Meteorological disasters are a variety of disasters caused by anomalous meteorology to mulberry trees, mainly including frost, freezing, wind, and flooding. These disasters will affect the growth of mulberry trees, but they will reduce the quality of mulberry leaves. In severe cases, they will cause mulberry trees to die. During the cultivation of mulberry trees, attention should be paid to listening to local weather forecasts, taking possible preventive measures, and doing the aftermath of disasters to minimize disasters. 1. The frost damages the mulberry tree and mainly occurs after the sprouting of the mulberry tree in the spring. Late frost usually occurs in the cold weather. On a sunny day, it is fine and windless in the evening. At around 9:00 in the evening, the temperature is below 10°C, and frost may occur before dawn. In general, early Sang Sang is vulnerable, and the low-level Sangbi middle- and high-dry mulberry suffers heavy damage, and the lower part is heavier than the upper part. The sprouting bud is heavier than that of the budding bud. Frost damage is manifested in the germinating shoots, and the light localized scorch and heavy scorch. The mulberry field anti-frost measures include smoke smoke method, irrigation method and the like, but it is difficult to apply in a large area of ​​mulberry garden. The mulberry tree was damaged by night frost and it must be dealt with according to the circumstances of the victim. The leaves are scorched and the growth points are in good condition, allowing them to grow; if most of the shoots are scorch, the scorch section should be cut off to promote the germination of the lower dormant buds. The frosted mulberry field should be increased by applying a quick-acting fertilizer to promote the growth of buds; or when the leaves are open to 3 to 4, the extra-root dressing with 0.5% urea solution should be used 3 to 4 times. 2. Frost damage and frost damage are all caused by cold attacks. However, there is a clear difference between frost damage and frost damage: First, from the time of occurrence, frost damage generally occurs before the late autumn leaf fall or early spring budding and leaf opening, while the freezing injury occurs during the dormancy phase of mulberry trees, and before and during sleep. In terms of the damage, the frost damage is to injure buds, and the frost damage mainly damages the branches, trunks and even the roots; the frost damage temperature is -3 to 3°C, and the freezing damage is below -5°C. In general, the younger than the age of the trees is weaker than the old ones, and the low-level Sangbi middle- and high-dry mulberry suffers heavy damage. The summer-harvested mulberry is more severe than the spring mulberry, and the leaves of the shoots at the tip of the late autumn period are lighter than those without the leaves. . Freezing damage manifested on shoots and trunks, and the frozen injury parts showed obvious shrinkage and dryness. The mulberry field anti-freeze measures include cold-resistant varieties, reasonable harvesting, fertilization and drainage, and cover soil antifreeze. 3. The effect of wind damage on the growth of mulberry trees varies with the wind speed. The general wind speed can adjust the temperature, humidity and air composition of mulberry garden, which is beneficial to the growth of mulberry trees. When the wind speed is 10 m/s, the branches can be shaken and the mulberry leaves can be broken and the leaf quality can be reduced. When the wind speed is above 20m/s, the branches can be broken and the mulberry can be fallen down. Wind damage occurs frequently in areas that are vulnerable to typhoons and in the typhoon season each year, and mulberry fields are established in areas that are vulnerable to wind damage. Shelterbelts should be established in conjunction with other crops. After hearing the typhoon warning from the local meteorological observatory (station), several branches of the shoots can be tied together to prevent the branches from swinging and breaking the leaves. The mulberry field must be inspected after the wind damage. The broken branches should be cut off. The fallen mulberry tree should help straighten the soil and catch up with the quick-acting fertilizer to accelerate the restoration of tree vigor. 4. Most of the pests and diseases have occurred in late spring and early fall. They are sudden disasters in local areas and have a destructive effect on mulberry trees. The victim was light, and the mulberry leaf was damaged. The victim suffered heavy damage. The shoots and leaves fell and the branches broke. The output of the mulberry leaf was seriously damaged. During the spring silkworm period, it is affected by earthworms. It can be used for spring cutting so that it can produce more productive summer and autumn leaves. In summer and autumn, where the damage is heavy, the broken branches can be cut off, and the fertilizer and water management can be strengthened so that the growth can be quickly resumed.
