Amaranth, alias grass stalactites, Qiyang grass, lazy dishes, etc., with its unique spicy smell, has become a kind of vegetables that urban and rural people like to eat. Viola is a cold-tolerant vegetable with strong adaptability. It is one of the main varieties in the solar greenhouse. In recent years, the sunlight greenhouses of high-efficiency demonstration parks across the country have been frequently planted since the successive years, and the occurrence of gray mold has become a major disease of the shed-eat leeks, affecting the yield and quality of leeks. The onset symptoms, incidence rules and integrated prevention and control methods of cinerea cinerea are described below for reference. First, the symptoms. The main damage leaves, divided into white point type, dry tip type and wet rot type. 1, white point and dry tip type in the front and back of the leaves white or gray-brown small spots, from the tip of the development of the downward, generally more than the front of the blade, the spot spindle-shaped or oval, late in the episode of mutual synthesis spot Block, half-leaf or whole-leaf. The dry tip is rotted by the cutting edge and is initially immersed in water, then light green, with a brown ring pattern. After the lesion spreads, it becomes semicircular or "v" shaped, and can extend downwards. 3cm, yellow-brown, gray-brown or grayish-green villous surface. 2. The wet rot occurs when the humidity is high. The surface of dead leaves is densely ash to green villous fungal, accompanied by musty odor, and no white spots are produced on the leaves. In the storage and transportation of leeks, the diseased leaves exhibited wet rot symptoms, completely wet and rot, and the appearance of gray mold. Second, the pathogenic and pathogenic law 1, pathogens. It is a semi-known fungus subphylum, Botrytis spp. 2. Incidence conditions. The gray mold of leeks is mainly spread by the conidia of pathogenic bacteria; each time when leeks are harvested, the germs can be scattered on the soil surface, and the new leaves caused by water flow, agricultural operations, etc. can be infected. The occurrence of this disease is closely related to temperature and humidity, and the optimum temperature for hypha growth is 15-21Â°C. Humidity is the main factor in inducing gray mold, air relative humidity is more than 85%, and less than 60% is light or not. Incidence, another night when the leeks were frozen, high temperatures during the day, while the humidity is large, the incidence is also heavy. Third, control methods 1, agricultural control (1) selection of disease-resistant varieties. Cold green tyrants F1 cold green king F1 and other varieties of high resistance to gray mold, 791, Pingyi 4 varieties followed, Hanzhong wolfberry not resistant to disease. (2) Clean the booth. After the leek is harvested, the diseased body is promptly removed, buried or burned to prevent the spread of pathogens. (3) turn over the sun. Turning the soil between the rows will help the soil to mature and kill some of the underground pests. (4) Ventilation and dehumidification. Timely ventilation and dehumidification to prevent excessive humidity in the shed is the key to prevention and treatment of the disease. According to the changes in the weather, before and after noon, the shed film pulled a gap to conduct ventilation and dehumidification, so that the relative humidity of the air in the shed fell below 70%. The amount of ventilation depends on the growth of the leek, and it is strictly prohibited to put the bottom wind. (5) Nurturing strong seedlings. Through the application of organic fertilizer, timely fertilizer application, watering, weeding, and cultivation of oysters enhance plant resistance. Before the planting, 5000-7000 kg of decomposed farmyard fertilizer, 15 kg of diammonium phosphate and 50 kg of plant ash shall be applied per acre before planting. Deeply plunge into the soil and irrigate large water; promptly irrigate water after planting; apply fertilizer twice per acre before applying frost. 15 kg, timely irrigation after dressing. (6) Wet grass between the rows. Lay dry straw between the leeks, absorb moisture, reduce humidity, and maintain the ground temperature. 2, chemical control (1) dust method. In the early evening of the onset of leek, use a duster to spray 70% extinguishing powder or 5% chlorothalonil dust agent at a dose of 1 kilogram per acre, every 10 days, continuously or alternately with other control methods. 2-3 times. (2) Smoke method. At the beginning of the disease, 10% fast-king spirit smoke agent is used. Each dose of 200-250 grams per acre, or 5% of chlorothalonil smoke agent, 250 grams per acre each time, 6-8 points are distributed, and the ignition is closed in the evening. Shed fumigation. 10 times a day, alternating with other control methods 2-3 times. (3) Spray method. In the initial stage of disease, each time before harvest, spray pesticides, alternately spray 50% carbendazim or 70% thiophanate-methyl WP, 500 times, and if necessary, select 50% Scroton or 50%. Pafluhain and 50% Nongliling WP 1000-1500 times, alternately, once every 7 days, continuous prevention and treatment 2-3 times. Note: When spraying, it is important to spray the medicine onto the new leaf, cut the mouth, and the surrounding soil.
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