First, strictly control the quality of lime and copper sulfate. When preparing the Bordeaux mixture, choose a white block, fresh and high-quality quicklime; use cyan blue, shiny copper sulfate crystals. Green or red copper sulfate contains impurities and should not be used. Because in the preparation of Bordeaux mixture, if the use of poor quality quicklime or copper sulfate, it is prone to phytotoxicity, resulting in loss.
Second, carefully master the ratio of copper sulfate and quicklime. The active ingredient of Bordeaux mixture is basic copper sulphate and is safe for plants. However, if an excessive amount of copper sulphate is used in the preparation of Bordeaux mixture, it can easily cause phytotoxicity to the plants. Therefore, the more lime in the Bordeaux mixture, the safer the plant, the stronger the adhesion of the drug, and the more lasting the efficacy. But the bactericidal effect is slowed down and the control effect is reduced Conversely, when the lime content is too low, Bordeaux's medicinal effect is accelerated and the control effect is improved, but at the same time the phytotoxicity is correspondingly increased. Therefore, when preparing Bordeaux mixture, the ratio of copper sulfate to quicklime must be appropriate. If you are not sure, do not add more lime to improve safety. Fruit trees such as apple, pear, peach and persimmon are sensitive to copper sulfate and should be used with caution. The most commonly used ratio of Bordeaux mixture on apples is: 500g of copper sulfate, 1500g of quicklime (without residue weight); the most commonly used ratio of Bordeaux liquid on pears is: 500g of copper sulfate, quicklime (including the weight of dregs ) 2500 g.
Third, pay attention to the occurrence of pear hibiscus. If the pear hibiscus is heavy and there is mucus on the leaves, spraying Bordeaux mixture at this time will make the leaves fall off. Therefore, in the case of a heavy fruit tree in pear hibiscus, it is necessary to thoroughly remove the hibiscus and mucus before spraying Bordeaux mixture.
Width:250mm*Length:1800m*Thickness:25um
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