Hubi, Lingbi County, Anhui Province, said on July 5th that he used 21.5% nicotinamide (including nicosulfuron 14% and atrazine 17.5%) per acre when there were 3 leaves visible in normal corn. 100 ml, add 15 kg of water spray, when the drug is not strong seedlings. Maize seedlings are now in the 3-4 leaf stage. The heart leaves are chlorogenic and distorted. The other leaves are yellow and the field disease rate is 60%-70%. He asked if the corn had been harmed by herbicides. Nicosazine is a compounding agent for nicosulfuron and atrazine. It is suitable for control of gramineous weeds and broad-leaved weeds in corn fields. This medicine is used in corn fields and is required to be used at the 3-5 leaf stage of corn. It is easy to produce phytotoxicity when it is used before or after the 3rd leaf stage of corn. Excessive drug use or repeated drug use, organic phosphorus pesticides within 7 days before and after application are prone to phytotoxicity. Corn is harmed by nicosulfuron, which manifests itself as chlorosis, yellowing, or irregular chlorotic spots on the leaves 5-10 days after application. Some leaves are curled into a tube and the leaf margins are shrunken. Oxtail shape, can not be normal. The growth of the damaged maize seedlings is inhibited, the plants are dwarfed and there may be partial clusters and secondary stems. Light injury can restore normal growth and seriously affect yield. The corn acquired the Atazin phytotoxicity, which showed that the leaves were yellowing. Generally, after 10-15 days, the leaf color could turn green and resume normal growth. The above plots of corn showed chlorotic yellowing and distortion of the heart, yellowing of other leaves and other symptoms, and may have received the phytotoxicity of nicotine torazine. According to reports, there are only 3 visible leaves of corn when it is used. At this time, corn is generally in the 2-leaf stage, and the time of application is too early to cause injury. In addition, 15 kilograms of water per acre of water spray, less water, liquid concentration, it is also easy to cause damage to corn. The above-mentioned damaged corn seedlings can be sprayed with alizarinide or gibberellic acid plus urea (preferably in the morning after the dew or in the evening, spraying the front and back of the leaves), so as to promote the recovery of the plants and reduce the injury. After the gradual mitigation of drug damage, combined with watering and increasing the use of human and animal manure, ammonium bicarbonate, ammonium nitrate, urea and other available fertilizers, spraying 1%-2% urea solution and 0.2%-0.3% potassium dihydrogen phosphate solution, there are It is conducive to the recovery of corn and reduce damage caused by pesticides.