What are the common pests and diseases of spinach? How to prevent it? The following is mainly from the three main diseases of spinach to talk about the comprehensive control measures of common diseases of spinach, I hope you can help you planted spinach! First, spinach leukoplakia Hazard symptoms: Spinach leukoplakia is mainly expressed on the leaves. The lower leaves first developed, the lesions were round to nearly round, the lesions were yellow-white in the middle, and the outer edges were brown to purple-brown. After expansion, they gradually developed into white spots. When the humidity is high, some gray spots appear on the lesions. When the dry and wet changes are fierce, the middle part of the lesion is easily broken. The spinach leucocysts overwinter in the soil with the mycelium and the diseased debris, and the spring bacterium is spread by wind and rain. The growth is weak, and it is easy to develop under warm and humid conditions. The terrain is low, the wind is weak, and the management is not serious. Control method: Select spinach with flat terrain and sufficient organic fertilizer to plant spinach, properly watering, fine management, and improve plant disease resistance. Remove the diseased body in time after harvest, concentrate on deep burial or burn to reduce the source of the disease. In the early stage of the disease, spray 30% green suspending agent 400~500 times solution, or 1:0.5:16 Bordeaux mixture, 75% chlorothalonil WP 700 times solution. Second, spinach wilt Hazard symptoms: Spinach blight usually occurs more severely in the adult stage. It is characterized by the darkening of the old leaves, the yellowing of the mesophyll, and the upward expansion. When the development is downward, the roots become brown and die. Plants with early onset are significantly dwarfed. When the weather is dry and the temperature is high, the diseased plant quickly sallows. Under humid and low temperature conditions, the diseased plants can continue to survive for a period of time, sometimes with new lateral roots. But in the case of hot weather, it quickly died. Control methods: 3 to 5 years of rotation with green onion and gramineous crops to avoid continuous cropping. The compost or fully decomposed organic fertilizer prepared by Japanese enzyme bacteria is applied, and the formula fertilization technology is adopted to improve the host disease resistance. It is cultivated with sorghum or ridges, drained in time after rain, and is strictly prohibited from flooding. It was found that the central diseased plant was removed in time, and the venous and surrounding leaching 50% benomyl WP 1500 times solution, 40% polysulfur suspension 500 times solution, or 10% wilting water agent 300~400 times solution, half Spray once a month for 2 to 3 times. Third, spinach downy mildew Hazard Symptoms: Spinach downy mildew is the highest incidence of spinach, caused by a fungus called spinach downy mildew. The symptoms of field hazards are as follows: the main damage to the front of the leaves, the lesions are pale yellow; after the lesions are enlarged, they are connected to each other and become brown and dead. A gray-purple mold layer is formed on the lesion on the back of the leaf. The disease progresses from the outer leaf to the inner leaf and extends upward from the lower part of the plant. When the drought is dry, the diseased leaves are yellow, and when the humidity is high, the leaves are rotted, and the severe whole leaves turn yellow and die. Control method: strengthen cultivation management. Reasonable close planting, scientific irrigation, and reduction of field humidity. Choose resistant varieties. You can use Savo hybrid 612, Barnti, Bowness and other famous varieties, as well as sharp-leaf varieties. Seeds are collected on disease-free or disease-free plants. If the seed is contaminated, it can be seeded with 50% thiram double wettable powder before sowing, and the dosage is 0.4% of the seed weight. In the early spring, the diseased plants were found in the spinach field, which should be removed in time and brought out of the field for burning. In the early stage of the disease, spray 40% ethylphosphorus aluminum wettable powder 200~250 times solution, 58% metalaxyl manganese zinc wettable powder 500 times liquid, 64% antivirus WP WP 500 times liquid, or 72.2% Plex water 800 times liquid, spray once every 7~10 days, 2~3 times in a row. These are all the main points about the common diseases of spinach and its prevention and control. If your spinach is also seen in this situation, then let it be prevented!
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