Recently, a lot of vegetable farmers asked Hui Nong.com has a white spot on the spinach leaves. What happened? In fact, this phenomenon we call spinach leukoplakia, then the problem is, how to prevent spinach leukoplakia? Therefore, the correct prevention and treatment method of spinach leukoplakia is the main content of Hui Nongwang Xiaobian today! First, the symptoms and harms of spinach leukoplakia Spinach leukoplakia is mainly expressed on the leaves. The lower leaves first developed, the lesions were round to nearly round, the edge of the lesion was obvious, the size was 0.5-3.5 mm, the lesion was yellow-white in the middle, and the outer edge was brown to purple-brown. When the humidity is high, some gray spots are visible on the lesions; when the dry and wet changes are intense, the center of the lesion is easily broken. Spinach leucovorus bacteria overwinter in the soil with diseased debris, spring pathogens spread by wind, rain spread, weak growth, warm and humid conditions are easy to occur, low-lying terrain, nest wind, poor management and serious incidence. Second, the prevention and treatment of spinach leukoplakia 1. Choose spinach with flat terrain and sufficient organic fertilizer to plant spinach, water it properly, and manage it carefully to improve the disease resistance of the plant. 2. Remove the diseased body in time after harvest, concentrate on deep burial or burn to reduce the source of the disease. 3, in the early stage of the disease, spray 30% basic copper sulfate suspension 400-500 times solution, 50% more moldy WP 1000-1500 times solution, 75% chlorothalonil WP 700 times, every 7 - Spray once every 10 days, even spray 2-3 times. Well, about the symptoms of spinach leukoplakia and its prevention and treatment methods, Hui Nongwang Xiaobian explained this to you today, there will be more updates of spinach-related planting knowledge in the later period, and the needy farmers can continue to pay attention to Hui Nongwang!
Plant extraction process
1. Select plants/medicinal materials. It is nothing more than ancient prescriptions, proven prescriptions, and folk medicinal herbs. At present, common and uncommon medicinal materials have been studied. Most of the time, the amount of medicinal materials has been increased to extract low-isolated components, or medicinal plants have not been studied from Miao medicine, Tibetan medicine, Mongolian medicine, Africa, Latin America and other places.
2. Extract. Solvent petroleum ether, n-hexane, cyclohexane, benzene, chloroform, ethyl acetate, n-butanol, acetone, ethanol, methanol, water (small polarity → large polarity). Daily decoction of medicines is effective, use water and ethanol and other solvents with high polarity. Artemisinin and other boiling methods are not effective, use petroleum ether and other solvents with low polarity. The common medicinal materials, water/alcohol/ether, are presented again, and more compounds can be separated and identified.
3. Separation. This is the most important task. There are dozens of compounds in the solution extracted in the second step. Generally, column chromatography is used, which is what we often call column flushing. The workload is large, boring, and low-tech. A master's degree may do this every day for 2 years of experimentation. As shown in the figure below, the column for separating compounds is as large as 2 meters high and as small as 10 cm. Change the solvent conditions of the mobile phase, change the material of the column, and repeatedly wash the column under different conditions and separation principles to separate the monomer compound. High Content Monomer,Kudzu Root Powder,Magnolia Bark Extract Powder,Golden Turtle Lotus Extract Shaanxi HuiKe Botanical Development Co.,Ltd , https://www.oasis-hk.com
