Five herbicides that lead and promote the chemical elimination of wheat field performance characteristics and application brief analysis

The five types of wheat field herbicides, namely, Spermoxazole, Metsulfuron, Metsulfuron + Methyl iodosulfuron, Furazone + Flufenacet + Pyrofluroxypyr, Pyrofluroxyfen, belong to different categories, exhibit different mechanisms of action, have single-agent as well as compounded products, all of them are added with safeners, and processed to be of different contents, different dosage forms and different application methods, and are under the protection of patents and have already been out of the period of protection respectively. Various products in different periods or a certain angle had led and promoted the domestic wheat field chemical weed control, but also have certain deficiencies, there have been some problems in the production, the continuous technical improvement and application of perfect increasingly play a greater role. According to the author's field survey and summarize the application of feedback information, reference to relevant scientific and technological literature and exchange with some people in the industry, briefly analyze the performance characteristics of each product, the effect of field weed control, the production of problems and the application of prospects for predicting the application of enterprise applications for the registration of products, dealers and farmers to apply to provide relevant information, in order to make a better service for weed control in wheat fields.

First

Sperm_azoxaflutole + safety agent, an aryloxypropyl herbicide

A phenoxypropionic acid herbicide, acetyl coenzyme A carboxylase (ACCase) inhibitor, systemic selective stem and leaf treatment. Stem and leaf absorption, conduction to the leaf base, internode meristematic tissue, root growth point, rapidly transformed into harmful substances, damage to the weed growth point, meristematic tissue, resulting in necrosis of the base of the tiller, leaf loss of green to purple, and finally dried up and died. Commonly used products in the market are 6.9% water emulsion, 10% emulsifiable concentrate. The application performance is that it can prevent and inhibit many kinds of grass weeds in wheat field, especially for wild oats and maidenhair with outstanding preventive effect. Advantages: Normal use, high safety to wheat under non-extreme weather conditions, rarely produce serious irreversible damage; can be compounded with many kinds of chemicals, including broadleaf grass and grass chemicals, such as flurfenoxuron, isoproturon, benzenesulfuron, thiophenesulfuron, acyl sulfosulfuron, bromobenzonitrile and so on, which can improve the efficacy and enlarge the spectrum of grass-killing; the cost is relatively low and cost-effective; the application technology for wheat growers is relatively mature. Insufficiency: the effective grass-killing spectrum is narrower, and it has poor preventive effect on many kinds of grass weeds that are rapidly rising and spreading in wheat field, such as knapweed, sparrow wheat, multiflora ryegrass, _grass, hard grass, etc., which is dwarfed by some newly developed high-efficiency agents, and is ineffective for broad-leaved grass; it is restricted to compound with some agents, such as zoxazolone, benzoxycarboxylic acid and benztasone, and it is easy to produce chemical damage, especially when compounding with zoxazolone in the state of emulsified oil, which will inevitably produce chemical damage. The compounding of azoxystrobin is bound to produce drug damage.

Azoxystrobin without safener was initially used only in broadleaf crop fields to control grass weeds, and was registered for use in winter wheat fields in the 1990s, and was the earliest agent used in winter wheat fields for stem and leaf treatment to control grass weeds. Available materials report that it can also be used in barley fields with the addition of a safener. In rice field, there are also registered varieties of application and compounding, which show very good preventive effect against difficult barnyard grasses, but the safety risk is large, and the agricultural authorities do not advocate the registration of application. Comprehensive analysis that the product in the winter wheat field still has a certain market, but it is difficult to have a rising space, gradually tending to decline trend, compounding and mixing is an effective measure to expand the market.

Second

Methanedisulfuron + safety agent, is a sulfonylurea herbicide

For acetolactate synthase (ALS) inhibitors, endosulfuron selective stem and leaf treatment, the agent is absorbed by the stem and leaves, to prevent the biosynthesis of branched-chain amino acids and other biosynthesis, which in turn stops the cell division, and gradually die. Commonly used products on the market are 3% oil suspension or 30g/liter oil suspension, respectively, plus Companion Bao bucket mixing application, the recent market also has 1% oil suspension. Advantages: high activity, low dosage, no more than 1.2 grams per mu of active ingredient; broad spectrum of grass killing, almost all grass weeds occurring in the wheat field have a good effect, especially the rapid spread of malignant weeds, knapweed, multiflora ryegrass, morning glory and so on, for the prevention and elimination of grass weeds in the wheat field to kill the broadest spectrum of effective pharmaceutical agents, the same kind of any other agents can only be expected to be out of reach. The shortcomings of the drug technology is relatively strict: First, the amount of drug is strictly limited, mu with the highest active ingredient can not be more than 1.2 grams; second, the drug period is relatively short, wheat 3 leaves 1 heart to the spring before the rise of the best use of the drug period, 3 leaves before and after the spring after the 30 cm high prohibited use of the drug, otherwise prone to drug damage and difficult to recover; third is the use of the drug environment requirements are strict, the nighttime temperature is below freezing or frost, the highest temperature during the daytime below 8 degrees below, not recommended for use, low-lying waterlogged land or rain in the field when there is standing water can not be used; Fourth, some varieties are sensitive, strong gluten, angular wheat should be tested and then promoted; Fifth, the compounding of pharmaceuticals is limited, can not be compounded with longer residual period of pharmaceuticals; Sixth, the disease seedling weak seedling field, autumn sowing seedless field can not be used.

Faced with the rapid spread of a variety of intractable grass weeds in the wheat field, other agents are difficult to work, only the product is unique. At present, the domestic has passed the patent protection period, predicted that the amount will be faster, in the registration of the effective state of the 8 original drug companies, 23 preparation manufacturers, in the application for registration of experimental enterprises is also rapidly increasing, for the market to provide strong support for the application. In the face of the product in the wheat field has occurred a lot of drug damage to the real situation, we can not be bitten by a snake, three years afraid of the well rope, but also to forget the past, to effectively improve the scientific use of drugs, with the application of technology continues to improve, the phenomenon of drug damage will be increasingly reduced or no longer occur.

Third

Methanedisulfuron-methyl+methyl iodosulfuron-methyl compound

Selective stem and leaf treatment agent. Methyl disulfuron as previously described will not be repeated. Methyl iodosulfuron has the same classification status, mechanism of action and application method as the former, but it has a completely different grass-killing spectrum, and its target is a variety of broadleaf grasses in wheat field, and it is safe for wheat, has no adverse effect on the crops of the later crop, and has good compatibility with the environment. This drug combines two kinds of highly active agents with different grass-killing spectrums and shows certain synergistic effect. Only 3.6% water-dispersible granules with a safety agent are available on the market, plus the application of BANPOWER Bucket Mix. Advantages: high activity, low dosage, preparation mu dosage of 25~35 ml; grass-killing spectrum is wide, almost all grass weeds and common broad-leaved grasses in wheat field have good preventive effect, for the current wheat field to kill the broadest spectrum of grasses, preventing the effect of good herbicides; easy to apply without re-mixing with other agents, a spraying time-saving, labor-saving, labor-saving. The disadvantage is that the application technology is relatively strict. There are only 6 registered effective status of this product, including sub-assembled products, but there are unofficially registered follow products in the market. Because the product is a high-end pharmaceutical compounding, excellent performance and application technology is becoming more mature, has a good application prospects.

Fourth

Furosemide + flufenacet + pyraclostrobin compound selective systemic soil treatment agent

Furosemide, carotenoid synthesis inhibitor, selective pre-seedling or early post-seedling treatment, the agent absorbed through the roots and shoots showed rapid poisoning, plant green and white death. The earliest foreign mainly used in cotton, peanut, sunflower, pea fields, later developed for black wheat, wheat fields, can prevent and eliminate a variety of grass and broadleaf weeds. Flufenacet, belonging to aryloxyethylamine, cell division and growth inhibitor, selective systemic soil treatment agent, applied before or early after seedling, can prevent and kill many kinds of grass weeds and some broad-leaved grasses in wheat field, and it is also applied in soybean, potato and sunflower crops in addition to being registered in wheat and maize fields in foreign countries, which is safe for crops and friendly to the environment. Pyraclostrobin, a pyridine carboxamide, carotenoid synthesis inhibitor, selective systemic soil or stem and leaf early treatment. Weeds mainly rely on the roots of young shoots to absorb, sensitive weeds after damage to the plant body carotenoids decline, and then destroy chlorophyll synthesis, cell rupture, young shoots decolorization or whitening death. This agent can prevent and eliminate many kinds of broadleaf grass and early harvest in wheat field. The performance of the drug period is wide, can be pre-seedling or post-seedling early soil treatment; holding period is long, in the soil surface layer of the formation of effective weed control film, the spring delayed emergence of weeds is also stable efficacy; can be mixed with a variety of agents can be compounded, showing better performance. In foreign countries, it is also used in carrot, sunflower and pea fields, and in China, it is also used as a compound soil treatment agent in garlic fields. Previously, winter wheat fields rarely applied soil treatment for chemical removal, but also only a single agent, did not attract the attention of the industry. The drug to three different weed killing spectrum and each has its own strengths of the agent compound together, almost can prevent and control all the weeds in wheat field, from the theory and practice of the application of the effect of the wheat field soil chemodemolition forward a long way, so that the wheat field chemodemolition measures are more abundant. Compared with stem and leaf treatment, it shows a lot of advantages: the dosing period is greatly advanced, completely avoiding the influence of extreme temperatures, which is conducive to ensuring and exerting the efficacy of the drug and is not easy to produce drug damage; it is very convenient to use the drug, and the wheat field sown in autumn is generally leveled and not affected by the grass seedlings, so it is easy to make the spraying uniform, and there are few other crops in the field, so there is no need to worry about the drift of the drug damage; the wheat field sown after the preparation of the ground is free of weeds on the surface, and the seeds of weeds in the soil develop uniformly, and the seeds of weeds in the soil develop uniformly. The development of weed seeds in the soil is consistent, which can improve the effect of prevention and eradication; the prevention and eradication of weeds is placed before the young shoots, which effectively prevents the competition with wheat for water, nutrients and space, and is very conducive to the early development of strong grasses and the improvement of effective tillering, which guarantees the safe overwintering of wheat and lays the foundation for a high yield and abundant harvest; there is enough recovery time for general minor drug damage, and the use of the drug ahead of time is conducive to the alleviation of the residual damage to the soil of the next crop. Shortcomings: there are certain safety risks for wheat seedlings with open seeds and roots; the preventive effect on some hard-to-treat malignant grasses is not good; the operation cost of enterprises is on the high side. At present, there is only 33% suspension agent on the domestic market, and the registration effective status is until June 2017. According to the information released by the Pharmaceutical Inspection and Quarantine Institute, after the relevant materials are made up, it will be formally registered. The application promotion of this product is lower than expected due to the traditional advantages and price point of wheat field stem and leaf chemigation, but the introduction of this product will definitely affect the pattern of medication for wheat field chemigation. Incomplete statistics, in the registration application test of wheat field pre-seedling and early post-seedling application of soil treatment agent has 56 manufacturers, to obtain the relevant original drug registration documents have been 10 companies, the application of these product resources and the impact of attention to expect.

Fifth

The active ingredient of pyraclostrobin

The single product of this agent has already been registered by three manufacturers, two of which are 50% wettable powder, and one of which is 500g/liter suspending agent. From the existing registration application test and field application, it shows that diflufenican has been compounded with many kinds of agents, including soil treatment, stem and leaf treatment, anti-graminaceous agents and broad-leaved agents, such as bensulfuron, isoproturon, azoxystrobin, sodium 2-methyl-4-chloride, methanedisulfuron, flufenacet, diflufenzosulfuron and so on, and processed dosage forms are wettable powder, water-dispersible granule and suspension agent. The launch of many kinds of compounding agents will certainly broaden the application prospect of diflufenican.