Control of Soybean Downy Mildew
Soybean downy mildew damages seedlings, leaves and seeds. When the first true leaf unfolds, chlorotic patches appear along both sides of the vein. The leaf surface of adult plant is round or irregular, the edge is not clear yellow-green star point, then turn brown, the back of the leaf has gray mold layer. The surface of diseased grains adhered to gray hyphal layer, containing a large number of pathogen ospores. The pathogen overwinters as ospores on seeds and diseased leaves and becomes the source of infection at the beginning of next year. The disease begins in the middle and late June every year, and the peak period is from July to August. The disease is often serious in rainy years.
Control methods:
(1)Agricultural control. Choose disease-resistant varieties, select seeds, eliminate diseased seeds, and implement 2-3 year rotation.
(2)Chemical control. Seed dressing with 40% Phosphoethyl WP or 25% Metalaxyl WP at 0.5% of seed weight. When the disease occurs in the field, it can be sprayed with ethyl phosphorus aluminum 300 solution or metalaxyl 800 times solution, and about 40 kg of liquid medicine is used per 667 square meters.
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Identification and control techniques of soybean downy mildew
Downy mildew occurs more frequently in soybean producing areas in China, especially in northeast and north China during the soybean growth period, and the disease aggravates in rainy years, which seriously leads to premature fall or withering of leaves, mildew of seeds and a reduction of 30% to 50%. It is mainly harmful to leaves, pods and beans of seedlings or adult plants. The pathogens on the diseased seeds caused the disease of the seedlings by systematic infection, but the cotyledons did not show symptoms. When the first pair of true leaves unfolds, chlorotic patches appear along both sides of the leaf veins and expand along the main veins and lateral veins. Cause the whole leaf to fade, there are
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Trace elements needed for soybean growth and their application
The normal growth of soybean needs some trace elements, among which molybdenum, boron, zinc, manganese and so on are more important. Molybdenum is a component of nitrogenase in soybean nodules and an indispensable component in the normal life activities of nitrogen-fixing bacteria. Boron is also very important in the life activities of soybeans, such as poor root development, poor nodule growth and loss of nitrogen fixation ability. Therefore, attention must also be paid to trace elements. Can the trace elements needed for soybeans be satisfied from the soil? It depends on the abundance and deficiency of trace elements in the soil and the state of the environment. Such as low-lying or non-drainage
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