Spinach should not grow when the temperature is high. If the temperature exceeds 25 °C, the growth is poor, and the quality is relatively poor. If the high-efficiency planting method is adopted, it is planted in June-July, and it is listed in August-September, and the economic benefit is particularly high. According to the China Pesticide Network , the main diseases of spinach are downy mildew, viral disease, anthracnose, and the main pests are aphids, leaf miners, etc. It is very important to timely control pesticides.
Symptoms of spinach leukoplakia disease: The symptoms of spinach leukoplakia are mainly manifested in the leaves. The lower leaves first developed, the lesions were small and round, the edges were obvious, 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 air humidity is high, the gray hair is visible on the lesion, and when the air is wet and wet, the middle of the lesion is easily broken. This disease is caused by fungi.
Infection of spinach leukoplakia disease: Spinach leukoderma fungus is overwintered in the soil with mycelium and 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.
Spinach leukoplakia disease prevention and treatment:
1. Strengthen management to improve disease resistance of plants; rationally rotate, timely remove leaves from residual crops of former crops, bring them out of the field for deep burial and burning; and spray disinfectant with ground and 800 times solution of new high-fat membrane to disinfect the soil. Treatment; application of new high-fat membrane seed dressing before sowing, sowing at the right time, then using the new high-fat film spray surface insulation to improve the emergence rate. Strengthen field management, respond to time seedlings, remove field weeds; watering to lower ground temperature; spray organic fertilizer to achieve nitrogen, phosphorus and potassium application, spray stalks at the appropriate stage of spinach growth, so that plant stems are strong The leaves are hypertrophied, improve the resistance of spinach, reduce the amount of pesticides and fertilizers, reduce the residual toxicity , and improve the natural taste of spinach.
2. Remove the sick body in time after harvest, concentrate on deep burial or burn to reduce the source of the disease;
3. Chemical control.
Pesticide manufacturers recommend spraying 75% chlorothalonil WP 700 times solution, 50% more moldy WP 1000 to 1500 times solution, etc. at the initial stage of the disease, and spraying once every 7 to 10 days. Spraying 2 to 3 times at the same time with the application of a new high-fat film 800 times liquid to enhance the efficacy.

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