Low temperature hazard cherry

Big cherries are fruit trees that are not very cold-tolerant, making them suitable for cultivation in regions with an annual average temperature ranging between 10 and 12 degrees Celsius. Abnormal temperatures refer to extreme conditions—either excessively high or low—that fall outside the ideal range for large cherries. Typically, high temperatures cause less damage to cherry trees, while low temperatures can be more harmful. Cold damage can occur at different times and in different forms. It is mainly categorized into two types: winter frost damage and blossom frost. 1. **Winter Frost Damage** occurs due to varying levels of severity. Light frost injury affects flower buds, causing them to freeze and die. In cases of severe frost damage, upper branches and parts of the tree canopy may suffer from frostbite and eventually die. In the most extreme cases, major branches and the main trunk can be frozen, leading to the death of the entire tree. The critical temperature for winter frost damage is generally below 20°C. However, even at 18°C, significant damage to large branches has been observed. When temperatures drop as low as -25.2°C, many trees can die en masse. Under similar low-temperature conditions, sudden temperature drops tend to cause more severe damage than gradual declines. Different cherry species also show differences in cold hardiness. Sour cherries are generally more cold-resistant compared to sweet cherries, which are more vulnerable to freezing. Within the same species, healthy and well-nourished trees tend to experience less frost damage, while weak or undernourished trees are more likely to suffer severe injury. 2. **Blossom Frost** is considered the most significant low-temperature threat to cherry crops. The critical temperature during flowering depends on the stage of the bloom. As the flowering process progresses, the tree’s ability to withstand cold decreases. During the bud coloring stage, temperatures as low as -5.5°C to -1.7°C can cause damage. During full bloom and when young fruits are developing, temperatures between -2.8°C and -1.1°C can lead to serious harm. Mild frost may only affect flowers and young fruits slightly, but severe frost can result in total crop loss. In summary, big cherries require careful management in cold climates. Understanding the different types of frost damage and their thresholds is essential for successful cultivation. By selecting appropriate varieties and managing tree health, growers can reduce the risk of cold-related losses.

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