CN104430455B - A kind of mixed herbicide containing sulfasulfuron-methyl, dithiopyr and flumesulam - Google Patents

Abstract

The invention discloses a kind of mixed herbicide containing flazasulfuron, dithiopyr and Flumetsulam, this herbicide is with flazasulfuron, dithiopyr and Flumetsulam as principle active component, wherein, flazasulfuron, dithiopyr are 0.1～80:0.1～80:0.1～80 with the mass ratio of Flumetsulam.Weeding before present invention can apply to lawn Seedling, after Seedling, particularly applies various grass family, Cyperaceae and broad leaved weed in Weeds in Turf, and effect is notable.The present invention has higher synergistic function, delays Weed Resistance, and herbicidal spectrum is wide, and the lasting period is long, and lawn is had safety, and its effect uses apparently higher than single dose.

Description

A kind of mixed herbicide containing sulfasulfuron-methyl, dithiopyr and flumesulam

technical field

The invention belongs to the technical field of pesticides, and relates to a herbicide, in particular to a ternary mixed compound of pyrimsulfuron-methyl, dithiopyr and flumesulfame, and the herbicide composition can be applied to lawn seedlings Weeding before and after emergence.

Background technique

With the acceleration of my country's urbanization process, the improvement of urban greening standards and the substantial growth of urban areas, various lawns have emerged as the times require, which has triggered a huge demand for lawns, and the development of the lawn industry has good business opportunities. Lawns are important auxiliary facilities in terms of ensuring the solidity and beauty of infrastructure such as roads, railways, airports, reservoirs, river banks, and lake embankments; in terms of urban construction and landscaping, lawns can greatly improve the living environment and effectively reduce the city's "heat island" effect". The area and quality of lawn green space reflect the environmental quality and civilization of the city. Cities in some developed countries such as the United States and the European Union regard the lawn industry as one of their pillar industries. At present, my country's lawn industry has developed greatly, but has not yet formed a complete integrated industrial system. Lawn plays an important role in my country's urban construction, beautification of living environment and improvement of people's spiritual civilization. It not only has high economic benefits, but also has huge ecological and social benefits.

However, due to improper management, the quality of many lawns has declined, and problems such as lawn grass death, overgrown weeds, and pests and diseases have occurred frequently, seriously reducing the use value and landscape value of lawns, and causing a lot of waste of funds. Therefore, research on lawn management technology, especially The lawn weeding technology is an important measure to change the current state of the lawn and improve the ecological environment.

Manual weeding requires a lot of labor, and the weeding is not thorough, and it has the disadvantage of trampling the lawn, thereby reducing the quality of the lawn. In some places, the lawn has to be replaced, which costs a lot. Chemical weeding saves labor and time, low cost and high efficiency, and less weeds in the later stage, which is incomparable to manual weeding. Moreover, chemical weeding also has a sealing effect, and there will be much fewer new weeds in the future. Chemical weeding has less disturbance to the lawn and provides a reasonable environment for the growth of turfgrass. The cost of weeding is low, the one-time cost is 1/3-1/4 of the labor cost, and the annual cost is 1/4-1/5 of the labor cost. The labor intensity is low, and one person can spray 7-9 acres of lawn every day. The spraying efficiency of the machine is higher, and it has the advantage of weeding a large area. In order to reduce the economic loss caused by weed damage and reduce labor intensity, chemical weeding has been gradually accepted by people because of its convenience, quick effect and long control time.

Flazasulfuron is a sulfonylurea herbicide developed by Ishihara Sangyo Chemical Company in Japan. The chemical name is 1-(4,6-dimethoxypyrimidin-2-yl)-3-(3-trifluoromethyl-2-pyridinesulfonyl)urea, and its structure is shown as follows:

Fluesulfuron-methyl is an acetolactate synthase (ALS) inhibitor. Primarily inhibits the reaction of acetolactate synthase which produces the precursors of the side chain amino acids, leucine, isoleucine and valine. The agent has a wide herbicidal spectrum, not only excellent in controlling annual broadleaf and grass weeds in the lawn, but also controlling perennial broadleaf weeds and sedge weeds, such as crabgrass, barnyardgrass, goosegrass , Bluegrass, Mai Niang, Setaria, Cyperus cyperi, Water centipede, Broken rice sedge, Special-shaped sedge, Hollow lotus seed grass, Small flying canopy, White clovergrass, Tianhutu, clustered curl ear, sorrel, small nest Vegetables, purple flowers, corn grass, sorrel leaf Polygonum, sheep's trotters, bandi brocade, plantain, mugwort, yellow flowers, green amaranth, shepherd's purse, treasure cover grass, nest vegetables, chickweed, etc., for short-leaved water centipede , crabgrass and Cyperus cypericus have excellent control effects.

Under normal circumstances, weeds stop growing immediately after treatment, and the newly issued leaves chlorosis after 4-5 days of absorption, and then gradually necrosis and spread to the whole plant 20-30 days, weeds are completely dead. The agent can be absorbed through the stems and leaves of weeds, and can also inhibit the germination of weed seeds in the soil. The control time is longer, and the duration of effect is about 40 days or more in spring and summer, and more than 120 days in autumn and winter.

Fluasulfuron-methyl is the first special herbicide officially registered on warm-season lawns (zoysia and bermudagrass) in China. Zoysia and Bermudagrass turfgrass can quickly decompose and convert the medicament into non-toxic substances after contacting the medicament, which will not affect the normal growth of the lawn and is highly safe to turfgrass. Used during the dormancy period of the lawn, it will not affect the germination and growth in the future. Widely used in greening lawns, golf courses, etc.

Dithiopyr is a pyridine herbicide developed by Monsanto and Rohm and Haas. Chemical name: Dimethyl 2-difluoromethyl-4-isobutyl-6-trifluoromethyl-3,5-pyridinedithiocarbamate. Its structural formula is as follows:

Dithiopyr is a pre-emergence herbicide of pyridine carboxylic acid. Its herbicidal activity is not affected by changes in environmental factors, and its persistence period can reach 80 days. It can control annual weeds such as barnyardgrass, foxtail, bermudagrass, special-shaped sedge, knotweed, and narrow-leaf Alisma. Apply before the emergence of the lawn, the dosage is 0.36-0.50kg/hm ² , it can control the annual grass weeds such as asparagus crabgrass, purple crabgrass, etc. weeds.

Flumetsulam is a triazolopyrimidinesulfonamide herbicide developed by Dow Agroscience. Chemical name: 2',6'-difluoro-5-methyl(1,2,4)-triazolo(1,5-a)pyrimidine-2-sulfonanilide, its structure is shown as follows:

Flumesulam is a typical acetolactate synthase inhibitor. By inhibiting the synthesis of branched-chain amino acids, protein synthesis is blocked, and plants stop growing and eventually die. Flumesulam has a strong systemic conductivity, and it is a relatively slow process from the plant absorbing the drug to the occurrence of damage symptoms until the plant dies. Symptoms after the weeds absorb the pesticide are: the midrib of the leaves loses chlorosis, the veins and tips fade, the heart leaves start to turn yellow, white, purple, the internodes become shorter, the terminal buds die, and finally the whole plant dies.

Flumesulam is a broad-spectrum herbicide. Long residual effect period, broad herbicidal spectrum, suitable for soil, stem and leaf treatment. It can control most annual and perennial broad-leaved weeds, and it can also inhibit young grass weeds, such as velvetleaf, quinoa, chickweed, thorn flower, pig's weed, mandala, retroverted amaranth, sweet sweet Chrysanthemum, wild radish, etc. have excellent control effects, and also have significant control effects on many cruciferous weeds such as Polygonum, Kochia, Solanum nigrum, Wild sesame, Popona, wild watermelon seedlings, cocklebur, Fenghuacai, and bluegrass , has good activity on foxtail and iron water chestnut.

At present, lawn herbicides are limited by safety and herbicidal spectrum is also limited. A single herbicide alone cannot completely and effectively control the occurrence of lawn weeds. Long-term use, excessive dosage or uneven application are likely to cause residual toxicity.

Contents of the invention

The object of the present invention is to provide a mixed herbicide containing rimsulfuron-methyl, dithiopyr and flumetsulam.

Another object of the present invention is to provide the application of the herbicide in lawn weeding.

In order to achieve the above-mentioned purpose, the present invention selects different herbicide spectrums, three kinds of herbicides, rimsulfuron-methyl, dithiopyr and sulfaflufenacil, which have complementary advantages and disadvantages, and are formulated into a mixture for use after appropriate reduction. Grass spectrum, significantly improves the weeding effect, and also avoids the possibility of phytotoxicity and residual poisoning on the lawn. The present invention specifically adopts the following technical solutions:

A mixed herbicide containing sulfasulfuron-methyl, dithiopyr and sulfaflufenacil, the herbicide uses sulfasulfuron-methyl, dithiopyr and sulfaflume as the main active ingredients, wherein sulfaflume The mass ratio of rimsulfuron-methyl, dithiopyr and rimsulam is 0.1-80:0.1-80:0.1-80.

The mass ratio of pyrasulfuron-methyl, dithiopyr and flumetsulam in the mixed herbicide is preferably 1-70:1-60:1-60. The mass ratio of sulfasulfuron-methyl, dithiopyr, and flumetsulam is more preferably 1-5:1-60:1-25.

In one technical solution, the mass ratio of sulfasulfuron-methyl, dithiopyr and flumetsulam is preferably 1-5:1-5:1-25.

In another technical solution, the mass ratio of sulfasulfuron-methyl, dithiopyr, and fensulfame is 1:1:18 or 3:2:25 or 5:4:1 or 3:60:2 .

In the mixed herbicide of the present invention, the mass percentage of flusulfuron-methyl, dithiopyr and fensulfame in the herbicide is 1-85%, preferably 15-80% by mass , the most preferred mass percentage is 10-65%.

In the ternary compound preparation of flusulfuron-methyl, dithiopyr and flumetsulam of the present invention, in addition to active ingredients such as flusulfuron-methyl, dithiopyr and flumetsulam, you can also add Adjuvants and excipients such as conventional surfactants, thickeners, solvents or solid fillers allowed on pesticide preparations are formulated into any dosage form allowed on pesticides. It is preferably processed into suspensions, wettable powders, water-dispersible granules, emulsifiable concentrates, and microcapsules.

The invention can be applied to the weeding before and after the emergence of the lawn, especially for controlling various grasses, sedges and broad-leaved weeds in the lawn, and the effect is remarkable.

The herbicide composition of the present invention has the following advantages:

1. Synergistic effect and high herbicidal activity. Both sulfasulfuron-methyl and sulfaflufenacil are acetolactate synthase inhibitors. It is mainly absorbed by the roots and stems and transported from the transport tissue to the meristem, inhibiting the biosynthesis of branched-chain amino acids (such as serine and isoleucine). Dithiopyr is a pre-emergence herbicide of pyridine carboxylic acid. Its herbicidal activity is not affected by changes in environmental factors, and its persistence period can reach 80 days. That is to say, the herbicide composition of the present invention can kill weeds through different ways, produce higher synergistic effect, and can greatly improve the herbicidal activity of the herbicide.

2. Broad herbicide spectrum and long duration. After the combination of pyrasulfuron-methyl, dithiopyr and fensulfame, the effects are complementary, and the weeding spectrum is wider, and pyrasulfuron-methyl is mainly effective against broad-leaved weeds and Cyperaceae weeds, and can spread Toxic soil or spray; Dithiopyr can control grasses and some annual broadleaf weeds. However, pyramsulam can control most annual and perennial broad-leaved weeds, and can also inhibit young grass weeds, and can be treated with soil and stems and leaves. Therefore, the herbicide of the present invention has dual functions of foliage treatment and land sealing, prolonging the duration of the agent. Therefore, the herbicide of the present invention has dual functions of foliage treatment and land sealing, prolonging the duration of the agent.

3. Delay weed resistance. Because weeds are easy to produce resistance to sulfonylurea herbicides, and the herbicide of the present invention contains pyridine herbicide dithiopyr and triazolopyrimidine sulfonamide herbicide flumesulam, so that the medicament can The weeds resistant to sulfonylureas are effectively controlled, and in addition, the resistance of weeds is reduced, and the service life of the agents is prolonged.

4. High security. The herbicide composition of the present invention is applied to lawn weeding, which can prevent and control various grasses, sedges and broad-leaved weeds in the lawn, and has safety for the lawn under the premise of improving the efficacy.

Therefore, the mixed herbicide of the present invention can be used in the preparation of herbicides for lawn weeding, especially in the control and control of various grasses, sedges and broad-leaved weeds in lawns.

detailed description

Example 1

Flusulfuron-methyl 1%, dithiopyr 1%, fensulfame 18%, alkylphenol polyoxyethylene ether 4%, polyoxyethylene polyoxypropylene block compound 5%, thickener 2% , vegetable oil to 100%, according to the conventional preparation method, it is prepared into a suspension concentrate with a mass percentage of 20%.

Example 2

Flusulfuron-methyl 3%, dithiopyr 2%, rimsulam 25%, NN0 (sodium methylene bis-tetrasulfonate) 9%, alkylphenol polyoxyethylene ether 5%, lignosulfonic acid Sodium up to 100%, according to the conventional preparation method, it is prepared into a suspending agent with a mass percent content of 30%.

Example 3

Flusulfuron-methyl 5%, dithiopyr 4%, fensulfame 1%, sodium lignosulfonate 7%, sodium dodecylbenzenesulfonate 5%, ammonium sulfate 5%, diatomaceous earth top up 100%, according to the conventional preparation method, it is prepared into a water-dispersible granule with a mass percent content of 10%.

Example 4

rimsulfuron-methyl 3%, dithiopyr 60%, rimsulam 2%, NNO (sodium methylenebisturate sulfonate) 6%, sodium lignosulfonate 5%, white carbon black 9%, Kaolin makes up 100%, and is formulated into a wettable powder with a mass percent content of 65% according to a conventional preparation method.

Example 5

Flusulfuron-methyl 70%, Dithiopyr 5%, Flumesulam 5%, NNO (sodium methylenebisturate sulfonate) 5%, Sodium lignosulfonate 4%, White carbon black 5%, Kaolin makes up 100%, and is formulated into a wettable powder with a mass percent content of 80% according to a conventional preparation method.

Example 6

Flusulfuron-methyl 10%, dithiopyr 10%, rimsulam 60%, NN O (sodium methylene bis-tetrasulfonate) 9%, alkylphenol polyoxyethylene ether 5%, lignin sulfonate Sodium acid to 100%, is mixed with the emulsifiable concentrate that mass percent composition is 80% according to conventional preparation method.

Example 7

1), indoor activity determination test

Using the preparations in Examples 1-4, their co-toxicity coefficients to the common lawn weed Foxtail were determined.

Test method: Sow quantitative seeds of Setaria in 9cm disposable paper cups, sow 10-15 seeds in each cup, and cultivate them in a light incubator. Spray treatment on the agent. Continue to cultivate in the greenhouse after treatment, regularly observe the control effect of each treatment on weeds, weigh the fresh weight of weeds after each treatment after 30 days, and calculate its toxicity regression curve and co-toxicity coefficient according to the method proposed by Sun Yunpei et al. in 1960 . A co-toxicity coefficient greater than 120 indicates that the three effective substances have a synergistic effect, a co-toxicity coefficient greater than 100 indicates that the three effective substances have a synergistic effect, and a co-toxicity coefficient of less than 100 indicates that the three effective substances have an antagonistic effect. The measurement results are shown in Table 1.

Table 1 The results of indoor activity determination

It can be seen from the above table that the co-toxicity coefficients of the three effective substances after compounding are all greater than 120, indicating that the present invention has obvious synergistic and synergistic effects.

2), field efficacy test

Drugs for testing:

Four kinds of ternary compound herbicides in Examples 1-4.

Comparative drug:

25% flumesulfuron water-dispersible granules (commercially available), 32% dithiopyr emulsifiable concentrate (commercially available), 80% flumesulfame water-dispersible granules (commercially available).

For the test lawn: Bermudagrass

Bermudagrass is in the 3-5 leaf stage, with good growth, strong plants, and no other diseases and insect pests.

Prevention object:

Alisma, sedge, apple, spinach, arrowhead, special-shaped sedge, chickweed, crabgrass, foxtail, barnyardgrass, goosegrass and other lawn weeds.

experiment method:

Accurately weigh various agents according to the area of the test plot, and after diluting with water, use a knapsack sprayer to spray evenly, and the nozzles are herbicide-specific fan-shaped nozzles. When spraying, pay attention to spraying the liquid medicine evenly into the test area, so that there is no leakage or overspray.

After the test, weed death was observed at 20 days and 40 days after application, and the herbicidal activities of various agents were compared. In addition, the growth of the lawn should be observed within 1 to 15 days after the application to investigate whether the pesticide has phytotoxicity on the lawn.

Embodiment of the present invention preparation weeding test effect sees following table 2 (20d after medicine) and table 3 (40d after medicine)

Table 2 Field drug efficacy test results (20 days after drug treatment)

Table 3 Field drug efficacy test results (40 days after drug treatment)

It can be seen from Table 2 and Table 3 that the present invention has significant control effects on grass weeds, sedge weeds and broad-leaved weeds, with remarkable synergistic effect and long lasting effect.

Table 4 Results of investigation on the safety of pesticides on turf

The lawns in each treatment plot were growing well, and no drug spots were seen, indicating that various chemicals were safe to the lawn.

Claims (5)

1. A mixed herbicide containing sulfasulfuron-methyl, dithiopyr and fensulfame, characterized in that the herbicide is mainly effective with sulfasulfuron-methyl, dithiopyr and sulfaflume Ingredient, the mass ratio of pyrasulfuron-methyl, dithiopyr and fensulfame is 1:1:18 or 3:2:25 or 5:4:1 or 3:60:2; The mass percentage content of dithiopyr and fensulam in the herbicide is 15%. 2. the mixed herbicide containing sulfasulfuron-methyl, dithiopyr and fensulfame according to claim 1, characterized in that it uses sulfasulfuron-methyl, dithiopyr and fensulfame It is formulated into any dosage form for the main active ingredient and the adjuvants and excipients allowed on the pesticide. 3. according to the mixed herbicide containing rimsulfuron-methyl, dithiopyr and flumetsulam described in claim 2, it is characterized in that described dosage form is suspension concentrate, wettable powder, water dispersible granule , EC. 4. The application of the mixed herbicide containing rimsulfuron-methyl, dithiopyr and flumetsulam according to claim 1 in pre-emergence and/or post-emergence weeding of lawns. 5. The application of the mixed herbicide containing rimsulfuron-methyl, dithiopyr and flumetsulam as claimed in claim 1 in controlling various Gramineae, Cyperaceae and broad-leaved weeds in the lawn.