What are the common wheatgrass herbicides in the wheat field? Pesticides Xiao Bian most qualified to comment on common wheat Grassy herbicide, pesticide run China Network sites over the years, many people consult small series, playing weeds herbicides What? If you want to know the wheatgrass weed herbicides, what are the common weeds in the wheat field?
Common grass weeds in wheat fields mainly include Mai Niang, Japanese maiden, yarrow, stalk, hard grass, bluegrass, candle grass, wild oats, brome, and toxic wheat. In the face of these weeds, herbicides for different weeds were born. The pesticide nets compiled the most common wheatgrass herbicides as follows:
1 Isoproturon can prevent grass weeds and some broad-leaved weeds. At present, there are many products registered in wheat fields. Isoproturon has been used in wheat production since the 1980s and is still one of the leading varieties of weeding in wheat fields.
According to reports, the characteristics of isoproturon are mainly manifested in four aspects: First, the spectrum of killing grass is wide. Isoproturon has good control effect on most grass weeds in wheat fields such as Mai Niang, Japanese maiden, hard grass, alfalfa and wild oats, especially the malignant weeds that have increased in population in recent years. Outstanding effect. Second, the application period is wide. The drug has both soil blocking treatment and stem and leaf treatment effects, and can be applied from wheat sowing to wheat seedling jointing. The third is that the drug has a short residual period in the soil and is safe for the later crops. Fourth, the cost of medication is moderate, and farmers are easy to accept.
The optimal application period of isoproturon is the peak period of weed emergence before winter, and the weeds are too large when used in spring. It is only used as a remedy. Generally, the high-efficiency effect can be achieved with pure medicine 62.5g/667m2 before winter. The water consumption is guaranteed to be above 30kg/667m2.
Isoproturon has good safety to wheat, but it will reduce the anti-freezing ability of wheat seedlings. After the drug is cold, it will easily produce "frozen phytotoxicity", which will cause yellowing and growth inhibition of wheat seedlings. This kind of situation occurs every year in Jiangsu Province. Qian Yongkang reminded that the use of isoproturon in wheat fields should avoid the first cold spell in winter. According to meteorological data, the first cold outflow in Jiangsu Province is now in late November. The wheat field is used before the first half of November. It can usually avoid the cold weather and ensure the safety of medication. After the first cold current, the wheat has undergone low temperature exercise, and the antifreeze ability is enhanced. The field that has not been used in the early stage can be controlled by the “cold tail warm headâ€, which can ensure the herbicidal effect and the safety of the wheat seedling. In addition, the wheat in the paddy field is weak during the symbiotic period with rice, and the drug resistance is poor. It is necessary to apply isoproturon after the rice is harvested after the rice is harvested. The paddy field must be drained after refining to prevent "wet phytotoxicity".
2 Razodazole and grasses At present, there are hundreds of oxazol-grass products registered in wheat fields. The representative products include the German Bayer Crop Science Company's Hummer 69g/L benzoxazole grass water emulsion. Cholesterol and grass can prevent wild oats, see Mai Niang, Japanese maiden, yarrow, hard grass and other grass weeds, malignant weeds such as bluegrass have strong resistance to the drug. After grasping the 2nd leaf stage of wheat, the weeds are basically in the same stage and are applied in the 2~3 leaf stage. When the grass age is large, the dosage is appropriately increased. The drug has good safety to wheat and has a wide application period. Normal use in low temperature period usually has no adverse effect on wheat seedlings, but application at higher temperature is beneficial to improve control effect.
Since oxazolamide has been widely used in production for many years, the number of weeds with strong resistance to the drug, such as valerian, hard grass, and Japanese maiden, has risen in many places, resulting in a decrease in control efficiency. . The grass phase and resistance performance of grass weeds in different regions are different, and the dosage should be adjusted accordingly. Hummer 69g/L benzoxazole grass water emulsion, in areas such as Suzhong, Sunan and other resistant weeds, 80mL /667m2 is recommended before winter, and the dosage should be increased to 120~ when the grass age is large. 150mL/667m2, in the northern Jiangsu and other places to see the Mai Niang and other weeds still sensitive to the field of the drug, with 50mL / 667m2 before winter can achieve the desired control.
3 Methyl disulfuron methyl disulfuron is a wheat straw stem and leaf treatment herbicide from Bayer CropScience Co., Ltd., which can prevent annual grass weeds and cattle growth, such as bluegrass, hard grass, maiden, and yarrow. Partial broadleaf weeds. Methyl disulfuron is effective against almost all common grass weeds in wheat fields, especially in the past few years, which can prevent malignant weeds such as valerian and Japanese maiden, which have been resistant to thiazoloxaline. It has a large application area in southern Jiangsu. In the 3-6 leaf stage of wheat, the weeds of grasses are basically out of the same stage, and they are applied early in the 3~5 leaf stage. Generally, Shima 30g/L methyl disulfuron-dispersible oil suspension agent 20mL/667m2 can be used. To achieve the desired control effect, when the field grass is mainly resistant to weeds such as valerian, the dosage can be appropriately increased to 25-30mL/667m2. Spraying is applied, and the water consumption is guaranteed to be above 30kg/667m2.
It is understood that methyl disulfuron has high requirements for application technology, and it is necessary to apply the drug strictly according to the recommended dosage, period and method. In the unfavorable environment that may cause the decline of viability and growth inhibition of wheat seedlings, such as waterlogging, drought, disease, alkaline soil, etc., it cannot be used after the medicine, and there is no significant cooling weather after the medicine, otherwise the wheat will appear dwarf and chlorotic. It is best to apply the medicine before winter, and apply the medicine during the wintering period and spring wheat returning to the green period. After the medicine, it is easy to encounter bad weather, and the risk of phytotoxicity is greater. It is strictly forbidden to use wheat after jointing or planting up to 13cm. Crops such as corn, rice, soybeans, peanuts, and cotton should be sown after 100 days of application, and the drug should be used with caution in the wheat field intercropped with the above crops.
4 acetylene ethinate has obvious control effect on wild oats, maiden, hard grass, yarrow, and stalk grass, and has poor control effect on bluegrass. The earliest registered product in China is Maiji 15% acetylene ester wettable powder from Syngenta Crop Protection Co., Ltd.
The herbicidal effect of acetylene ester is better than that of drugs with a long application period such as fenoxapropion, especially for weeds and hard grasses that have developed resistance to oxacillin. Have good control effect. Another advantage is that it has good adaptability to low temperature. Application in low temperature environment will not cause adverse effects on wheat seedlings (except for some spring wheat varieties). Although the speed of killing grass will slow down, it will not affect the final control effect.
Studies have shown that in some areas in recent areas, some grass weeds have increased resistance to clodinafop. Judging from the large-scale application in production, there are some resistances to acetylene oxalate in Japan in some areas of southern Jiangsu. However, in general, grass weeds in most areas still Performance sensitive. The dosage should be determined according to the type of weeds and the age of the grass. Generally, 15% acetylene acetonide wettable powder 30g/667m2 is used before winter, and 40g/667m2 is used when the grass age is large. In areas with more resistant weeds, the amount of the drug can be increased appropriately, but the dosage should not exceed 60g/667m2, otherwise it will have adverse effects on the growth of wheat seedlings.
5 oxazolinoxazolin ester patented herbicide produced by Swiss Syngenta Crop Protection Co., Ltd., suitable for the treatment of wheat stems and leaves to control a variety of grass weeds such as Mai Niang, hard grass, alfalfa, wild oats, etc. Bluegrass, brome, and wheat are not sensitive to it. The oxazolin has a new action site, and there is no cross-resistance with the drugs such as fenoxapropion and turfgrass.
The application of oxazolin has a wide application period, and can be applied from the heart stage 2 to the booting stage of wheat seedlings. The comprehensive application cost and herbicidal effect are considered, and it is most suitable for application in the 3~5 leaf stage of grass weeds. Afterwards, try to avoid a large amount of cold weather. Ai Xiu 50g / L oxazolinol emulsifiable concentrate is used in wheat fields and wheat fields. The recommended dosage is 80mL/667m2 before winter and 80~100mL/667m2 in spring.
6 Flurazolesulfonate is a patented herbicide produced by Alice Star Biochemicals North America Co., Ltd. It is mainly used to control grass weeds and leeks, wild peas, blue cabbage and other broad-leaved hybrids in wheat fields. grass. The medicine has good control effect on malignant grass weeds, and can effectively prevent grass weeds which are difficult to control by common crops such as bluegrass, ryegrass, brome, and wild oats. Fluazosulfone-based sulfonylurea herbicides have different sites of action with aryloxyphenoxypropionate herbicides such as fenoxapropion, so there is no cross-resistance and can prevent this type of Herbicides produce resistant grass weeds. The combination of flucarbazone and clodinafop-propion has synergistic effects, especially the effect of controlling maimarin and Japanese maiden, and it is currently used in combination with acetylene. Fluazosulfuron has good safety to wheat. It can be applied from wheat 2 leaf 1 heart stage to before jointing. It has low environmental requirements and is a herbicide that can be used to control malignant weeds such as bluegrass in wheat field. A medium with relatively high safety.
Fluazosulfone has both soil closure and stem and leaf treatment effects, preferably before winter. Most of the weeds in the field have been germinated and used in the 2 to 4 leaf stage. When the grass age is above the 5 leaf stage, the dosage is appropriately increased. Generally, the use of Suining 70% fluzolone-sulfonate dispersible granules 3～4.5g/667m2, with 15% clodinafop-propion microemulsion 30mL/667m2, when the grass is older or the field is dominated by malignant weeds such as bluegrass, Use the upper limit of the recommended dose. The efficacy of flucarbazone on hard grass remains to be tested and is not recommended for use in hard grass-based fields. The drug has good adaptability to low temperature frost, but it is best to apply the drug when the maximum daily temperature is higher than 8 °C. Most of the drugs in the soil degraded about 60 days after application, which is safe for the crops.
7 acesulfame acesulfame is a wheat field stem and leaf treatment herbicide from Dow AgroSciences Co., Ltd., which can control a variety of grasses and broadleaf weeds. Currently registered in the country is priority 7.5% acesulfame Water dispersible granules.
It has a wide spectrum of herbicides, and it is common for wheatgrass, Japanese maiden, wild oats, buckwheat, ryegrass, hard grasses, grasses and weeds, wild geranium, Broad-leaved weeds such as leeks, sown wormwood, and sorghum have good control effects, and have poor control effects on bluegrass, alfalfa, and swine fever. According to Cheng Gang, the regional manager of the Dow Agrotechnical Company in the United States, the good control effect on the malignant grass weeds such as A. maiden, ryegrass, wild oats and hard grass is the outstanding advantage of acesulfame. The drug has no cross-resistance with the drugs such as benzoxazole and acetylene oxalate, and can effectively prevent the A. maiden and the Japanese maiden, which have developed resistance to these herbicides, and have occurred in these weeds in the past 2 years. Heavy areas are large in application area.
The mixture of acesulfame is better, and it can be mixed with Maixi 58g/L bisflufamide, chlorflupirtine, chlorsulfuron, bensulfuron, bensulfuron, bromoxynil, 2, 4-chloro, etc. The herbicides used to control broadleaf weeds are mixed to broaden the herbicidal spectrum of broadleaf weeds, but cannot be mixed with oxazolin preparations. The half-life of the drug in the soil is 13d on average, and the residual period is short, which will not adversely affect the crops.
It is understood that the activity of acesulfame is higher, and it should be applied strictly according to the recommended dosage, application period and method, otherwise it may cause phytotoxicity. The 7.5% sulfasalazine water-dispersible granules can be applied in winter and spring, generally 12.5g/667m2. When the grass age is large in spring, the dosage can be appropriately increased, but not excessive, so as to avoid adverse effects on wheat. The sooner the herb weeds are released, the better the drug will be used. The wheat can not be used after the jointing. Some wheat varieties will appear yellowing after application, but will not cause dead seedlings, and can resume growth in the later stage, which has no effect on yield. There should be no large cold weather within 2 days after application, and the drug should be stopped when the minimum temperature is below 0 °C to avoid phytotoxicity to wheat.
The above information is a brief introduction to the wheatgrass herbicides in the wheat field, hoping to help everyone.
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