The harm caused by the direct cause of a drug is called the drug harm. Commonly used in production are stone sulfur mixture, sulfur powder, sodium pentachlorophenol, ammonium and copper sulfate. In addition, there are some pesticides used in fruit trees, which have certain specific requirements, and some have specific sensitivities to different fruit trees. For example, trichlorfon and dichlorvos are particularly sensitive to kiwi and stone fruits and cannot be used; malathion is particularly sensitive to peach trees and should be used at low concentrations; mite and gram mite are sensitive to pear trees and cannot be used; It is sensitive to certain varieties of peach and grape, and should be used with caution; stone sulfur mixture is prone to drug damage to young tissues of fruit trees such as peach, plum, grape, and pear, and should be used with caution; 2,4-D butyl ester, dimethyl tetramethoxide Chlorine is very sensitive to all fruit trees. Do not use it. Precisely speaking, the prevention and control of fruit tree diseases and insect pests by a pesticide is not broad-spectrum, and there are differences between special effects, effective and ineffective. It must be targeted when selecting, but there are often fruit farmers in production. The phenomenon of use beyond the scope, which is very easy to produce common drug damage. Physiological phytotoxicity The growth of fruit trees has different physiological stages, and is affected by external influences, and has different degrees of response. This reaction is formed by drug factors. This phytotoxicity is physiological phytotoxicity. The period of occurrence of phytotoxicity is mainly in the new growth period of fruit trees, the stage of young fruit cell division and the rapid expansion of fruit. During these growth stages, the reactions to pesticides are relatively fragile, and they are easily affected by drugs. For example, bacteriochlor, acetonitrile, tebuconazole, propiconazole, etc., used in the new shoot period, will cause the fruit tree to become cork and cause fruit rust because the waxy layer has not been formed yet, and it is easy to be stimulated by the agent. Meteorological hazards The medicinal hazards caused by fruit trees during spraying and before and after spraying due to high temperature, high humidity, and rainfall are meteorological hazards. In the production of fruit trees, the proportion of such phytotoxicity is relatively high, especially in the high-temperature stage in summer and autumn. A slight negligence may cause a large area of ​​phytotoxicity. Fruit tree treatment After stopping the application of similar pesticides in orchards, when determining which pesticides cause harm, minimize the use of pesticides before the pesticides are completely eliminated, especially not to re-use the pesticide varieties and formulations that have clearly caused the harm. To prevent aggravating losses. Rinse immediately with clean water. If the application concentration is too large and cause harm, fill the water with a sprayer and repeatedly wash the leaves of the fruit tree to wash away the remaining medicine on the surface of the leaves. The earlier and more timely this measure, the better. After a proper amount of fruit trees have been harmed by medicine, they should be trimmed promptly and appropriately to remove dead branches and remove dead leaves to prevent the spread of dead parts or infection caused by pathogens. When the spray is used to neutralize the leaves, such as phytotoxicity, the leaves can be sprayed with 3,000 times of 50% sodium humate for foliar spraying or 5,000 times of 50% sodium humate for irrigation in the same way. After 3-5 days, the leaves will gradually turn green; if it is caused by the stone sulfur mixture, it is sprayed with 400-500 times rice vinegar solution on the basis of water washing, which can reduce the drug damage; For phytotoxicity, spray 0.5% -1% lime aqueous solution to eliminate phytotoxicity. If misuse or excessive use of pesticides such as organophosphorus, pyrethroids, aminomethyl esters and other pesticides cause phytotoxicity, spray 0.5% -1% lime Water, detergent powder, soapy water, washing clean water, etc., especially spraying ammonium bicarbonate alkali fertilizer solution is better. It not only has the effect of detoxification, but also can promote the growth and development of extra-root fertilizer. The plant cell activator used for topdressing in time. Sodium nitrophenolate 2000 times and 0.3% urea foliar spray, the effect is more significant. Plant growth endogenous hormone Brassinolide has the effect of increasing the vegetative growth of plants, and also has the effect of improving the phytotoxicity of fruit trees. Increasing the application of quick-acting fertilizers can improve the stress resistance of the tree and can alleviate the degree of pesticide damage. No matter what kind of phytotoxicity, foliar application of 0.3% urea solution and 0.2% potassium dihydrogen phosphate mixed solution, spray once every 15-17 days, and even spray 2-3 times, can reduce the phytotoxicity. Best Reusable Ffp2 Mask Uk,Reusable Ffp2 Mask Uk,Ffp2 Mask Vs N95,Ffp2 Mask Vs Kn95 Zhejiang Lanhine Medical Products Ltd. , https://www.lanhinemask.com
Fruit tree drug damage can be remedied like this
Harmful type