The reasons for the damage caused by the vegetables in the first place are the misuse of pesticides that are not suitable or the misuse of herbicides. The second is the application of excessive pesticide concentrations or continuous repeated application of pesticides. The third is the application of pesticides under high temperature or high humidity conditions. The application of inferior pesticides, the fifth is the soil application is not uniform enough. Phytotoxicity symptoms Speckle spots mainly occur on the leaves, and sometimes also on the stem or fruit epidermis. Commonly there are brown spots, yellow spots, and net spots. Yellowing yellowing occurs mainly in the stems and leaves of vegetables, mostly in leaves. The main cause of yellowing is the destruction of chlorophyll in the leaves by the pesticides, yellowing of the light leaves, and yellowing of the whole plants. Malformations caused by phytotoxicity can occur in the stems, leaves, fruits and roots of vegetables. Commonly there are leaf curling, tufting, rooting, and fruit malformations. Withered wilting caused by phytotoxicity is often the whole plant has symptoms, generally caused by improper herbicide application. There is no episode of wilting caused by phytotoxicity, and the development process is relatively slow. After the first yellowing, the seedlings are killed and the transduced tissue is not browned. Growth stagnation The symptoms of slow growth caused by phytotoxicity are often associated with spots or other signs of phytotoxicity compared with those caused by physiological diseases. Poisoning is often characterized by poor root growth. Symptoms are expressed as yellow or dark green leaves. Remedy If the water spray is used to wash the leaves and plants to cause injury due to spraying the liquid, the leaves may be quickly sprayed with a large amount of clean water when the early liquid is not yet completely penetrated or absorbed, and washed repeatedly 3 to 4 times to try to put the liquid on the surface of the plant. Scour away, and cooperate with cultivator loose soil to promote root development, so that the plant quickly returned to normal growth. After catching the quick-acting fertilizer to produce phytotoxicity, it is necessary to water it in time and top up the quick-acting fertilizer such as urea. In addition, foliar spray of 1% to 2% urea or 0.3% potassium dihydrogen phosphate solution is also required to promote plant growth and increase their ability to resist phytotoxicity. Antidote or plant growth regulators are used to neutralise the drug against the nature of the pesticide causing the injury. For example, after applying excessive amount of copper sulfate, 0.5% of quicklime water can be sprayed. After spraying paclobutrazol, the amount of gibberellin can be relieved after being sprayed, and foliar spraying can also be used. Irrigation and Washing Fields For fields with excessive soil application, irrigation should be carried out as soon as possible so that a large amount of drugs can be expelled out of the field with water, so as to reduce phytotoxicity. Remove the victim at the time to remove the fruits, branches and leaves of the vegetables, and prevent the agent in the body from continuing to conduct and infiltrate.
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