Every year, because of the use of corn herbicides , there are always problems of poor efficacy or phytotoxicity. Most of the reasons are not related to the characteristics of weeds, the characteristics of the chemicals, etc., so it is necessary to understand the common weeds in corn fields and On the basis of common herbicides, symptomatic medication can get twice the result with half the effort.

It is best to control the annual broad-leaved weeds, ash, ramie, ramie, etc., with 2,4-butyl butyrate or 2,4-diisooctyl ester or atrazine. Note that the dose should not be too large and should not be applied after corn jointing. Nicosulfuron also has a good effect, but the effect of controlling large grass is poor, especially ash. Safety Nicosulfuron should pay more attention to the appropriate dose increase. Mesotrione has a better effect on broadleaf weeds, but it also needs to be used when the grass is small. Especially after entering the rainy season, the mesotrione is more than enough.

Broad-leaved weeds that are not well controlled, such as purslane, have strong vitality. When the field is a lot of purslane, it is added to the liquid of nicosulfuron. A little bit of chlorfenapyr, directional spray will have a good effect. Perennial broadleaf weeds such as thorn, morning glory, and valerian, if used in small grasses, 2,4-butyl butyl or 2,4-diisooctyl ester has a certain effect, but the grass is slightly larger. 2,4-Drip effect is not very good, and mesotrione is not effective for big grass. At this point, flupiroxyacetic acid can be used, but care should be taken to spray as much as possible, especially when corn begins to grow in the air.

It is not feasible to use mesotrione alone for grasses such as crabgrass, goosegrass, and valerian, and it needs to be compounded with atrazine. Even so, be careful with the foxtail, which is the least effective against it.

Xiangfuzi claims to be the most difficult malignant weed in the world. Don't worry too much in the corn field. Nicosulfuron is its nemesis. But try to spray when the grass is small, and be careful not to hurt the corn seedlings. The most effective way to control wheat seedlings is atrazine, and nicosulfuron is also good.

If the field is dominated by annual weeds such as crabgrass, goosegrass, valerian, anti-twig, and scorpion scorpion, you can choose nicosulfuron in the case of early medication, less dry weather, and artificial knapsack spray. The cost of the drug is low and the weeding is thorough, but it should be used before and after the corn 5 leaves. The resistance of the early-earning maize seedlings is limited. The growth point of the stems of more than 6 leaves of corn leaves enters the ear differentiation stage, and the risk of phytotoxicity increases. If there are many gray vegetables in addition to these weeds in the field, you can add 2,4-D drops to the nicosulfuron solution. If the temperature is high and the drought, the risk of phytosulfuron is high, and the safety of nicosulfuron can be used. However, it is necessary to increase the dosage, early hitting and large water volume, otherwise the effect is poor; you can also use mesotrione to add Tsu, but must be thoroughly penetrated, otherwise, the grass is easy to rebound.

More pesticide knowledge , please pay attention to China Pesticide Network

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