Cucumber downy mildew, angular leaf spot, powdery mildew is the main disease causing cucumber yield reduction. In order to reduce the pollution of chemical pesticides, pollution-free pesticides should be used as much as possible. The preparation methods of several pollution-free pesticides are described below. First, black sugar M enzyme method Black sugar pesticide is a pollution-free pesticide for controlling various diseases such as cucumber leaf spot, downy mildew and powdery mildew. Its synthetic components do not contain toxic substances, can be absorbed by the leaves, enhance the physiological activity of the leaves, increase the effective bacteria, promote the photosynthesis of the leaves, and produce more sufficient nutrients, so that the plants have stronger resistance to pathogenic bacteria. Prevent the invasion of harmful pathogens. The preparation method is: black sugar (black sugar can also be) 4 kg, bio-M enzyme 300 g, boiling water 9 kg, and a clean porcelain jar (15 kg pack). Wash the porcelain jar first (preferably disinfect), dry it, pour the black sugar into the tank, then add boiling water to completely dissolve the sugar. When the temperature of the soup drops below 30C, slowly add the enzyme and gently stir it to mix well. Then, use a sterile bleaching cloth, seal the can lid, place it in a warm place (18-35 ° C), stir once a day, and add the appropriate amount of edible vinegar (about 5 mL) during the first stirring. , 5-10 days of fermentation showed foam. As the new body continues to produce and the enzymes meet, the surface of the nutrient solution first appears white spots, and then a layer of white film is formed, which is made into a black sugar pesticide stock solution, the efficacy period is 3 months, can be placed in the shade Store at the site and dilute 1000 times when spraying. Second, sugar wine vinegar M enzyme method Sugar wine vinegar pesticides can control a variety of pests and diseases of cucumber. It can also control gray star disease and black star disease in fruit trees. The production method is simple and the effect is good. Production of Fangde will mix AM biological bacteria solution (product of Gansu Dasheng Bioengineering Research Institute), brown sugar, white wine (above 30 °C), vinegar and water in a ratio of 1:1:l:l:10, and mix the mixture. Put it in a polyethylene plastic container, cover the lid tightly, and put it into a room temperature fermentation at room temperature. Make sure that the temperature of the solution does not exceed 40 ° C. After a few days, the fermentation broth will generate gas and the container will bulge. At this time, loosen the lid, release the gas, and then immediately cover it. Gas should be placed every 3d after the first gas generation. If the gas is no longer produced, it indicates that the fermentation has been completed and the pungent vinegar smell can be smelled. The fermentation time is about 20-30 days in the winter. The sealed shelf life at room temperature is 2-3 months. If the smell of leaven disappears, it indicates that it has expired. The standard dilution factor for controlling pests and diseases is 1000 times. If the effect is not obvious after spraying, the dilution factor can be gradually increased to 50-200 times, and the young leaves and seedlings should not be lower than 800 times. Both sides of the leaves, young stems must be sprayed. The most basic purpose of using the preparation solution is to prevent the occurrence of pests and diseases, and should be used as soon as possible. If the pests and diseases occur in large quantities, the effect will be unsatisfactory. Third, urine sugar liquid In the middle and late stages of cucumber growth, if the fertility is poor and the growth is weak, symptoms of malnutrition will appear. It has been reported that the ratio of the concentration of nitrogen sugar in the juice of cucumber plants falls below 2, which is prone to downy mildew; if the ratio of juice concentration is increased to 2.2 or more, the occurrence of downy mildew can be prevented. According to the test, the resistant varieties have high sugar content, while the susceptible varieties have low sugar content. Therefore, some people call downy mildew a "low sugar" disease. Therefore, by supplementing nutrition, the purpose of prevention and treatment can be achieved. According to the test, urea 0.2kg of ten sugar (white sugar, brown sugar can be used) 0.5ks ten water 50ks. In the period of growth, spray once every sd, spray 4-5 times continuously, the control effect is about 80%. It is usually sprayed in the morning, sprayed on the back of the leaf, and used on susceptible varieties. Clinical&Analytical Instruments Microplate Incubator,Analytical Instruments,Disposable Sampling Tube Kit,Clinical Chemistry Reagents Guangdong Widinlsa International Co.Ltd , https://www.widinlsamachine.com