Cucumbers in the greenhouse should pay attention to the downy mildew
November is the peak period of cucumber downy mildew in solar greenhouse. Cucumber downy mildew mainly harms the leaves. The lesions are polygonal due to the restriction of veins. They are light brown or yellowish brown, and the leaves are dry, resulting in reduced yield. Therefore, we must do the following prevention and control measures.
Control measures: 1. Agricultural control, the suitable temperature for the incidence of downy mildew is 15 ~ 22 ° C, the relative humidity is higher than 83%, the leaves are prone to disease when there are water drops. It should be kept in the pastoral clean, reasonably dense planting, high ridge cultivation; under-film dark irrigation or drip irrigation, ventilation and drainage at noon; 2. Rational fertilization, increased application of phosphorus and potassium fertilizer, foliar application of photosynthetic nutrient film fertilizer, can help plants absorb a lot of light Fertilizer, light energy, light, compatible with conventional fertilizers, nutrients supply plant growth and development to the limit, to ensure the growth of strong seedlings. 3. Chemical prevention and control, before the onset, a new high-fat film can be sprayed to form a polymer film, which can keep warm, moisturize, prevent disease and deworm. Filter plant respiratory impurities, prevent pollution, and inhibit viral infection. Immediately after the emergence of the central diseased plant in the field, the drug should be sprayed with a highly targeted agent in combination with a new high-fat film to improve the control effect.
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