Autumn and winter are good seasons for eating spinach. This year is warm winter. Because of its high nutrient content, spinach is also good. However, even the rainy and snowy weather caused frequent spinach disease, and the phenomenon of spinach downy mildew was serious. It reminded the friends of the vegetable to be careful to prevent and treat them. How do you choose a fungicide after the spinach suffers from downy mildew?
Performance symptoms
The main damage of spinach downy mildew is the leaves. The lesions are initially pale green dots, the edges are not obvious, and they are irregularly shaped after expansion. They vary in size and are 3 to 17 mm in diameter. When the humidity is large, the lesions on the back of the leaves are produced. Grayish white mold layer, which turns grayish purple. The lesion spreads 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. The whole plant with heavy disease turns yellow and die, and the vegetable plants are atrophic.
Control method
At the beginning of the onset of spinach, it is suitable to spray 80% aluminum triethylphosphonate 500 times solution, or 64% frost·manganese zinc wettable powder 500 times liquid, or 58% metalaxyl · manganese zinc 500 times liquid, or 72.2% downy mildew. Weijing hydrochloric acid 800 times liquid, etc., once a week, continuous control 2 to 3 times, which can effectively control the downy mildew hazard.
When the disease is serious, the concentration of the liquid can be appropriately increased when spraying. It should be noted that it should not be excessive to prevent phytotoxicity, and it can be combined with spraying vegetable foliar fertilizer for prevention and treatment. In the process, a plant growth regulator that regulates the nutrient distribution of vegetables can also be suitably used as a supplement.
Spinach seriously ill areas must be rotated for 2 to 3 years, strengthen cultivation management, achieve appropriate density, scientific irrigation, reduce field humidity, so that the prevention and control of spinach downy mildew has a good effect.
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