Due to the increase of weed resistance, the promotion of simplification of cultivation techniques, the expansion of straw returning area and climate anomalies, the occurrence and damage of weeds in autumn crop fields in Tongzhou District is aggravated, highlighting the emergence and emergence of weeding period. The increase in the amount of grass and the increase in the area of ​​refractory weeds increase the difficulty of elimination, posing a serious threat to the production of summer crops. The pre-winter disintegration is a favorable measure to control weeds. At this time, weeds have a small grass age and good control effect, which is of great significance to ensure the increase of production and income in summer. To this end, the following technical opinions are proposed. All localities must attach great importance to it, seize the favorable period, and actively guide farmers to carry out pre-winter disintegration, laying a good foundation for the harvest of summer harvest.
1 wheat field weeding
1.1 Soil closure and early post-emergence treatment
After sowing of wheat to the second leaf stage of wheat seedlings, 150 grams of 50% bensulfuron-isoproturon, or 47 grams of 47% isoamyl-propyl-chloropyridyl WP (Kaip), when the soil is suitable for water, water 40 kg for uniform spray. For the fields where the malignant weeds such as bluegrass and valerian have occurred in the past, try to use them before the sowing until the first leaves of wheat seedlings (before weeding). It can also be used in the pre-emergence of wheat after sowing, using 80% of 33% fluorothiazolidine fur suspension (Baibao), and evenly spraying 40 kg of water.
1.2 stem and leaf treatment
1.2.1 Grass weeds
After the weeds are seedlings, the use of 50 g / liter of oxalic acid ester acetylene oxalate (energy) emulsifiable oil 80 ~ 100 ml, or 15% of acetylene oxalate (maiji) wettable powder 30 ~ 40 grams, Spray evenly with water 30-40 kg. The field of bluegrass, maiden and valerian (mainly in western town) can also be used with 70% fluzolsulfonate water dispersing granules 3~4.5g+15% acetylene ester 30g, or acre. 25-35 ml of 3% methyl disulfuron oil (Shima) suspension agent is sprayed evenly on water 30-40 kg after 3 leaf stage of wheat (weed Qimiao). The field where the sorghum is seriously affected should be treated as close as possible to the soil, and the treatment of stems and leaves should be applied as soon as possible after weeding.
1.2.2 broadleaf weeds
In the 4th leaf stage of early winter wheat or early spring, use 40% chlorofluoperoxyacetate EC 40-50ml, spray 40 kg with water. The following formula can also be used to spray the stems and leaves before the 4th leaf of the wheat to the jointing: 7.5~10g of 36% oxacillin·bensulfuron-methyl (Pentium) wettable powder; or 5.8% of difluoro-razolamide Suspension (Mai Xi) 15 ml; or 40% 2 to 4 chloroisooctyl ester · diflufenacil suspoemulsion 100 ~ 120 ml; or 15% diflufenacil chloroflupiroxime Isooctyl ester suspoemulsion 80 ~ 100 ml. Try to use diflufenacil and oxadiazon as a compounding agent for pigs and leeks.
1.2.3 Gramineous weeds mixed with broadleaf weeds
The above-mentioned related agents can be mixed and used to achieve the effect of preventing two types of weeds at one time, but it should be noted that the oxazolone and its compounding agent should not be mixed with the methyl disulfuron and the herbicide with the dosage form of emulsifiable concentrate. It can also be used in wheat 4 leaves to jointing stage, using 3.6% methyl iodsulfuron-methyl disulfuron-methyl (discrete) dispersible granules 20-30 grams, evenly sprayed with water.
1.2.4 Elimination of wheat fields
For the control of grass weeds, weedyl, oxazolin, for controlling broadleaf weeds, chloroflupiroxime, 2, 4, oxazolone, diflufenacil, etc. Herbicide usage is the same as for wheat fields.
2 rapeseed field weeding
(1) Killing before the broadcast. During the open period before the rice planting, the herbicides were used to control the weeds in the field. The method was to use 30% glyphosate 200-300 ml and 40 kg evenly spray during the Tengjiao period. Live or transplant rapeseed the next day.
(2) Soil treatment before and after planting. For rapeseed fields mainly based on grass weeds, use 80-100 ml of 50% acetochlor EC per acre before or after sowing in the live seeding, before planting, before transplanting or before planting, 40 kg of water evenly after planting the next day. Spray; grasses mixed with broad weeds and broadleaf weeds can be used with 96% sperm metolachlor EC 75-110 ml per acre, evenly sprayed with water before or before planting.
(3) Post-emergence stem and leaf treatment. For rapeseed fields with grasses such as bluegrass weeds, use 40% of ketene emulsifiable concentrate 40 to 50 ml per acre. After transplanting rapeseed, grasses weeds 3 to 5 leaf stage with water 40 kg small machine evenly spray. The rapeseed field, which is dominated by grasses such as hard grass and maiden, can also be sprayed with stem and leaf with 10.8% of high-efficiency flupirtine emulsifiable concentrate. The rapeseed field dominated by broad-leaved weeds, 50-60 ml of 30% herbicide suspension agent per mu, in the 6-8 leaf stage of live rapeseed, the transplanted rapeseed is returned to the green and evenly sprayed with water; the grass weeds For rapeseed fields mixed with broadleaf weeds, use 120% to 200 ml of 12% chlorfenone and herbicide emulsifiable concentrate, or 17.5% of chlorhexidine emulsifiable concentrate, 100-120 ml, in the weeds 40 kg of water spray.
3 matters needing attention
(1) To ensure proper control, the variety of the drug should be on the right path. In the process of applying the drug, the amount of water should be sufficient, and the amount of the drug should be used. The spray should be even and thoughtful, and should not be re-sprayed or leaked. The stem and leaf treatment must adhere to the fine spray. .
(2) When the soil is treated, the field with large amount of straw returning and loose soil should be used after suppression.
(3) Before and after the strong cold current, the temperature is below 5 °C, the herbicides are especially isoproturon, methyl disulfuron (Shima), methyl iodsulfuron methyl disulfuron (Kuan Shima), azole Grass·Benzsulfuron-methyl (Pentium) should not be used to prevent freezing damage; in addition, in abnormal weather conditions such as rain or continuous drought, herbicides should be used with caution to prevent phytotoxicity.
(4) Prohibited herbicides should not be used. It is strictly forbidden to use metsulfuron-methyl, chlorsulfuron single agent and its compounding agent in the wheat field, and it is strictly forbidden to use fensulfuron in rape fields, and it is strictly forbidden to use oxalic acid ester acetylene oxalate (大能), oxazocilin (Puma), acetyl oxalic acid (maiji) emulsifiable concentrate and other agents.
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(Source: Pesticide Newsletter)
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