Citrus freeze injury generally refers to injury or death caused by orange trees at freezing temperatures. The temperature of freezing injury of citrus was: -2°C is dangerous temperature; -3°C is the temperature of frost damage to the foliage; -9°C when the skeleton is damaged; -11°C is frozen to death on the ground. Low temperature is the main factor of freezing injury, but citrus cold tolerance is related to many factors such as citrus species and varieties, tree species, tree vigor, soil topography, phenological period, low temperature intensity and its duration, and previous weather characteristics. In terms of citrus varieties and varieties, their cold tolerance ability was: broad-leaf oranges → oranges → grapefruits, and lemons and cockroaches were the least resistant to cold. Among the broad-leaved oranges, Zhuju and Wenzhou tangerines are the most resistant to cold. In general, it is about 2°C stronger than sweet oranges. The cold resistance of citrus is related to the winter dormancy characteristics. In its forced dormancy state, the early and late winter dormancy and its stability are closely related to cold resistance. Wenzhou tangerine is more hardy because it enters dormancy earlier than other species, and it is also relatively stable. In addition to the temperature, the frost damage is also closely related to the duration of the temperature. Under the same temperature conditions, the longer the duration of low temperature, the more serious freezing injury, and the low temperature for a few hours, the hazard of a lower temperature than the short time is greater. In addition, the freezing injury is also related to the speed of temperature changes, the time when low temperature occurs, wind speed and so on. Most of the citrus cold damage was caused by the influence of the cold wave southwards. In the process of the cold wave, extreme cold usually occurs during the sunny days. It is clear from midnight to early morning in the first 2-3 days of the sunny day. The ground dissipates the most heat, and the strongest cooling is often accompanied by frost, especially snow. Extremely cool down nearby. Therefore, frost after frost, especially after frost, is the focus of protection against citrus freeze injury. In the event of cold weather, weather broadcasts and weather forecasting stations at weather stations should be heard in a timely manner to understand and analyze the time and degree of occurrence of citrus cold injury, and measures should be taken to reduce and avoid hazards.
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