The watermelon leaf blight often occurs rapidly in the late and late rainy season or after rainstorm, which can make a lot of leaves brown and scorch, and the loss is serious. Therefore, we must do the following.
Control measures: 1. Select disease-resistant varieties, implement crop rotation, remove field residues, and spray a new high-fat membrane to form a layer of polymer membrane isolation bacteria to reduce the bacteria source. 2. Increase the amount of fully fermented organic fertilizer, according to the growth of watermelon, nitrogen, phosphorus, potassium 2.83:1:3.4 ratio of fertilization, combined with the use of photosynthetic film fertilizer, enhance plant resistance to disease. 3. Seed treatment: seed dressing with new high-fat membrane before sowing, can be heat preservation, moisturizing, swelling, increase seed germination rate, so that seedlings robust. Repel underground pests and isolate virus infections. Can also be mixed with seed coating agents.
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