There are two kinds of acute and chronic pesticide damage to plants. Acute injury is manifested within a few hours to several days after spraying. For example, the leaves (fruits) are spotted, yellowed, chlorotic, withered, leafy, deciduous, fruiting, and tufted. Chronic drug damage manifests itself after a long period of time, such as weakened photosynthesis, delayed flower bud formation and fruit ripening, dwarfed deformity, and deteriorated flavor and color. Once fruit trees are found to have been sterilized, the following measures should be taken immediately to rescue them. 1, spraying potassium permanganate It is a strong oxidant, has a oxidative decomposition of a variety of chemicals. Spray 6000 times potassium permanganate solution, can effectively alleviate the injury. 2, rinse with water and most chemicals are not resistant to water erosion, if the application of excessive concentration caused by phytotoxicity, use a sprayer filled with water, spray repeatedly wash toward the leaves of fruit trees, to wash away the residual agent on the surface of the leaves. 3. Suspension of similar drugs Before the phytotoxicity has not been completely eliminated, reduce the use of pesticides as much as possible, especially the use of similar pesticides to stop use, so as not to aggravate the injury. 4. Immediately following the occurrence of phytotoxicity in fertilized fruit trees, some quick-acting fertilizers should be added in combination with watering, and then cultivating loose soil can promote the normal growth and development of fruit trees as soon as possible. At the same time, 0.3%-0.5% urea and 0.2%-0.3% potassium dihydrogen phosphate were sprayed on the leaves to improve the nutritional status of fruit trees and enhance the root absorption capacity. During operation, care should be taken to spray the back of the leaf evenly. The optimum temperature is between 18 degrees Celsius and 25 degrees Celsius, before 10 am and after 4 pm.
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