Bordeaux liquid is a broad-spectrum protective and low-toxic bactericide prepared from copper sulfate (blue cedar), quicklime and water according to a certain proportion and method. Its active ingredient is mainly basic copper sulphate. When Bordeaux spray is sprayed on the surface of the plant, a protective film is formed on the surface of the plant. The free copper ion is covered on the membrane. After the bacterial or pathogen contacts the copper ion, the copper ion can infiltrate into the cell and bind to the enzyme, thereby losing its activity. And vitality. It has a long effective period, is resistant to rain erosion, and has a wide range of disease prevention. It has the best effect before the onset of disease. Continuous use of bacteria is not easy to produce drug resistance.
Bordeaux mixture preparation materials are: copper sulfate, quicklime, water. Copper sulfate should be selected from blue-blue, shiny crystals, green or red impurities should not be used; quicklime to choose the white block of fresh high-quality lime block. Lime-fold Bordeaux mixture is mostly used on jujube trees. The proportion of preparation is generally: copper sulfate: quicklime: water = 1:2 to 3:200-240.
Bordeaux fluids are usually formulated in the following two ways:
1. Two-liquid equivalent preparation method (two-liquid method): Take high-quality copper sulfate crystals and quicklime, dissolve the quicklime with a small amount of water and a small amount of hot water to dissolve copper sulfate, and then add half of the total amount of water, respectively, to prepare a copper sulfate solution With lime milk, when the temperature of the two liquids is equal and not higher than the ambient temperature, the two liquids are slowly poured into the third container at the same time.
2. Dilute copper sulfate solution into thick lime milk preparation method (copper thick ash method): Dissolve copper sulfate with 90% water, dissolve lime (mix into lime milk) with 10% water, and then slowly dilute the copper sulfate solution Pour into thick lime milk (better spray into lime milk) and pour it in while stirring. Never pour lime milk into the copper sulfate solution, otherwise it will produce a large amount of precipitation, reduce the efficacy, and cause phytotoxicity.
Bordeaux liquid can be used to prevent rust, anthracnose, ringworm, brown spot, gray leaf spot, leaf blight, and other fungal diseases on jujube trees, and has a certain preventive effect on bacterial ulcer disease. The drug is a protective bactericide. It is best to use drugs before the invasion of the bacteria, and the spraying should be even and thorough. The spraying interval is generally about 15 days. In general, before jujube blooming, spray Bordeaux solution for 7 days after spraying insecticidal, bactericidal and antiviral drugs can prevent the invasion of pathogens such as anthrax and rust. After jujube fruit enters inflated stage in early July, Bordeaux spray is used to prevent fruit shrinkage. Diseases, anthrax, etc.; in late August, the jujube fruit enters inflated with Bordeaux fluid for rust, anthrax and brown spot.
It should be noted that: Bordeaux liquid preparation, avoid excessive copper sulfate, otherwise it is easy to produce phytotoxicity. Lime content is relatively safe, strong adhesion and long-lasting efficacy, but the bactericidal effect is slowed down and the control effect is reduced. Bordeaux mixture cannot be mixed with other pesticides to avoid phytotoxicity or affect efficacy. The prepared liquid medicine is prone to produce precipitation for a long time, which affects the efficacy of the medicine. It should be used nowadays and metal containers should not be used. Use under rain, humidity and high temperature and drought conditions may produce phytotoxicity. It should not be used within 1.5 months before fruit harvest to avoid contaminating the fruit surface. Bordeaux fluid should be used with the device. The storage time should not exceed 24 hours.
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