Potato late blight symptoms and prevention methods
Late blight is one of the major diseases of the potato. It spreads quickly, and the damaged stems and leaves soon rot and die, mostly after flowering. It is called "late blight"; potato leaves, stems, and tubers can all suffer. Leaf lesions often start at the tip or leaf margin. When it is wet, it expands rapidly, and the corruption is dark and the edges of the lesions are unclear. A special odor of spoilage was given. A white mold formed on the edge of the leaf. A thick white mold grew on the back of the leaf, forming a mold wheel. When the weather is dry, the lesions are brown and dry, and there is no white mold on the back of the leaves. The humidity in the field is large, and there is dew, morning and evening, often rainy, and the temperature is not lower than 10°C. The occurrence of late blight is heavy.
Control methods:
Before and after the flowering of the potato, after the central diseased plant was found in the field, the deep burial was immediately removed and sprayed with medicament for prevention and treatment. Can use Kelu 100g/mu evenly sprayed in the whole field to prevent and prevent prevention and control. Use 40 grams per acre to spray the spraying interval of 5-10 days. Use 7-10 days under normal weather conditions. Medication, 25% metalaxyl WP 800 times, or 65% dexamethasone WP 500 times, 64% WP WP 500 times, 40% EB aluminum WP 500 times, 75% chlorothalonil WP 600-800 times spray. Spray once every 7-10 days, spraying 2-3 times. If there is little rain, the number of days between spraying can be appropriately extended.
In high humidity and rainy conditions, it should be administered once every 5 to 7 days. According to the size of the risk of illness can be adjusted to adjust the number of medication.
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