Spinach leaf spot control method

Symptoms: The main damage to the leaves, the first disease of the lower leaves, lesions are round to near-circular shape, the edge is obvious, the middle of the initial disease Department chlorosis, the outer edge of light brown to purple-brown, gradually developed into a white spot, when the humidity is high, some Grayish-brown mildew can be seen on the lesions. When the dry-wet transition is intense, the diseased part is easily broken and some of the gray moldy material grows.

Transmission route and disease conditions: The mycelium is overwintering in the soil with the diseased body, and the spores produced by the spring and spring, the spread of wind and rain, and the initial infection, and the diseased part of the diseased part and the conidia Reinfestation continues to expand. The growth is weak, and the conditions of warm and high humidity are prone to onset. The low-lying terrain, nesting wind, and poor management are serious.

Control methods:

(1) Spinach should be planted on a well-ventilated land with a flat topography and adequate organic fertilizer. Watering and fine management should be conducted to improve the resistance to disease.

(2) Dispose of the diseased body promptly after harvest, and concentrate deeply or burn it to reduce the source of bacteria.

(3) Early stage of onset spray of 27% copper noble suspension 600-fold or 1:0.5:160-fold Bordeaux mixture, 40% chlorothalonil suspension 600x, 50% polymyxin (Doxamicin) wettable powder 1000 times, every 7 to 10 days, control 2 to 3 times.

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