In recent years, some new herbicides include fenoxaconazole, amicarbazone, clopisulfuron-methyl, isocarbamoxan and thiasulfuron-methyl. Among them, chlorhexosulfuron has a more than 90% control effect on the aconite, and it is safe for corn and post-cropping wheat, garlic, onion, and spinach. It is the only excellent pre-emergence and post-emergence herbicide that can completely eradicate Aconite from corn fields. Its main characteristics are low dosage, high efficacy, and special effects on broadleaf weeds and Cyperaceae weeds. Isofazoxazone + Thilosulfuron-methyl before or after seedling in early postemergence period (before the 3-leaf stage), using 7.9-9.5g of active ingredient per acre, spraying evenly with water, on goosegrass, The control effect of crabgrass, Setaria virescens, Valeriana officinalis, Rhizoma lyratum, Amaranthus retroflexus, Portulaca oleracea, Castor, Xanthium hirsutum, Poria cocos, etc. is about 95%, and that of iron amaranth is about 80%. The test dose range is safe for corn and sorghum wheat, barley, soybeans, potatoes, rapeseed, spinach, garlic, etc. Judging from the registration situation, there are fewer new varieties, and the proportion of old and new varieties of production is relatively large. Traditional herbicides have a large variety, such as nicosulfuron, acetochlor and atrazine. Acetochlor has a good weeding effect and low cost, but it has poor safety for corn; the atrazine has a long residual period and affects the safety of the crop after harvest. There are fewer new types of environmental agents and traditional dosage forms still dominate. Dispersible oil suspensions, emulsifiable concentrates, and suspensions account for more than half of the herbicide herbicide dosage forms in corn fields. Newer formulations with higher technical requirements such as suspoemulsions and microcapsule suspensions account for only a small proportion. Dangerous accidents occur from time to time, and herbicides should always be used for safe drug use. The optimum application time of the postemergence stem-leaf treatment agent is 4-6 leaf stage of corn. After application of excessive or 6-leaf period, it is easy to cause phytotoxicity, resulting in distortion of the leaves and brittleness of the stems. For example, nicosulfuron is generally safer in the corn 3-5 leaf stage, with less than 2 leaves or more than 6 leaves, and it is easy to produce phytotoxicity. Selective endotrapping herbicide Atrazine, which is used as a selective herbicide, can cause the leaves of the corn to turn green and yellow, and the growth is blocked and gradually wither.
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