-254

Orange trees and fruits were exposed to various freezing temperatures for various periods of time by means of a portable freezing chamber under field conditions. Generally, the cooling rate of fruits was not influenced greatly by fruit size in the 2 varieties of oranges observed. The freezing point of Pineapple and Valencia orange fruits ranged from 27.5 to 29[degree] F with the majority of fruits freezing at 28-29[degree]. Subcooling as much as 5[degree] F occurred in orange fruits. In considering the 29 trees frozen and recording the temperature of 19 fruits from each tree, it was noted that generally fruits subcooled to near 24[degree] F before freezing. Fruit freezing did occur at a higher temperature (26[degree]) when held for a long period of time (11.25 hours). Critical temperature for leaf killing was 20[degree]F. Wood damage at freezing temperatures was associated with the length of new growth present. Leaf retention was indicative of wood 1 inch or greater in diameter killed.


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