Amaranth gray mold, also known as white spot disease, is an important disease commonly occurring in winter and spring cold sheds. Most of the disease occurred in early December. With the growth and development of amaranth, the condition gradually worsened, and it can continue in the end of April of the next year. Generally, the yield is reduced by 20 to 30 percent. Moreover, the diseased leaves are often accompanied by a musty taste, which degrades the quality.
The disease mainly occurs on the leaves. When the initial dip is dyed, white to light gray-brown dots are formed on the leaf surface. The front side is more than the back side, and the tip is developed downward. The spots are expanded to have a fusiform or elliptical shape. When the humidity is high, the disease is high. The surface of the plaque produces a diluted layer of mold, and the lesions merge into a large piece at a later stage until the half or whole leaves are scorched. Sometimes the diseased leaves do not produce white spots, they rot down from the harvesting knife mouth, and are initially water-soaked. They are light green and have a brown wheel pattern. The lesions are mostly semi-circular to "V" shape and can be extended downwards to 2 3 cm, the diseased leaves are yellowish brown. When the humidity is high, it is a grayish brown or grayish green fluffy mold layer. The prevention method is:
First, the selection of resistant varieties such as Huang Miao, Keji No. 1, Zhongyu No. 2, Xueyan and so on.
Second, the use of no dripping film for dehumidification, timely release of air, cooling, reduce the humidity inside the air, to prevent the temperature inside the shed is too high.
Third, timely removal of diseased leaves buried or burned.
4. At the beginning of the disease prevention and treatment, the foliar spray can spray more than 50% of the fungicidal WP 500 times, or 50% of the Kling 1500 times, or 70% of the methyl thiophanate 800 times, or More than 50% of the moldy WP 1000 times, or 50% of the WP 1500 , solution, 40 to 50 kg per acre, sprayed every 5 to 7 days, even Spray 2 to 3 times. Pay attention to the medication. In case of cloudy days, it is best to use chlorothalonil or keiling smoke to prevent and cure.
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