Baochun County, Zhichungang Town, Sunchun, November 6, said in a telephone call that there were a lot of grass damages during the wheat growing season last year, and that all the medicines such as fenazolone, clodinafop, and oxazolinergide could not be eliminated. . A 9-acre wheat field has just been planted this year. After planting, 187.5 grams of 50% isoprenone wettable powder per acre is used for soil closure. He asked whether it was possible to control the herb once more 15 days after the application of isoproturon.
In the middle and late 1980s, grasses began to invade wheat fields in our province. Currently, they are mainly distributed in rice, wheat, and wheat fields in neutral to slightly acidic clays and clay loams. In some areas, they gradually replaced Aegice as weeds in wheat fields. The essence of frazoxime is used to control the grass, and it needs to be controlled when the grass age is small (3-4 leaf stage). When the grass age is large, the application of the pesticide is poor. Due to the continuous use for many years of production, the anti-tolerance of the grass weeds such as wheatgrass and weeds in some places in southern Jiangsu and Anhui Tianchang has been significantly enhanced. Different grass ages have different resistance to ferfazidron. The resistance is lower before the 3rd leaf and 1st heart stage, and the resistance is significantly enhanced at the 4th leaf stage and later after delivery, exceeding the 7 leaf stage. Even if the amount of application of fine frazoxime is difficult to control.
Clodinafop-propargyl is suitable for control of wild oats in wheat fields, aunts, hard grasses, grasses, and head grasses. It has good control effect on grasses. However, judging from the large-scale application of production in recent years, the drug has also shown poor control of the grass when it is applied in some fields such as Yixing, Changshu, Jinhu, Hongze and Tianchang. The drug should be applied when the grass is young. When the grass age is large, the dosage should be increased.
The oxazoline clodinafop-propargyl is a mixture of oxazoline oxalate and clodinafop-propargyl, which is used to control grassy weeds in wheat fields. It has a good effect on aphrodisiacs and grasses that have developed drug resistance. The head grass and other vicious weeds also have better control effects. The drug can be used from the wheat 2 leaf 1 heart to the end of jointing, and is safe for wheat. The use of this medicine to control wheat fields and grasses should also be taken care of when the grass age is small and the efficacy will be reduced when the grass ages.
According to Sun Chun, the use of fenzotriazcaprate, clodinafop-propargyl, and oxazoline clodinafop-propargyl in the growing period of wheat is not effective in controlling grasses. In addition to herbicide resistance, it may also be associated with application time. Late, incorrect application methods and other factors.
Isoproturon has a certain control effect on grass. Before the seedlings of wheat were sown, they were used for soil sealing treatment before seedlings, and they had a good blocking effect on freshly sprouted grasses. In the wheat seedling stage (1-2 leaf stages), they were treated with isoproturon for stems and leaves, and were in seedlings. Grass also has a good kill effect. More than 3 leaves of the grass with ipratropium control effect is not good, an appropriate increase in the amount of medication can improve the control effect. The above blocks were treated with isoproturon for soil sealing before seedlings of wheat. Normally, they will have good control effect on weeds such as grasses. Afterwards, they can be applied according to the situation. If weeds are still present in the field, weeds occur. , we can consider the basic out of the weeds, grass age in the four-leaf period before the use of clodinafop-propargyl, oxazoline clodinafop-propanol and other drugs to prevent.
Methylsulfuron has good control effect on weeds, such as grass and bluegrass, but it should be used safely.
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