The injury can be generally divided into acute injury and chronic injury. Symptoms Acute injury occurs quickly and symptoms are evident. In general, there are spots or wilting on the leaves; the fruit is spotted, deformed or not strong; the petals are scorched, fallen, and budded; the growth of the plants is delayed, and even the whole plant dies. The symptoms of chronic injury are not obvious and it is not easy to judge in a short time. The general performance is slow photosynthesis, poor development, delayed flowering, small and small flowers, lighter flowers, flowers and fruit easily fall, very similar to the symptoms of nutritional deficiencies. Prevention of strict control of the use of pesticide concentrations and doses, if found that the use of standard doses and concentrations of pesticides can not achieve the desired results, should replace the pesticide species. Do not mix pesticides at random so as not to cause injury. First aid If you use the wrong medicine, spray a lot of water immediately to wash the plants. If the wrong soil treatment agent is used, the irrigation and drainage can be used alternately to rescue the soil, and then the quick-acting fertilizer can be applied after washing to promote the recovery of the damaged plants. If the medication error occurs and the discovery is more timely, it can be neutralized by the opposite sex under the guidance of a pharmacological scientist. For example, after a phytotoxicity is caused by using a dimethoate emulsion, it may be neutralized with alkaline pesticides such as lime sulfur, methomyl, or sprayed with 200-fold borax solution one or two times. When the broad-leaved flowering plant misuses dimethyl tetrachloromethane herbicide, the leaves suffer from whitening, and 50% of the humic acid sodium granules can be dissolved in a little water first, and then 500 times the water, and the plants are dripping, 3 After 5 days, the leaves can resume their function. If spraying copper sulphate produces phytotoxicity, it can spray 1%-5% lime to hydrolyze the poison.
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