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Watermelon leaf blight is rapidly occurring in the middle and late stages of watermelon growth, rainy season or heavy rain, which can cause a large number of leaves to become brown and have serious losses. Therefore, we must do the following measures.
Control measures: 1. Select resistant varieties, implement crop rotation, remove the residuals of the diseased plants in the field, and spray a new high-fat film to form a polymer membrane to isolate the bacteria and reduce the bacterial source. 2. Adding fully fermented and decomposed organic fertilizer, formulating the fertilizer according to the ratio of nitrogen, phosphorus and potassium in the ratio of 2.83:1:3.4, and using photosynthetic nutrient film fertilizer to enhance the disease resistance of the plant. 3. Seed treatment: seeding with new high-fat film before planting, can keep warm, moisturize, swell, improve seed germination rate, and make seedlings strong. Repel underground pests and isolate viral infections. It can also be mixed with a seed coating.
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