Technical points for prevention and control of several pests and diseases in wintering, cucumber and melon 1. Downy mildew: In the case of low-lying and poorly-ventilated watering, the damage is more serious, mainly affecting the leaves, and occasionally damage the stems and pedicels. At the beginning of the disease, there are water-stained polygonal lesions, and the lesions are not perforated. When the humidity is high, the surface lesions may grow black mold layer. In severe cases, the number of lesions is large, the expansion is fast, and the lesions heal each other, causing the leaves to die early. . Control method: ecological control: keep indoor ventilation well, control the temperature in the room, keep at 25 degrees during the day, and control at 15 degrees at night. Chemical control: When the disease is on, use 25% metalaxyl WP 800 times solution, 25% toxic bacterium 600-800 times solution, or 25% metalaxyl manganese Zn 500-600 times solution. Repeat the spray once every 3-5 days. 2, powdery mildew: damage to the plant parts of the ground, but mainly affected by leaves and vines. On the two sides of the initial leaves, white near-round small pink spots appeared, and then expanded into large white powder areas with inconspicuous edges. In severe cases, the whole leaf is covered with white powder. At the end of the disease, the white mold spots become gray due to the hyphae, and the diseased leaves are yellow and have small black spots. Control methods: field management: try to use disease-resistant varieties, pay attention to light transmission, reasonable irrigation, reduce air humidity, and apply organic fertilizer. Chemical control: In the initial stage of the disease, use 15% powder rust 1500-2000 times liquid, or 40% cefenone 800 times liquid spray, spray once every 5-7 days, repeat 2-3 times. 3, gray mold: mainly harm leaves, fruits, flowers, etc., gray mold pathogens invade from the female flowers, the sapphire layer grows, and then invade the young melon, causing the top to rot, softening and shrinking, the melon suffers The diseased department first turns yellow until it rots and falls off. Control methods: field management: high wow cultivation, reduce field humidity, reasonable irrigation, watering in the evening, appropriate ventilation and drainage, to promote its robust growth. Chemical control: In the early stage of the disease, spray with 50% speed Keling WP 1500-2000 or 50% moldy WP 800-1000 times. 4, anthracnose: mainly damage stems, leaves and so on. At the beginning, there were small spots of water immersion, the lesions of the leaves were nearly round, reddish brown; there was a halo outside, and the middle part of the lesion ruptured when dry. The fruit is damaged by dark brown spots and is easily deformed. Control method: Soil treatment: Rotation with non-melon crops for more than 3 years. Soil disinfection, selection of resistant varieties, rotation for dumping, removal of sick plants, and application of phosphorus and potassium fertilizer. Chemical control: 65% mancozeb 500-800 times solution, 80% anthrax Fumex wettable powder 800 times solution, 70% mancozeb WP 400 times solution or 45% chlorothalonil aerosol agent per acre 250 Ke fumigation. Use once every 7-10 days for 3-4 consecutive times. 5, blight: the disease is extremely harmful in the case of continuous cropping, generally occurs at the beginning of the harvest period, but also occurs in the seedling stage. Mainly adopt comprehensive prevention and control. Rotating the land, deepening the land, increasing the application of farmyard manure, using small sorghum cultivation, properly controlling fresh water, strengthening cultivating loose soil, using pumpkin as a rootstock for grafting and soil treatment (mixing 2.5 kg per 667 square meters with fine soil) Evenly, when planted, sprinkle around the bandits and then seal the soil). It can also be controlled by 64% bacteria and 600 times liquid. 6, pests: there are aphids, whitefly, killing jaundice and so on. The locusts kill and kill cockroaches, 10% imidacloprid, killing cockroaches, etc.; white powder mites are treated with chlorpyrifos, kungfu, etc.; jaundice is controlled by dicofol. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone Hotel Safe,Guest Room Safe,Mini Safe Box,Digital Safe Box Hebei Yingbo Safe Boxes Co.,Ltd , https://www.yingbosafebox.com