Three methods to prevent cucumber downy mildew in the greenhouse

With the growing area of ​​greenhouse vegetable planting, cucumber downy mildew is also frequently affected. The disease, commonly known as "fire dragon lice," "dry leaves," and "running horses," is a type of chronic leaf disease that seriously damages the greenhouse cucumber. At the seedling stage, the leaves gradually chlorosis, yellow, and finally withered; at the adult stage, water spots begin to appear in the veins, and then gradually become yellow spots. After the lesions expand, they are polygonal and damp due to vein limitation. When the leaves on the back of the lesion grow gray mold layer. When the conditions are suitable, the disease spreads quickly, generally reducing production by 20% to 30%, and when serious, it can reach 50% to 60% or more. Its prevention and control methods are:

1. Spray method. In the early stage of disease, use 70% eth phosphine MnZn WP 500 times, 72.2% Proclex 800 times, 58% metalaxyl MnZn WP 500 times, 40% EB aluminum wettable powder 200 times liquid, 64% anti-virus WP 400 times or 75% chlorothalonil wettable powder 600 times, spray every 3 to 5 days, even spray 3 to 4 times.

2. Smoke method. In the early stage of disease, 45% of chlorothalonil smoke agent 200-250g or 15% of epidemic smoke-smoke agent is used per acre, and evenly divided into 4 to 5 places in the shed. After being lit, the shed is covered and smoked overnight. Two days early morning ventilation.

3. Dust method. In the initial stage of disease, 1 kg of chlorothalonil (or 5% Garrinon, 10% anti-mold, etc.) dust agent was sprayed per acre and sprayed once every 10 days or so.

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