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Bordeaux mixture is the earliest protective fungicide discovered and applied. It is prepared from copper sulfate and lime milk. The main component is basic copper sulfate. Because different fruit trees are sensitive to lime and copper, they must be used scientifically to achieve the best results.
First, it must be properly formulated. When the Bordeaux mixture is prepared, the amount of water is divided into two equal parts. One part of water is used to dissolve copper sulfate, and one part is used to prepare lime milk. After the copper sulfate is fully dissolved, the copper sulfate solution is slowly poured into the lime milk and then Stir well, can be formulated into the best suspension of Bordeaux mixture; Bordeaux mixture is prepared in equal, half and multiple forms, the ratio of copper sulfate to quicklime is 1:1, 1:0.5 and 1:2, water can be increased as needed, generally 100 times and 200 times; good quality Bordeaux liquid is sky blue. Bordeaux liquid should be used with it. Due to its corrosive effect on metals, do not use metal containers when preparing.
The second is to identify the target of prevention and treatment. Bordeaux mixture is a protective fungicide. It should be used before the invasion of the bacteria. Apples, persimmons and other tree species are sensitive to copper. It should be used in multiple or multi-type; pears and grapes are sensitive to lime, and half-quantity should be used; Sensitive, not suitable for use. Bordeaux mixture is mainly used to control grape downy mildew, black pox disease, anthracnose, apple anthracnose, ring disease, early leaf disease and pear black spot disease.
The third is to use the concentration reasonably. The concentration requirements of Bordeaux mixture are also inconsistent in different growth stages and different climatic conditions. Generally, the early stage plants are young, the drug resistance is weak, and the use concentration should be low. For example, the grape black pox disease can be controlled. In the early stage, the Bordeaux mixture with copper sulfate, quicklime and water ratio of 1:0.5:240 can be used. In the later stage, 1:0.5,180 should be used. ~200 times Bordeaux mixture; pear and grape in the dry season generally use copper sulfate: quicklime: water: 1:0.5:150 ~ 200 Bordeaux mixture, in the rainy season with 1:1: 150 ~ 200 times Bordeaux mixture.
The fourth is to apply correctly. Bordeaux mixture is unstable. When spraying, it should be applied when the leaves are clear without water. Avoid spraying on the wet days or before the dew is dry, so as to avoid phytotoxicity. The effect period of Bordeaux mixture is 10 to 15 days. After 20 to 30 days, it is not advisable to spray sulphur mixture and rosin mixture. It is not suitable to spray sensitized zinc within 7 to 10 days; Bordeaux mixture can not be mixed with alkaline pesticides; it is not suitable to spray Bordeaux mixture 20 days before harvesting.
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