1. Hazardous symptoms The disease mainly damages melon leaves, and it affects the top down. In the early stage of disease, pale yellow patches appeared between leaves and veins, and after the development continued, there appeared polygonal yellow patches restricted by the veins and the leaves were frosty moldy. The lesions curled upwards for a long time, and they quickly burnt and dried. The melon vines dried up and died from the bottom up.
2. Incidence of the disease The disease is a fungal disease caused by Pseudoperonospora infection. The main harm melon, cucumber and other melons and fruits. When the relative humidity of air in the field reaches more than 80%, it is beneficial to the onset of disease and produces a large amount of pathogenic spores. The spores of the pathogen continue to be transmitted by air flow, water flow, and field operations. The lesions appear 2 to 3 days after the leaves are infected. They spread rapidly and spread under suitable conditions. The leaves of the whole field can be dead in 7 to 15 days. The melon farmers are commonly called as horses. The disease usually begins in May-June in the early spring greenhouse or on the greenhouse melons and cucumbers. It recurs in the open melons and cucumbers from July to August.
3. Control methods
3.1 Agricultural control Select disease-resistant varieties, avoid continuous cropping with fruits and vegetables, reasonably drain irrigation, and control field humidity. Appropriate fertilization, organic fertilizer application, and chemical fertilizer application of nitrogen, phosphorus and potassium. The plant is planted in a reasonable and timely manner, with pruning in time to prevent overgrowth of plants and improve ventilation and light transmission.
3.2 Nutritional control After melon blossom, 667 square meters use 0.2 kg of urea, 0.5 kg of white sugar (or brown sugar), and spray 40 to 50 kg of water on leaves, once every 5 to 6 days, and spray 4 to 5 times, or 667 square meters of organic active liquid fertilizer such as Gaomei UA-102 nutrient and other 50 to 50 kg of liquid 50 to 70 kg sprayed on the foliage and root soil, 7 to 10 days 1, even spray 2 times to enhance plant resistance, prevention Incidence; can also be used 3 kg of lime 50 kg of water, soak for 24 to 48 hours, filtered liquid spray, both bactericidal, but also promote root absorption of nutrients and nutrients in the body of the operation, utilization, and enhance disease resistance.
3.3 At the early stage of bactericidal attack, 667 square meters of small tip pepper, ginger or garlic were each crushed in 0.2 kg, wrapped in gauze, placed in 50 kg of water to filter out juice, sprayed after mixing, and sprayed again after 3 days. Then spray once every 7 days, and then spray 2 or 3 times.
3.4 Chemical control Melon enters the flowering stage and the resistance to disease is reduced. It should be started before the application of the drug can be used 37% carbendazim oxalate (wilted rick) soluble powder 800 times, 70% zeocin Wettable powder 600 times liquid, 50 grams of pueraine 1500 times, 50% Amethyst copper WP 700 times, 72 cages WP 500 times, 72.2% Proplex 800 times, 90 times % Phytophthora, 400 times liquid and 50-70 kg spray, every 7 to 10 days 1 time. The diseased leaves or diseased plants were found at the peak of onset in July-August and immediately used 72% of agricultural streptomycin 3000-4000 times of liquid, 50-60 kg of continuous spraying 2 or 3 times.
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