![]() ![]() The temperature at which freeze injury begins to occur depends on the stage of development from dormant flower buds through young fruit. ![]() Temperatures must drop below 28☏ for economic losses to occur on highbush blueberry ( Vaccinium corymbosum L.). The cold air will be displaced or mixed with the warmer air from higher locations and less temperature drop will occur.Ĭold Susceptibility Skip to Cold Susceptibilityīlueberry blossoms and small berries are considered hardier than the blossoms of most fruits. Removal of trees and brush from around the field to improve air circulation will allow these breezes to penetrate the field at bush level. Although there is almost no wind during a radiation frost an occasional gentle breeze will occur. The cultural requirement for a uniform soil moisture makes selecting higher sites that are less subject to radiation frosts much less practical than with other fruit crops. ![]() Also, the high organic content, especially if the soil is dry, acts as an insulator to restrict heat in the soil from moving up around the plants. ![]() However, on cold, still nights when radiation frosts occur, heavy cold air from higher surrounding areas "drains" into the low areas causing lower temperatures. These sites satisfy the cultural requirements of blueberries for a constant and uniform moisture supply. Freeze-Prone Sites Skip to Freeze-Prone SitesĬommercial blueberries are generally planted in low areas with high organic-matter content. ![]()
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