Comprehensive management of weeds in wheat fields

1 Agricultural measures

(1) Select selected varieties. In order to prevent the spread and harm of weed seeds mixed in the seeds.

(2) Reasonable rotation. The implementation of wheat oil, wheat and other crops, compression of grass area.

(3) Strengthen cultivation management. Before sowing, weeding with weeds such as glufosinate or mechanically killing cockroaches, improve the quality of autumn seeds, strive to broadcast the whole seedlings, enhance the resistance of wheat plants, and improve competitiveness.

2 chemical weeding

2.1 Change the method of application, promote “sealing, killing” and

For many years, chemical weeding has mainly been treated with stems and leaves. With the development of some weed resistance, such as valerian, because of its strong ability to adapt to harsh habitats, high reproductive coefficient, strong resistance, strong damage, and stem The leaf treatment has low efficiency and high cost, which brings great trouble to post-emergence weeding. Therefore, changing the application habits, using the "sealing, killing" and heavy application methods is an effective way to solve the problem of resistant weeds and reduce the cost of purchasing drugs.

(1) Pre-emergence closure and early post-emergence stem and leaf treatment

The herbicide is used for soil sealing and early post-emergence stem and leaf treatment, which can effectively solve the malignant weeds with strong resistance to anti-drug and high post-emergence treatment costs, such as valerian, Japanese maiden, pig mites and缕 / 牛繁缕 and lacquer. At the same time, it can prolong the application period, reduce residues, delay the occurrence and development of herbicide resistance and drug resistance.

(2) Grasping the best window for stem and leaf weeding

The two peak periods of the wheat field are 10 to 20 days after the sowing and after the spring. In normal years, more than 85% of grasses are excavated before winter. Weeds are in the seedling stage. The plants are short and the tissues are young. The ability to compete for fertilizer, water, glory, and space is weak. It is sensitive to the drug. The best time for weeding should be locked in November 20th to December 20th. Last year, affected by autumn sorghum, wheat planting was generally postponed, and the weeding window period was compressed very narrowly. After the year, the weed plants grew, the waxy layer of the epidermis was thickened, and the drug resistance was relatively enhanced. At the same time, weeding before winter can avoid the risk of phytotoxicity of the herbicide after the application of the herbicide in the after-effect period.

2.2 Selection and use of herbicide products

The number and formula of wheat herbicide registration products in China: As of November 12, 2016, there are 890 wheat herbicide registration products (857 PD certificates, 33 LS certificates), and only 78 active ingredient formulas (specific formulas) .

(1) closed weeding

Closed with 33% Baibaoma (fluorothia-pyrylfuran), against the resistance of the Mai Niang / Japan to see Mai Niang, Valerian, hard grass, bluegrass, piglet, mother-in-law and other resistant weeds Prominent, it is conducive to the treatment of resistant weeds.

However, it should be noted that: 1 the whole land should reach the standard of “deep, fine, transparent, flat and real”; 2 the soil should have a certain humidity when using the medicine; 3 the application period should be followed by the rainy soil after sowing, and the natural looseness will fall to the grass. Undergraduate weeds before needles are good; 4 should not be exposed to seed application, can not be re-sprayed, leaking spray.

Closed with 50% arrogant (piracetyl), it can effectively prevent pigs, sorghum, cattle, scorpion, sage, baocai, maijiagong, wild rape, leeks, sage, wild Most of the annual broadleaf weeds such as crane grass.

Note when applying: 1 It is recommended to apply before winter, the smaller the grass age is, the better the effect; 2 The second dilution should be applied when dispensing; 3 The amount of water should be used to keep the soil moist; 4 Before the application, finely rectify the field. After sowing, cover the soil tightly, and do not turn the topsoil after the medicine; 5 keep the soil moist after application.

(2) Stem and leaf treatment

1 grass weed

Use 6.9% humulus (fine oxacillin), 15% wheat (arsenyl), 5% macro (oxazoline acetylene), 3% Shima (methyl disulfuron), 3.6 % kelma (disulfonate iodide), 4% priority (acesulfame), etc., can also be tested and promoted 0.8% acesulfame · 5.2% oxazolin and 1% acesulfame 79% isoproturon, but also flucarbazone, dexamethasone and trimethoate.

Judging from the actual use effect, many places look at Mai Niang/Japan to see Mai Niang's resistance to oxazocilin (anti-drug), and it is used in low temperature or grass age, and the control effect is poor.

Oxazoline acetylene oxalate has excellent control effect on grass weeds, but in some areas, Japan has a certain resistance to (resistance) to acetylene ester. It should be noted that when the grass age is small, the drug is used or the dosage is appropriately increased.

The acesulfame has excellent control effect on looking at Mai Niang/Japan, and it also has good control effect on wild oats, wild geranium, and sage. However, the control effect against alfalfa, bluegrass, and swine fever is not ideal. If used improperly, it will cause yellowing and seedling of wheat leaves, which usually has no effect on the final yield.

Methyl disulfuron-methyl and disulfonate-iodronone have good control effects on most grassy weeds such as Mai Niang in Japan, but the risk of using phytotoxicity in winter and spring is relatively high, and the application should be strictly applied according to the requirements of medication.

Acetyl oxalate should be avoided in combination with bentazone, 2, 4-chloro or 2,4-D. In addition, Ningmai and some Yangmai series are sensitive to it and should be used with caution.

Fluazosulfuron has a good effect on buckwheat, wild oats, bluegrass, amaranth and sedge weeds.

2 broadleaf weeds

Use 75% bensulfuron, 56% 2 methyl 4-chloro sodium salt, 15% Chunjie (difluoro-chlorofluoropyr), 20% sharp super wheat (difluoro-fluorochloroester), sharp super wheat + oxalofen 20% to make it swell or 20% chlorhexidine or 20% merlon or 28.8% flufenoxyacetic acid, 41% Benzin (oxazolyl + diflufenacil), 3% spring (difluoro ·oxazolone), 36% Pentium (oxazasulfone), 70% 2 methyl chlorofluoropyrazole. Also available are 2A·difluoro, chloropyrazolone, benzoxazole·chlorofluoropyrazole, benzoxazole·2 sodium, bisfluoro·octyloctylate, difluoro-zolazine, difluoro-benzene Sulfon, 2 methyl chloride, difluoro, chloropyrazole, difluoro, and the like. For special grasses such as big nest vegetables, rice leeks, small oysters and wild cockroaches, a single agent such as clopyralid or dicamba can also be used.

The bensulfuron-methyl is less sensitive to swine fever, sauerkraut, leeks, lacquer, and pompeina, and is not sensitive to stagnation, snail, and scorpion. As for swine fever, it is recommended to apply in the first round of leaf stage, or mixed with bensulfuron-methyl and oxazin; in areas where small sputum, snail flower, and lacquer are severe, can be mixed with 2,4-D, 2 4 chlorine mixed; in the severe area of ​​the mother-in-law, can be mixed with flufenacetate.

Fluroxypyroxyacetic acid has good control effect on most broad-leaved weeds, but has poor effect on older cruciferous weeds. The effect on the mother-in-law is average. Ze paint, wheat blue cabbage, Baogai grass, Tongquan grass, attached vegetables, amaranth, etc. have certain resistance, it is recommended to mix with 2 A 4 chlorine to prevent. It is worth noting that the grass age is increased and the dosage is increased.

Oxazin·bensulfuron can prevent most broadleaf weeds. Do not add auxiliaries when using. It is best not to use it when it is dry or cold. Avoid mixing with acetylene ester and emulsifiable pesticides . It is forbidden after wheat jointing and needs to be diluted twice.

2 A · Difluoro can prevent a variety of broad-leaved weeds, including pig mites, sage and amaranth that are resistant to benzosulfuron.

Difluoro-chlorofluoropyrazole can effectively prevent leek, pig bristle, sorghum/cow, scorpion, lacquer, snail, etc., and has good miscibility. However, the speed of dead grass is slow, and it is relatively weak against sowing.

Difluoro-fluorochloroester is resistant to swine fever, sown wormwood, leeks, baocao grass, and big nest vegetables, and is not restricted by leaf age and application temperature; weeding does not recur completely; it can be used in different periods of wheat. No phytotoxic hazards.

Difluoxazolone can prevent pig mites, sown wormwood, leeks, sorghum / ox yam, lacquer, Maijiagong, etc., especially for resistant sage and pig scorpion.

3 Weeds

Use 3% Shima (methyl disulfuron), 4% priority (mesochlor), 3.6% valerol (disulfonyl iodide), or methyl disulfuron and diflufenacil , 2,4-diisooctyl ester, acetylene ester compounding agent, or isoproturon combined with bensulfuron-methyl, bensulfuron-methyl, propidium, thiophenesulfuron, clodinafop, flufenic acid A compounding agent, or a compounding agent of clodinafop and diflufenacil, flufenoxyacetic acid, bensulfuron-methyl, etc., may also be selected by using pyridine chlorofluoropyrazole or the like.

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