The active ingredient of Bordeaux mixture is basic copper sulphate. After spraying the liquid, a thin film is formed on the surface of plants and bacteria. The film is insoluble in water, but it plays a role in carbon dioxide, ammonia, tree and pathogen secretion. Under the gradual increase of soluble copper ions and bactericidal action, it can effectively prevent spore germination, prevent infection of the bacteria, and promote the green color of the leaves, grow robust, and improve the disease resistance of the tree.
Main ingredients: Bordeaux mixture has two kinds of dosage forms: equal weight and half volume. The main ingredients are copper sulfate, quicklime and water. The proportion and the amount of water added should be determined according to the sensitivity of the tree species or vegetable varieties to copper sulphate and lime (less copper sulphate sensitive to lime, less lime sensitive to lime) and the control object, season and temperature. Bordeaux mixture ratio commonly used in production: Bordeaux liquid lime equivalent (copper sulfate: quicklime = 1:1), half amount (1:0.5) and multi-type (1:3-5). Water is generally 160-240 times.
Preparation method: dissolve copper sulfate by boiling water (boiling water), dissolve the quicklime with cold water, and after completely dissolve, then slowly pour both into the spare container and stir constantly. Or slowly pour the copper sulfate solution into the milk of the lime, and stir it to form a Bordeaux mixture. However, it is not allowed to pour the lime milk into the copper sulfate solution, otherwise the quality is not good and the control effect is poor.
More Bordeaux liquid configuration, please pay attention to China Pesticide Network
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