What are the common wheat field herbicides?

Common wheat field weeds in small wheat fields mainly include aphrodisiac, Japanese amaranth, alfalfa grass, head grass, hard grass, bluegrass, candle grass, wild oats, brome, and poisonous wheat. In the face of these weeds, herbicides for different weeds were born. The most common wheat field herbicides are as follows:

Isoproturon

Isoproturon can control grassy weeds and some broad-leaved weeds. At present, there are several products registered in the wheat field. Isoproturon has been used in wheat production since the 1980s and is still one of the leading varieties for weed control in wheat fields.

According to reports, the characteristics of isoproturon are mainly manifested in four aspects: The first is to kill a broad spectrum. Isoproturon has good control effect on most grassy weeds in wheat fields such as Mai Auntie, Japanese Acacia, Hardgrass, Grass, and Wild Oats, especially for malignant weeds that have rapidly increased population in recent years. Effective control effect. The second is that the application period is wide. This medicine combines the effects of soil sealing treatment and stem and leaf treatment. It can be applied from wheat sowing to wheat seedling before jointing. The third is the short residue of the drug in the soil, which is safe for the crop after the crop. Fourth, the cost of medication is moderate, and farmers are easy to accept.

The best application period of isoproturon is the peak of pre-winter weeds emergence. In spring, the weeds are older, and only as a remedial measure, the normal control of 62.5g/667m2 before winter can achieve higher control effect. , The water consumption is guaranteed at 30kg/667m2 or more.

Isoproturon has good safety for wheat, but it will reduce the antifreeze capacity of wheat seedlings. Cold flow after treatment will cause “frozen phytotoxicity”, which will cause the yellowing and growth of wheat seedlings. This kind of situation occurs almost every year.

Remind that the use of iprolong in wheat fields should avoid the first winter cold in winter. Avoid cold weather and ensure the safety of medication. After the first cold weather, wheat was subjected to low-temperature exercise and its anti-freezing ability was enhanced. The fields that had not been used in the previous period could be controlled by the “cold tail warmer”. This can ensure the weeding effect and the safety of the wheat seedlings. In addition, the interplanting of wheat in paddy fields is weak during the symbiosis with rice, and the drug resistance is poor. Therefore, the application of isoproturon should be carried out after the rice is harvested after it has been harvested. The plot must be drained and used after curing to prevent "wet damage."

Oxazolyoxime

At present, there are hundreds of fenoxaprofen products registered in the country for use in wheat fields, oxazolyl oxalate can control wild oats, see Acacia, Japan to see aunt, grass, hard grass and other grassy weeds, Poisonous weeds such as Poa spp. have strong resistance to the drug. After mastering the wheat's 2-leaf 1 cardiac stage, weeds are basically released and applied at the 2 to 3-leaf stage. When the grass age is large, the dosage should be increased appropriately. The drug has good safety to wheat and has a wide application period. Normal use of the drug in the low temperature period usually has no adverse effect on the wheat seedlings, but application of the drug at a higher temperature can improve the control effect.

Due to the fact that oxazolyoxime has been widely used in production for many years, many populations of weeds such as grass, hardgrass, and Japanese aegis, which are resistant to the drug, have increased in number, resulting in decreased control efficiency. . Grassland and weeds in different regions have different grassy and resistant performances, and the dosage should be adjusted accordingly.

Methylsulfuron

Methylsulfuron is the herbicide of wheat stems and leaves treated by Bayer CropScience in Germany. It can control some broad-leaved weeds, such as annual grasses, hardgrass, aphids, and grasses. Methylsulfuron is effective against almost all common grass weeds in wheat fields, especially against weeds that have been resistant to fenoxaprop-p-methyl, such as grass, Japanese amature, etc., in recent years. The application area in southern Jiangsu is relatively large. Grasp in the 3 to 6 leaf stage of wheat, basic weeds of grasses are basically released and applied at the early stage of 3 to 5 leaves. Generally, 30 mg/L of methylsulfuron can be used to disperse the oil suspension agent 20mL/667m2. As a result of ideal control effect, when the field grass is dominated by weeds with strong resistance, such as grass, the dosage can be appropriately increased to 25 to 30 mL/667 m2. The spraying method is applied to ensure that the water consumption is above 30kg/667m2.

It is understood that methylsulfuron has a relatively high technical requirement for pesticide application, and production must be applied strictly according to the recommended dose, period and method. In the case of waterlogging, drought, disease, alkaline soil, etc., which may cause the decline of the viability of wheat seedlings and the growth is inhibited under the adverse environment can not be used, after the drug can not significantly reduce the temperature of the weather, otherwise the wheat will appear dwarfing, chlorosis and other phenomena. It is best to apply pesticides in winter before winter, and apply the wheat during the winter and spring wheat returning seasons. After the drug is exposed to bad weather, there is a higher risk of injury. It is strictly prohibited to use wheat after jointing or up to 13cm. Post-planting corn, rice, soybeans, peanuts, cotton and other crops need to be sown after 100 days of pesticide application, and the wheat field intercropping these crops should be used with caution.

Clodinafop

Clodinafop-propargyl esters have outstanding efficacy against wild oats, aphrodisiac, hard-grass, alfalfa grass, and sticky-headed grasses, and have poor efficacy against bluegrass.

Herbicidal efficacy of clodinafop-propargyl is better than that of the herbicides such as fenoxazole, diterpenem and other herbicides, especially for weeds that have been resistant to fenoxaprofen. Good control effect. Another advantage is its good adaptability to low temperatures, which will not adversely affect the wheat seedlings in the low temperature environment (except for individual spring wheat varieties). Although the speed of the grass will slow down, it will not affect the final control effect.

Studies have shown that some gramineous weeds have increased resistance to clodinafop-propargyl esters in some areas in recent years, but overall, gramineous weeds in most areas are still sensitive to the drug. Production should be based on the type of weeds and grass size to determine the amount of medication, usually before winter wheat pole 15% clodinafop-based WP 30g/667m2, spring grass when the amount of increased to 40g/667m2. In areas with more resistant weeds, the drug dosage can be appropriately increased, but the amount should not exceed 60g/667m2, otherwise it will have adverse effects on the growth of wheat seedlings.

Oxazoline

Hortoporphyrins are suitable for the treatment of stems and leaves of wheat fields to control a variety of grass weeds such as amaranth, hard-grass, alfalfa, and wild oats, and are not sensitive to early maturation, bromegrass and amygdalin. Zozolopyrin has a new site of action, and there is no cross-resistance to other drugs such as oxazolyoxime and herbicides.

The application period of the oxazoline herbicide is wide, and it can be applied from the 2 leaf 1 heart stage to the booting stage of the wheat seedlings. Considering the comprehensive application cost and the herbicidal effect, it is most suitable for the grassy weeds at the 3 to 5 leaf stage. Afterwards, as much as possible, avoid the occurrence of large-scale cooling and cold weather. Aixiu 50g/L oxazoline EC is used in wheat fields and wheat fields. The recommended dosage is 80mL/667m2 before winter and 80-100 mL/667m2 in spring.

Niflusulfuron

Xifazosulfuron is mainly used in wheat fields to control grassy weeds and some broad-leaved weeds such as leeks, wild peas, and blue vegetables. The medicine has good control effect against malignant grass weeds, and can effectively prevent grassy weeds that are difficult to control with common wheat crops, such as precocious buckwheat, ryegrass, brome, and wild oats.

The clozastrodone sulfonylurea herbicides and the aryloxyphenoxypropionate herbicides such as oxazolyoxime have different sites of action, so there is no cross-resistance and they can be controlled. Herbicides produce resistant grass weeds. The combination of flufenoxuron and clodinafop-propargyl has a synergistic effect, in particular, it can improve the control effect of Apis mellifera and Apocynum quinquefolium in Japan. At present, it is mostly mixed with clodinafop-propargyl. Xetrasulfuron has good safety to wheat, and it can be applied from the 2 leaf 1 heart stage to the jointing stage of wheat, and has low requirements on the environment. It is currently a herbicide that can be used to control early weeds and other vicious weeds in wheat fields. The relatively high safety of the species.

Xifazosulfuron has both soil sealing and stem and leaf treatment effects and is best used before winter. Most of the weeds in the field have germinated and used in the 2 to 4 leaf stage. When the grass age is above the 5 leaf stage, the dosage should be increased. Normally, 75% furazolidone water dispersible granules are used in Suining 3～4.5g/667m2, with 15% clodinafop-propionic ester microemulsion 30mL/667m2, when the grass age is relatively large, or when the field is dominated by early-mature pods and other weeds, Use the upper limit of the recommended dose. The efficacy of Xylazosulfuron on hardgrass remains to be tested, and it is not recommended for hardy grass-based plots. The drug's adaptability to low-temperature frost is good, but it is best to apply it when the maximum daily temperature is higher than 8°C, and the field cannot accumulate water for a long time. About 60 days after application, most of the drugs in the soil are degraded, which is good for the safety of post-planting crops.

Sulfisomidine

Sulfochlor is a herbicide for stems and leaves in barley fields and can control a variety of grasses and broad-leaved weeds. Currently, domestically registered preparations are the preferred 7.5% furfural water dispersible granules.

Sulfosugamide has a very broad spectrum of grasses, including common aphids, acorns, wild oats, bromegrass, ryegrass, hardgrass and other grassy weeds and barnacles, wild geraniums, Broad-leaved weeds such as leeks, sowed wormwood, and common quail have good control effects, and they have poor control effects on bluegrass, grass, and swine fever. Good control of Japanese acacia, ryegrass, wild oats, hard grasses and other malignant grass weeds is the outstanding advantage of furocyanime, and the drug and oxazolyl oxime, clodinafop propargyl, etc. The drug has no cross-resistance and can effectively control the aphids that have already developed resistance to these herbicides, and look at Acacia in Japan. In the past two years, the area where these weeds occur is heavy and the area of ​​application is large.

Trimethoprim is better compounded, and can be controlled with Maixi 58g/L biflorizine suspension, fluoxyl, tribenuron, bensulfuron-methyl, bromoxynil, 2A 4 chlorine, etc. Herbicides with broad-leaved weeds are used in combination to expand the weed kill spectrum of broad-leaved weeds, but they cannot be used in combination with valtopazone preparations. The average half-life of the drug in the soil is 13d, and the residue period is short, which will not cause adverse effects on the crops.

Sulfoxanthol has high activity, and should be applied strictly according to the recommended dose, application period and method when applying pesticides, otherwise it may cause phytotoxicity. The preferred 7.5% furocaine water dispersible granules can be applied before winter and spring, generally 12.5g/667m2. The spring grass age can be increased when the grass age is large, but not excessive, so as to avoid adverse effects on wheat. The sooner the medication is used after the grass weeds are released, the better the wheat can not be used after it has been jointed. After the application of some wheat varieties will appear yellowing phenomenon, but will not cause dead seedlings, can resume growth later, have no effect on the yield. There should be no large cold weather within 2 days after spraying. When the minimum temperature is lower than 0°C, the medication should be stopped so as not to cause phytotoxicity to wheat.

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