Bordeaux mixture is a bactericidal plant protection agent widely used in fruit trees. It can promote the green color of leaves and grow vigorously, improve the disease resistance of trees, and is especially effective for fruit tree downy mildew and anthracnose. However, due to its alkaline reaction, the concentration and dosage of the fruit trees are different. The blind use is easy to cause phytotoxicity. So what problems do you need to pay attention to when using Bordeaux juice in fruit trees? What problems should be paid attention to when using Bordeaux liquid in fruit trees? 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 fruit trees are sensitive to copper. It is suitable to use 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 plants in the early stage 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; pears and grapes generally use copper sulfate in the dry season: quicklime: Bordeaux mixture with water: 1:0.5:150-200, and 1:1:150-200 times Bordeaux mixture in the rainy season. 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 stone sulphur 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 fruit harvesting. What are the problems that need to be paid attention to when using Bordeaux liquid in different fruit trees? Apple: Bordeaux mixture is mainly used to control early defoliation and anthrax in apples. Apple trees are more sensitive to copper and should use multi-volume or equivalent Bordeaux mixture. The epidermal cells of the varieties such as ruby ​​and golden crown are susceptible to the stimulation of Bordeaux mixture to produce fruit rust. These varieties are not easy to use Bordeaux mixture. Pear: Bordeaux mixture is mainly used to control pear scab and rust. Pears are more sensitive to copper sulfate, and a large amount of Bordeaux mixture should be used. Grape: Mainly used to control grape black pox, downy mildew, brown spot. Grapes are sensitive to lime and should be used in semi-volume or equivalent Bordeaux mixture. Peach, apricot, plum, etc.: These fruit trees are particularly sensitive to copper sulfate, and Bordeaux fluid cannot be used during the growing season. In addition, Bordeaux liquid should not be used on rainy days, when the air is humid, or when there are dew on the surface of the leaves, to prevent the soluble copper caused by chemical reactions from harming the fruit trees. More pesticide knowledge , please pay attention to China Pesticide Network Led Round Downlight,Recessed Round Downlight Led,Led Recessed Round Lighting,Recessed Led Round Downlight Foshan Extrlux Co., Ltd. , https://www.extrlux.com