Amaranth disease is an important disease in the production of amaranth. Linyi Fertilizer Network Copyright
Linyi Fertilizer Network Copyright
First, the symptoms of amaranth in all parts of the symptoms, especially the pseudo-stem and bulbs are the most seriously affected. The leaves are initially immersed in dark green lesions, and the lesions spread to half of the leaves. The leaves turn yellow, drooping, soft rot, and when the humidity is high, the disease minister has grayish white mold, and the pseudo stem is damaged by light brown and soft rot. The leaf sheath is easy to fall off, and the diseased part also grows a grayish and sparse mold layer when wet. When the bulb is damaged, the root disk is water-soaked, light brown to dark brown, rotten, and the longitudinal stem is visible in the interior is light brown, growth is inhibited, affecting plant storage nutrients. The roots are damaged, brown rot, root hair is reduced, new roots are rarely emitted, and the growth is obviously weakened. Linyi Fertilizer Network Copyright
Linyi Fertilizer Network Copyright
Second, the occurrence of regular pathogens with mycelium or thick-walled spores overwinter on the diseased body, the second year to produce sporangia, zoospores, inoculation of leek. Under humid conditions, the diseased part produces sporangia and zoospores, which are transmitted by wind, irrigation, etc., and re-infected. The optimum temperature for disease occurrence is 26-32 °C. High humidity is good for disease, soil moisture is large, air humidity The incidence is heavy. Linyi Fertilizer Network Copyright
Linyi Fertilizer Network Copyright
Third, the prevention and treatment methods: 1. Xiaoshui dip Phytophthora infestans spread by water, so if the water is flooded, the roots have weak water absorption capacity, indoor humidity is too large, and the disease occurs. 2. Rational fertilization on the basis of applying the base fertilizer (organic fertilizer), pay attention to the combined application of nitrogen, phosphorus and potassium. 3. Removal of sick and sick bodies is the main source of transmission of amaranth disease. Therefore, when the leaves are dry and fall to the ground, they should be removed in time and taken out to reduce the source of bacteria. 4. Strengthen the management of the growth process of leeks, such as indoor humidity is too large, the temperature is too high, you can choose sunny and windless, pick up the plastic film on the leeward side for about 3 hours at noon to reduce the indoor temperature and humidity. 5. In the initial stage of drug control, use 25% metalaxyl WP 750 times solution, or 58% metalaxyl Mn-Zn wettable powder 400-500 times solution, or 40% ethyl phosphorus aluminum WP 200 times solution, or 64% anti-virus M8 wettable powder 400 times liquid, or 50% nail cream copper wettable powder 600 times liquid spray control, 50 kg per mu spray liquid, spray once every 5 to 7 days, 3 to 5 times in a row . Linyi Fertilizer Network Copyright
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