symptom. The northern planting mulberry area is often attacked by late frost or early frost. When the night frost hit, the heavy shoots of the affected victims were frozen. After the temperature rose, the cold damage was water-stained, and the light leaf color of the victim became lighter or shrunk, and the growth was slow. Leaves and buds that have been severely frozen become dark brown and the leaves lose water and curl or fall off. After the early frost attacks, the shoot tips or mulberry leaves withered, and the frozen shoots gradually lost water or shrunk from the top to the bottom. The bark dried or wilted and severed. Prevention and control methods (1) Use strong cold-resistance varieties with late spring buds and multiple sprouts in spring. For example, choose 792, Yu 8 and 7946. (2) The use of formula fertilization technology, so that a reasonable mix of nitrogen, phosphorus and potassium, to ensure that the mulberry grows robustly in summer and autumn to prevent late autumn leggy. (3) Timely and reasonable summer cuts, moderate summer and autumn harvests, and if necessary, summer or summer harvesting or summer harvesting. (4) Do a frost forecast and ignite fumes or apply anti-frost smoke bombs before the frost arrives. (5) Watering in time to prevent sudden changes in temperature. Spray 72% of streptomycin sulfate or 4000 times of streptomycin for agriculture to control ice nucleation bacteria.
Chinese Herbal Medicine (English name: Chinese herbal medicine): Chinese medicine is mainly composed of botanical medicine (root, stem, leaf, fruit), animal medicine (viscera, skin, bone, organs, etc.) and mineral medicine. Because botanical medicine accounts for the majority of Chinese medicine, Chinese medicine is also called Chinese herbal medicine.
There are about 5,000 kinds of Chinese medicines used in various parts of China, and there are countless prescriptions made by combining various medicinal materials. After thousands of years of research, an independent science, Materia Medica, has been formed. Various medical schools in China have set up the course of natural medicine, which is called the Chinese herbal medicine.
The concept of plant extracts can be accepted and recognized by various countries, and it is also a common expression used to spread herbal medicines in various countries. The export value of plant extracts in China exceeded the export value of Chinese patent medicines as early as 1999. In European and American countries, plant extracts and their products (plant medicines or food supplements) have a broad market prospect, and have developed into an emerging industry with annual sales of nearly 8 billion US dollars.
The plant extracts in China are generally intermediate products, which are widely used, mainly used as raw materials or auxiliary materials for medicines, health foods, tobacco, cosmetics, etc. There are also many kinds of raw material plants used for extraction, and there are more than 300 plant varieties that are extracted industrially.
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The etiology temperature is lower than 0°C, and the cold air forms a frost damage, and the late frost is often heavier than the early frost. -5 °C below the risk of frost damage. Late frost in Shandong sang sang area is mostly from late April to early May. Early germinating varieties are susceptible to freezing, and dwarfs are often susceptible to high temperatures. The presence of ice nucleation bacteria often aggravates the occurrence of frost damage. Frost damage occurs in early spring. Excessive leaves in summer and autumn, partial application of nitrogen fertilizer, mulberry branches appear vulnerable to mulberry gardens, summer cut mulberry gardens than spring harvest mulberry, new mulberry gardens than the old mulberry victims suffer heavy, southern varieties, especially branches skin color Shallow mulberry varieties suffer heavy damage. 
