After Bordeaux liquid sprayed on the surface of winter jujube seedlings, a protective film was formed on the surface of the leaves. The membrane was covered with free copper ions. After the cells or pathogens were exposed to copper ions, the copper ions could penetrate into the cells and bind to the enzymes, thus losing them. Activity and vitality. It has a long-lasting effect, is resistant to rain, and has a wide range of disease prevention. It has the best effect before spraying. Continuous use of pathogens is not easy to produce drug resistance, and it is the most widely used inorganic copper fungicide on winter jujube seedlings. Because Bordeaux mixture is alkaline, and different jujube trees have different sensitivities to copper ions and lime in different phenological periods, improper use may cause phytotoxicity. Winter jujube seedlings should pay attention to the following matters when using Bordeaux mixture:


 1. Sterilization principle of Bordeaux mixture After spraying Bordeaux liquid on the surface of plants, a protective film is formed on the surface of the plant. The membrane is covered with free copper ions. After the cells or pathogens are exposed to copper ions, copper ions can penetrate into the cells and The enzyme binds, thus losing activity and vitality. However, the pathogenic bacteria that have invaded plants are less lethal.


2, the preparation of Bordeaux liquid preparation of Bordeaux liquid is: copper sulfate, quicklime, water, to choose the blue color, shiny copper sulfate crystal, green or red impurities should not be used; choose white block of fresh high quality lime. The ratio between the raw materials is 1:2 - 3:200-400, that is, 1 part of copper sulfate, 2-3 parts of quicklime and 200-400 parts of water.


Preparation method: place copper sulfate and quicklime in a non-metallic container, use a small amount of hot water to open, pour one-third of the water into the lime liquid, and pour two-thirds of the water into the copper sulfate solution. Then, the copper sulfate solution is slowly poured into the milk of the lime, and the mixture is stirred while being poured to make the liquid appear sky blue, that is, the preparation is completed.


3. Application of Bordeaux mixture on jujube trees Before the flowering of jujube trees, 7 days after spraying insecticide, bactericidal and antiviral drugs, the use of copper sulfate: lime: water = 1:3:400 of Bordeaux liquid spray can prevent anthracnose Invasion of pathogens such as rust; in early July, after the jujube fruit entered the expansion period, use 1:2:300 Bordeaux mixture, anti-shrinking disease, anthracnose, etc.; in August, the jujube fruit entered the expansion stage with 1:2:200 Bordeaux Liquid anti-anthrax and brown spot.


4. Matters needing attention When preparing Bordeaux liquid, it is necessary to pour most of the copper sulfate solution into a small amount of lime milk. Never pour the lime milk into the copper sulfate solution, otherwise it will precipitate, reduce the efficacy and cause phytotoxicity. .


5, the preparation of Bordeaux mixture, if used with copper sulfate in excess, easy to produce phytotoxicity. The lime content is relatively safe, and the adhesion is strong, and the effect is long lasting, but the bactericidal effect is slowed down and the control effect is reduced. On the contrary, the amount of lime is small, the efficacy is accelerated, the control effect is improved, and the phytotoxicity is relatively increased. Bordeaux mixture should be used as needed, and should not be placed for more than 24 hours.


6. Application on winter jujube seedlings: Pear scab, leaf anthracnose, fire blight, spray 1:2:200 times Bordeaux before flowering and after flowering, then spray once every 15-20 days To protect inflorescences, young shoots and leaves; pear rust, brown spot disease spray 1:2:160~200 times Bordeaux mixture in the germination stage, then spray once every 10 days, spray 2-3 times continuously; pear black Spot disease in the late April to early July, spray 1:2:160-200 times Bordeaux mixture, then spray once every 10 days, spray 7-8 times continuously; pear dry blight in the winter jujube seedling growth period, spray Multi-type 200 times Bordeaux mixture.


    The management technology of the above winter jujube seedlings is provided by the friendship of Zhangzhou Yongcheng Jujube Planting Co., Ltd. To learn more about the winter jujube seedling planting technology, the winter jujube seedling management method, the winter jujube seedling price, etc., please visit the website: http://www.bfzao .com inquiry, I hope to help you grow winter jujube seedlings.