Muskmelon, also known as melon, fruit melon. The color, smell and taste are all superb and nutritious. It is the fruit that the majority of consumers like to eat. In recent years, with the deepening of the adjustment of agricultural structure, melon has been growing with a high yield and good sales market. The cultivation area in my county has expanded rapidly, and has been planted from spring to winter. There are open field cultivation, greenhouse cultivation, and greenhouses. Cultivation and other ways. However, I found out in my work practice that the occurrence of downy mildew in melons in our county was relatively common, and the damage was relatively large, especially in summer and autumn when open field cultivation was heavy, and those who were mildly severely reduced production. The law of occurrence of the disease and comprehensive prevention measures are described as follows: First, the symptoms of damage. 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. Second, the incidence of law. The disease is a fungal disease caused by the infection of Pseudoperonospora. The main damage melons, cucumbers and other fruits and vegetables. 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. Diseased leaves appear 2-3 days after the disease, quickly spread under suitable conditions, spread, 7-15 days can cause all field leaves dead, melon farmers commonly known as "running horse dry." The disease usually begins in May-June in the greenhouse in early spring or in greenhouses such as melon and cucumber. In July and August, it recurs in melons and cucumbers. Third, prevention and control methods 1, agricultural control. Select disease-resistant varieties to avoid continuous cropping with fruits and vegetables, rational irrigation and drainage, and control of 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. 2, nutrition control. After muskmelon blooming, mu 0.2kg urea, white sugar (or brown sugar) 0.5kg, spraying 40-50kg of leaf on the water, once every 5-6 days, spray 4-5 times, or use "Gaomeishi" for mu. UA-102 nutrient "organic active liquid fertilizer 500 times 50-70kg sprayed on foliar and root soil, 7-10 days 1, even spray 2 times, in order to enhance plant resistance, prevent disease; also available 3kg quicklime Water 50kg, soaked for 24-48 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, plant sterilization. At the beginning of the disease, 0.2kg per acre of small pointed pepper, ginger or garlic is crushed and wrapped in gauze. After putting it into 50kg of water, the sap will be filtered out, sprayed after mixing, sprayed after 3 days, and then sprayed every 7 days. Times, spray 2-3 more times. 4, chemical control. After melons have entered the flowering stage, the disease resistance is reduced. The application of the pesticide should be started earlier, and 37% carbendazim oxalate (wither rick) soluble powder 800 times, 70% zeocin WP can be used first. 600 times liquid, 50% acetaminophen 1500 times, 50% methicone wettable powder 700 times, 72% WP 500 times, 72.2% water 800 times, 90% phytophthora Spirit 400 times liquid and other 50-70kg spray, once every 7-10 days. Diseased leaves or diseased plants were found at the peak of July-August and were immediately sprayed with 72% agricultural streptomycin 3000-4000 times liquid and 50-60kg sprayed 2-3 times.
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