Causes and prevention methods of Bordeaux liquid phytotoxicity
2018-08-11 02:01:49
Bordeaux mixture is a widely used protective fungicide on fruit trees. The active ingredient is basic copper sulfate. Due to improper preparation and use, it should be highly valued.
First, the symptoms of phytotoxicity Bordeaux liquid phytotoxicity symptoms are divided into two categories: one is caused by copper ions, from the tip of the leaf began to darken and gradually dry, spread to the petiole direction to half of the blade, resulting in necrotic spots, and even Empty hole. The medicinal damage of the fruit has rust spots and plaques; the other type is the phytotoxicity caused by lime, which shows abnormal growth of the leaves, thickening and roughening, and hardening of the peel.
Second, the cause of phytotoxicity Some tree species and varieties are sensitive to Bordeaux mixture. Such as peach, apricot, and plum, which are sensitive to copper during the growing season, and are prone to phytotoxicity. When the amount of lime in Bordeaux mixture is lower than that of the double amount, pears, apples (especially golden crown varieties), hawthorn, and persimmon trees are prone to occur. Phytotoxicity; when the amount of lime in Bordeaux liquid is higher than the equivalent amount, grape varieties such as ä¹å¨œ, longan, and non-nuclear purple are prone to phytotoxicity.
2. When the Bordeaux mixture is prepared, the copper sulfate is not completely dissolved, and when the dregs are sprayed onto the fruit, reddish brown spots on the fruit surface may occur, and the fruit quality is lowered.
3. Mixed with stone sulfur mixture, antibacterial, etc., or spray interval is too short, it is also prone to phytotoxicity.
4. After spraying, the liquid is sprayed when it is not dry, or when the dew on the blade is not dry. The content of soluble copper on the leaf surface suddenly increases, causing leaf burns. After spraying the Bordeaux mixture for a period of time, in the case of a large wind and rain, the content of soluble copper on the leaf surface will increase rapidly, causing the leaves to burn off and cause "storm and toxic damage".
Third, the prevention of Bordeaux liquid phytotoxicity Borneo juices such as peach, apricot, and plum, which are particularly sensitive to Bordeaux mixture, cannot be used in the growing season. Other tree species should be selected according to their sensitivity to lime and copper ions. For grapes that are sensitive to lime and have strong tolerance to copper, you can use a semi-quantity ratio of quicklime; for apples that are sensitive to copper and strong to lime, you can choose lime or multi-type ratio; neither lime nor copper For sensitive pear trees, use an equivalent formula of 1 part of quicklime and 1 part of copper sulfate.
2. When preparing Bordeaux mixture, use good quality quicklime, copper sulfate should be completely dissolved to avoid precipitation. Bordeaux mixture used in the rainy season, the amount of lime should be increased when preparing.
3. When preparing Bordeaux mixture, metal containers cannot be used, and it is not possible to prepare a concentrate and then dilute with water. In addition to the copper sulphate solution and the lime liquid simultaneously flowing into a pool, the preparation process can only slowly pour the copper sulphate solution into the lime liquid while stirring, and must not be reversed. Otherwise, the formulated liquid solution precipitates quickly and easily. A phytotoxicity occurred.
4. For the non-mixable agents, such as stone sulphur, antibacterial, thiram, etc. must not be mixed; and organophosphorus pesticides should be used with mixing. The Bordeaux mixture can be sprayed 7-10 days after spraying the stone sulphur mixture. The stone sulphur mixture should be avoided within 20-30 days after spraying the Bordeaux mixture.
First, the symptoms of phytotoxicity Bordeaux liquid phytotoxicity symptoms are divided into two categories: one is caused by copper ions, from the tip of the leaf began to darken and gradually dry, spread to the petiole direction to half of the blade, resulting in necrotic spots, and even Empty hole. The medicinal damage of the fruit has rust spots and plaques; the other type is the phytotoxicity caused by lime, which shows abnormal growth of the leaves, thickening and roughening, and hardening of the peel.
Second, the cause of phytotoxicity Some tree species and varieties are sensitive to Bordeaux mixture. Such as peach, apricot, and plum, which are sensitive to copper during the growing season, and are prone to phytotoxicity. When the amount of lime in Bordeaux mixture is lower than that of the double amount, pears, apples (especially golden crown varieties), hawthorn, and persimmon trees are prone to occur. Phytotoxicity; when the amount of lime in Bordeaux liquid is higher than the equivalent amount, grape varieties such as ä¹å¨œ, longan, and non-nuclear purple are prone to phytotoxicity.
2. When the Bordeaux mixture is prepared, the copper sulfate is not completely dissolved, and when the dregs are sprayed onto the fruit, reddish brown spots on the fruit surface may occur, and the fruit quality is lowered.
3. Mixed with stone sulfur mixture, antibacterial, etc., or spray interval is too short, it is also prone to phytotoxicity.
4. After spraying, the liquid is sprayed when it is not dry, or when the dew on the blade is not dry. The content of soluble copper on the leaf surface suddenly increases, causing leaf burns. After spraying the Bordeaux mixture for a period of time, in the case of a large wind and rain, the content of soluble copper on the leaf surface will increase rapidly, causing the leaves to burn off and cause "storm and toxic damage".
Third, the prevention of Bordeaux liquid phytotoxicity Borneo juices such as peach, apricot, and plum, which are particularly sensitive to Bordeaux mixture, cannot be used in the growing season. Other tree species should be selected according to their sensitivity to lime and copper ions. For grapes that are sensitive to lime and have strong tolerance to copper, you can use a semi-quantity ratio of quicklime; for apples that are sensitive to copper and strong to lime, you can choose lime or multi-type ratio; neither lime nor copper For sensitive pear trees, use an equivalent formula of 1 part of quicklime and 1 part of copper sulfate.
2. When preparing Bordeaux mixture, use good quality quicklime, copper sulfate should be completely dissolved to avoid precipitation. Bordeaux mixture used in the rainy season, the amount of lime should be increased when preparing.
3. When preparing Bordeaux mixture, metal containers cannot be used, and it is not possible to prepare a concentrate and then dilute with water. In addition to the copper sulphate solution and the lime liquid simultaneously flowing into a pool, the preparation process can only slowly pour the copper sulphate solution into the lime liquid while stirring, and must not be reversed. Otherwise, the formulated liquid solution precipitates quickly and easily. A phytotoxicity occurred.
4. For the non-mixable agents, such as stone sulphur, antibacterial, thiram, etc. must not be mixed; and organophosphorus pesticides should be used with mixing. The Bordeaux mixture can be sprayed 7-10 days after spraying the stone sulphur mixture. The stone sulphur mixture should be avoided within 20-30 days after spraying the Bordeaux mixture.
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