Downy mildew and leafy mildew are the most common diseases on spinach. Too much humidity is conducive to the occurrence of these two diseases. Downy mildew usually begins with the lower leaves and begins to develop light green water-stained spots. The edges of the lesions are not obvious. Later, it develops yellow irregular lesions. When the humidity is high, the gray and white layer of the leaves grows and gradually becomes Dark gray. In the shed, the diseased leaves gradually turn yellow and dry when the drought occurs, and when the air humidity is high, the diseased leaves become rotten. In the early stage of leaf mildew, the leaves showed a pale yellowish edge with irregular and irregular lesions. The color became darker in the later period. When the humidity was high, the grayish brown to brown mold layer grew on the back of the leaves, and the diseased leaves gradually curled to death.
Prevention of downy mildew and leaf mold, ventilation and humidity is the key, especially after watering to pull the air outlet, fast-growing spinach, as long as the temperature is not too low at night, you can open vents overnight. Lighter fields can be manually removed to prevent the spread of pathogenic bacteria. Chemicals prevent downy mildew, can be sprayed with 75% chlorothalonil wettable powder 500 times in the early stage of the disease. When the disease is severe, 58% methadium zinc WP can be used 500 times, or 70% AI can be used. Wet powder 500 times, or 69% magnesium zinc methacrylate wettable powder 800 times spray. For the control of leaf mold, it can be sprayed with 10% polymycin wettable powder 750 times solution, etc., and used alternately every 5 to 7 days for continuous prevention and control 2 or 3 times.
Prevention of downy mildew and leaf mold, ventilation and humidity is the key, especially after watering to pull the air outlet, fast-growing spinach, as long as the temperature is not too low at night, you can open vents overnight. Lighter fields can be manually removed to prevent the spread of pathogenic bacteria. Chemicals prevent downy mildew, can be sprayed with 75% chlorothalonil wettable powder 500 times in the early stage of the disease. When the disease is severe, 58% methadium zinc WP can be used 500 times, or 70% AI can be used. Wet powder 500 times, or 69% magnesium zinc methacrylate wettable powder 800 times spray. For the control of leaf mold, it can be sprayed with 10% polymycin wettable powder 750 times solution, etc., and used alternately every 5 to 7 days for continuous prevention and control 2 or 3 times.
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