Cucumber downy mildew is the main disease in the production of cucumber in the solar greenhouse. The disease has a large area and spreads quickly. If the preventive measures are not properly implemented, it will result in reduced production or even no harvest. If comprehensive preventive measures are used in production and scientific cultivation and management techniques are adopted, the probability of occurrence of diseases will be greatly reduced. First, the shed is strictly sterilized. 7 days before colonization, sheds were sealed and sealed, high-temperature stuffy sheds were used to kill the pathogens on the ground surface and scaffolds, or sulfuric powder 2-3kg per 667m2 and 50% dichlorvos 25ml were mixed with sawdust to ignite and ignite. Second, master the critical period of disease prevention. The first critical period is at the seedling stage: the plant resistance is weak during the nursery, and it is susceptible to bacterial infections. A protective fungicide is sprayed and the disease-free seedlings are selected for planting; the second critical period is the establishment of the seedling-sustained seedling stage: Accelerated growth, downy mildew prone to occur, should be protected spraying; the third key period in the early flowering period: after flowering, plant vegetative growth and reproductive growth go hand in hand, should be sprayed fungicide; the fourth key period in the harvest Prosperous period: During the harvest period of cucumbers, the number of waterings is significantly increased. The humidity in the greenhouse is high. Before the watering, the plants must be sprayed and prevented. The diseased plants are immediately used and the pathogens are eliminated at the early stage of disease. Third, control the appropriate temperature and humidity. High-temperature and high-humidity environment is an important factor in the occurrence of downy mildew. When the temperature reaches 16-22 °C and the relative humidity is above 83%, it is easy to attack. Therefore, proper control of temperature and humidity is the key to prevent the occurrence of diseases. The daytime temperature during entering the melon period is 25-32°C, not more than 35°C, and 18-16°C at night, not exceeding 22°C. At the same time do a good job of ventilation and dehumidification work, sunny days after watering to release air and humidity, even if the cloudy days have to ventilate, so that the greenhouse air humidity is maintained at 50-60%. Fourth, prevention and control of agricultural measures. Select disease-resistant varieties to cultivate disease-free and strong seedlings; apply NPK fertilizer and micro-fertilizer in combination with carbon dioxide gas fertilizer; adopt drip irrigation or under-membrane under-irrigation technology to reduce surface evaporation and reduce greenhouse humidity; complete indoor walls, The sterilization and disinfection of the tool, cutting off the source of infection, etc. can reduce the occurrence of diseases. Fifth, prevention and control of physical measures. Downy mildew bacteria stop at 42°C and can be killed by high temperature stuffy shed method. The specific method is: Select the closed room at sunny noon, so that the temperature rises to 44-46°C for 2 hours. The bactericidal effect was not obvious below 42°C. Plants above 48°C were vulnerable. After 2 hours, the plants were released and the humidity was removed. This method is simple, effective and easy to manage. Sixth, scientific and rational drug use. (1) The protective bactericide is used interchangeably with the systemic bactericide to avoid long-term single use. Good protective bactericides include mancozeb, chlorothalonil, and good bactericidal agents such as B-aluminum, anti-viral drugs, Kekangling, and DuPont Kelu. (2) Correct compounding and mixing of various agents to expand the scope of sterilization. A mixed formulation for protecting against downy mildew: mancozeb mixed with carbendazim 2:1; mancozeb mixed with formazan 4:1; chlorothalonil mixed with formazan 5:2. A mixed-use formula for the therapeutic effects: Mancozeb mixed with BPA: 2:1; Metalaxyl and Won Cu: 1:3 mixed; Mancozeb mixed with metalaxyl 5:1. (3) Grasp the appropriate amount of drug, can not arbitrarily increase the concentration of application, and control the number of applications, the interval is 7-10 days, 2-3 times per month is appropriate. (4) Improve spray technology. Choose to spray on a sunny morning, the temperature of 20-25 °C, relative humidity 70-75% when the effect is good. Central diseased plants and the surrounding key sprays, the upper part of the plant susceptible to spray. The front and back of the blade should be sprayed to achieve uniform, comprehensive and detailed.
Chongqing "Terson" Coptis", Department of Chongqing Shizhu Tujia Autonomous County specialty, China National Geographic Indications (native geographical products). Produced in Shizhu County Huangshui National Forest Park, also known as "Coptis". Ranunculaceae Coptis Coptis chinensis Franch dry rhizomes, medicinal products "taste even", Department of commonly used precious Chinese medicine, Shizhu County is the original production of Coptis, Coptis town, the production of Because of good quality, was identified as "Sinopharm" "Authentic Coptis".
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