Every year, because of the use of corn herbicides , there are always troubles such as poor efficacy or phytotoxicity. Most of them are because they do not understand the characteristics of weeds, the characteristics of the chemicals, etc., so it is necessary to understand common weeds and common herbicides in corn fields. On the basis of the symptomatic medication can get twice the result with half the effort.
It is best to use the 2,4-D butyl or isooctyl ester or atrazine for the annual broad-leaved weeds, ash, ramie, etc. Note that the dose should not be too large, and do not spray after the jointing. Nicosulfuron also has a good effect, but the grass is worse, especially the ashes. Safety Nicosulfuron should pay more attention to the appropriate dose increase. Mesotrione has a better effect on broad-leaved weeds, but it must also be used when the grass is small. Especially after entering the rainy season, mesotrione seems to have insufficient strength.
Broad-leaved weeds that are not well treated, 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 grass, 2,4-D butyl or isooctyl ester has certain effect, but the grass is slightly larger, 2,4-D It will not work, and mesotrione will not work. At this point, you can apply flufenoxyacetic acid, but pay attention to the directed spray, especially when starting long gas rooting.
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.
Xiang Fuzi claims to be the head of 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. As for the wheat seedlings, most afraid of going to Tianjin, Nicosulfuron has no problem with it.
If the field is dominated by annual weeds such as crabgrass, goosegrass, valerian, anti-branched scorpion, and scorpion scorpion, the drug is used early, the weather is not too dry, artificial knapsack spray, nicotinsulfuron is selected, and the cost is low. Thoroughly, but try to use the drug before and after 5 leaves. The early resistance of young corn seedlings is limited. More than 6 leaf corn stalks grow into the ear differentiation stage, and the risk of phytotoxicity increases. At this point, it is necessary to spray it. If there are more gray vegetables in addition to these weeds, it is enough to add a little 2,4-D to the nicosulfuron solution. The gray vegetables are most afraid of 2,4-D. If the temperature is high and the drought, the risk of chlorsulfuron is high, the safety of nicosulfuron is used, but it is necessary to increase the dose, early hit, large amount of water, otherwise the efficacy is poor. It is also possible to use mesotrione, but it is necessary to penetrate the grass. Otherwise, the grass will easily rebound.
(Source: China Agriculture News Net - Farmers Daily, Zhao Zhanzhou)
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