Spring to prevent the epidemic of spinach downy mildew

Spinach downy mildew is an important disease that harms spinach. I. Symptom recognition mainly damages the leaves. The lesions are pale or yellowish-green dots at the beginning of the lesion. The edges are not obvious. After the enlargement, they are irregularly shaped, with different sizes and diameters ranging from 3 to 17 mm. The diseased leaves develop from the lower part of the plant to the upper part. When the drought occurs, the diseased leaves are yellow, and when the humidity is high, a gray and white mold layer is formed on the leaf spot of the back lobe, and then turns grayish purple and more rots. In severe cases, the lesions are linked and the leaves turn yellow and die. Some vegetables are shrinking. Second, the incidence of the disease caused by fungal infection. The pathogenic bacteria used hyphae to pass winter on spinach or wintering vegetables, or on seeds, or in the leaves of diseased plants with oospore. Spores are produced in late spring and spread through air currents, rainwater, agricultural tools, insects, and agricultural operations. It is easy to occur and prevail at low temperature and high humidity conditions. Debris, dew exposure, continuous cropping, low-lying or poorly-drained land, with severe disease, poor fertilization, weak growth, or over-grown vegetation, poor ventilation, and high incidence; watering, or non-winding or release of wind in protected areas Timely, or not clean, the incidence is also heavy. Third, prevention and control technology 1, agricultural control: the implementation of severe disease areas and other vegetable rotation for 2 to 3 years; early spring in the spinach field found diseased plants, timely removal, took out of the field burned; from disease-free or from disease-free strains; Decompose organic fertilizer, increase phosphorus and potash fertilizer; appropriate planting density, timely drainage in rainy days, strengthen ventilation in protected areas, achieve watering in sunny days, do not water in rainy days, cloudy days, and not flood irrigation, strengthen the protection of spinach after watering Exhale and loosen the soil and reduce the humidity in the field. 2. Smoke prevention and control: Smoke from spinach used in protected areas is cheap, labor-saving, and water-saving. Before onset, 30% or 45% chlorothalonil smoke agent can be used, with 200-250 grams per acre. The shed can be smoked in the early evening. At the beginning of the disease, 15% of downy mildew smoke can be used, and 250 grams per acre can be used. Smoked once a day, even smoked 3 to 4 times. 3. Chemical control: At the beginning of the disease, 1:1:300 Bordeaux fluid, 70% EB aluminum manganese zinc wettable powder 400 times, or 58% metalaxyl manganese zinc wettable powder 500 times, or 72.2% Precloxone 800 times liquid, or 72% Kelu wettable powder 600 ~ 800 times liquid, 64% antivirus WP 500 times, every 7 ~ 10 times, continuous control 2 ~ 3 times. Pay attention to stopping the drug administration 10-15 days before harvesting. If the disease develops later in the growth period, it should be harvested and marketed in time. Do not spray.

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