The phytotoxicity of pesticides on plants is divided into acute and chronic. Acute phytotoxicity is manifested within a few hours to several days of spraying, such as spots, yellowing, chlorosis, withering, rolling leaves, deciduous fruit, and constricted clusters in leaves or fruits. Chronic phytotoxicity can only be manifested after a long period of time, such as weak photosynthesis, delayed flower bud formation and fruit ripening, dwarf deformity, and deterioration of flavor and color. Once the fruit tree is found to be phytotoxic, the following measures should be taken immediately to save:
Spraying potassium permanganate Potassium permanganate is a strong oxidant that has oxidative decomposition effects on a variety of chemicals. Spraying 6000 times potassium permanganate solution can effectively alleviate the phytotoxicity.
Rinse with water Most chemicals are not water-resistant. If the concentration is too high, the spray may be filled with water to spray the leaves of the fruit trees repeatedly to wash away the pesticide remaining on the surface of the leaves.
Suspension of similar drugs Before the phytotoxicity has not been completely relieved, the use of pesticides should be minimized, especially for similar pesticides, so as not to aggravate the phytotoxicity.
Follow the fertilization After the phytotoxicity of the fruit trees, some quick-acting fertilizers should be added in combination with watering, and the cultivating loose soil should be carried out to promote the normal growth and development of the fruit trees as soon as possible. At the same time, foliar application of 0.3% to 0.5% urea, 0.2% to 0.3% potassium dihydrogen phosphate, etc., can improve the nutritional status of fruit trees and enhance the absorption capacity of roots. When operating, care should be taken to spray the back of the leaf, usually before 10 am and after 4 pm.
Spraying potassium permanganate Potassium permanganate is a strong oxidant that has oxidative decomposition effects on a variety of chemicals. Spraying 6000 times potassium permanganate solution can effectively alleviate the phytotoxicity.
Rinse with water Most chemicals are not water-resistant. If the concentration is too high, the spray may be filled with water to spray the leaves of the fruit trees repeatedly to wash away the pesticide remaining on the surface of the leaves.
Suspension of similar drugs Before the phytotoxicity has not been completely relieved, the use of pesticides should be minimized, especially for similar pesticides, so as not to aggravate the phytotoxicity.
Follow the fertilization After the phytotoxicity of the fruit trees, some quick-acting fertilizers should be added in combination with watering, and the cultivating loose soil should be carried out to promote the normal growth and development of the fruit trees as soon as possible. At the same time, foliar application of 0.3% to 0.5% urea, 0.2% to 0.3% potassium dihydrogen phosphate, etc., can improve the nutritional status of fruit trees and enhance the absorption capacity of roots. When operating, care should be taken to spray the back of the leaf, usually before 10 am and after 4 pm.
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