Nicosulfuron is a commonly used herbicide in corn fields and can effectively control a wide variety of grass weeds and some broad-leaved weeds. However, it often causes phytotoxicity due to improper use during production. When applying, it is necessary to understand the requirements of the application of the pesticide and master the use of the technology before use so as to avoid phytotoxicity. Symptoms of corn are mildly harmed by phytotoxicity. They appear to be inhibited by growth from 5 to 10 days after application. The heart leaves are chlorotic and yellow, or irregular chlorotic spots appear on the leaves. Generally, they recover after 10 to 15 days. Growth; severe injury, the leaf curled into a tube, the leaf margin shrinking, the heart was oxtailed, can not be properly extracted, remove the half of the "tail" after a few days the heart can grow. Causes of phytotoxicity (1) Maize varieties have different susceptibility to nicosulfuron. The drug is suitable for horse, horse, and hard corn. Sweet corn and popcorn are sensitive to the drug and cannot be used. In recent years, phytotoxicity has also occurred on some conventional corn varieties. After investigation, at the conventional dosage (4 grams of nicosulfuron pure drug per acre), Nongda 2008, Nongda 108, Taiyu 12, Yuyu 26, Dandan 20, and Zhengdan 18 have strong resistance and normal growth. Zhengdan 958, Qidan 18, Xindan 23, Daiyu 2nd, Taiyu 2 (reverse), Liaoyu 18, Luyuandan 14 and other varieties have good drug resistance, plant growth is slightly inhibited, and the external morphology is not Significant changes; Jindan No.7, Taiyu No.2 (orthogonal), Golden Pearls, Aster and other varieties are sensitive, showing that the growth of plants is inhibited, the leaves are yellow, and the heart leaves are oxtail-like and can not be extracted normally. Most of the Denghai corn varieties are sensitive to nicosulfuron, but the sensitivity varies among breeds. Denghai 11 and Denghai 9 were the most sensitive, Denghai 3702 and Denghai 6213 were the most sensitive, and Denghai 1 was relatively weak. (2) Improper application period. Maize 3 to 5 leaf stage has strong resistance to nicosulfuron, and it is very sensitive before and after the 2 leaf stage and 5 leaf stage, and it is prone to phytotoxicity either early or late. (3) Temperature and humidity are not suitable. After the application, the temperature below 10°C was more than 2 days, or in case of continuous high temperature and drought, the growth of corn was slow, the effect of catabolism drugs weakened, and drug hazards appeared easily. (4) Too much medication or repeated application. (5) After organophosphorus pesticides are used in corn fields, the sensitivity of the plants to nicosulfuron is increased. The interval between use is not more than 7 days, and it is easy to produce phytotoxicity. Standardized medications to prevent drug injury In the 3 to 5 leaf stage of corn, determine the amount of nicosulfuron based on soil and climatic conditions, grass conditions, etc. Select air temperature at about 20°C and air humidity above 60% for sunny days and evening application. Improve the application of technology, semi-directional spray, do not spray corn leaves. Do not re-spray, no leakage, do not arbitrarily increase the concentration and frequency of application. In addition to eliminating insect pests, it may be mixed with pyrethroid pesticides. In addition, the use of nicosulfuron with atrazine, 2 A 4 sodium chloride can reduce the amount of nicosulfuron, to avoid injury. Remedial measures The corn does not need to take special ambulance measures if it suffers minor injury. After a certain period of time, the affected plants can resume growth on their own without affecting the final yield. The following measures can be taken when the severity of drug injury is heavy. Timely watering, spraying, and appropriate amount of available fertilizer, can also spray growth regulator; strengthen cultivator, increase soil permeability, promote root absorption of fertilizer and water, and accelerate plant growth.
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