Nicosulfuron is a commonly used herbicide for postemergence shoots and leaves in corn fields. In recent years, the drug has been used in some areas to produce heavier phytotoxicity. Symptoms are the chlorosis of yellow maize leaves, or the appearance of irregular chlorotic spots on the leaves; some of the leaves curl up into a tube, the leaf margins shrink, the heart leaves are oxtailed and cannot be extracted normally; the plants are dwarfed, sometimes Produces tufted, secondary stems.
According to analysis, there are several reasons for the emergence of nicosulfuron in corn.
(1) The amount of medication is too large.
(2) Improper use of medication. The use of nicosulfuron before the 2-leaf stage or after the 6-leaf stage of the corn may cause phytotoxicity.
(3) Improper application methods. After the 5th leaf stage of corn application, it is not directional spray, even mixed with pesticides, and a large amount of liquid is applied to the corn leaf to cause phytotoxicity. In addition, corn that has been used with organophosphorus pesticides is sensitive to nicosulfuron, resulting in phytotoxicity if the interval is less than 7 days.
(4) uneven spray.
(5) After the drug, it is vulnerable to cold weather and rainy weather.
(6) Sweet corn and popcorn, sensitive to nicosulfuron.
To prevent nicosulfuron phytotoxicity, it is first necessary to determine the dosage according to the soil, meteorological conditions, and grass conditions, and evenly spray, not re-spray, and no leakage. Second, we must strictly control the appropriate period of medication. Maize 3 to 5 leaf stage had the strongest resistance to nicosulfuron, and the drug was safest at this time. The corn should be sprayed after the 6th leaf stage to avoid contact with the corn leaf. It is not appropriate to use corn before the 2 leaf stage and after the 10 leaf stage. Again to raise the level of application. Use a sprayer with good performance, such as the WS-16P manual sprayer manufactured by Shandong Weishi Zhibao Machinery Co., Ltd. and the Taishan-18AC knapsack power sprayer manufactured by Shandong Huasheng Agricultural Pharmaceutical Co., Ltd.
When the corn is mildly poisoned by nicosulfuron, the growth is temporarily inhibited and no treatment is required. After a period of time, the corn can be recovered without affecting the yield. If the injury is heavy, take some measures;
(1) A sufficient amount of water is poured to make the maize root system absorb a large amount of water to reduce the herbicide concentration in the plant. Combine watering to increase fertilizers such as manure, ammonium uric acid, ammonium nitrate, or urea to promote root growth. It is also possible to spray 1%~2% urea solution or 0.2%~0.3% potassium dihydrogen phosphate solution or Huimanfeng 600~800 times solution.
(2) Spraying of streptozotocin, gibberellin, antidote, etc., can promote the early recovery of damaged plants.
(3) Appropriately increase the depth and frequency of depression and enhance soil aeration.
(4) Prevent and treat pests in time to improve the resilience of maize. If the above measures still do not alleviate the symptoms of drug damage, they should be destroyed or replanted as soon as possible.
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