CN104686553A - Mixed herbicide containing flazasulfuron and halosulfuron-methyl - Google Patents

Abstract

The invention discloses a mixed herbicide containing flazasulfuron and halosulfuron-methyl. The herbicide takes flazasulfuron and halosulfuron-methyl as the main effective components, and flazasulfuron and halosulfuron-methyl are in a mass ratio of 1-80:1-80. The mixed herbicide provided by the invention has significant application effect in lawn weeding, especially in control and elimination of various Gramineae, cyperaceae and broadleaf weed in lawn. Relative to a single agent, under the premise of improving the efficacy, the herbicide provided by the invention delays the weed resistance and has wide weeding spectrum, long duration and safety to lawn.

Description

A kind of mixed herbicide containing pyrazosulfuron-methyl and clopyrazosulfuron-methyl

technical field

The invention belongs to the technical field of pesticides, and relates to a herbicide, in particular to a binary mixed compound of pyrazosulfuron-methyl and chlorpyrazosulfuron-methyl, the herbicide composition can be applied to lawn weeds before or after emergence After weeding.

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 as follows:

Acetolactate synthase (ALS) inhibitors. 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 Chinese cabbage, Viola, corn grass, sorrel leaf Polygonum, sheep's trotters, brocade, plantain, mugwort, yellow flowers, green amaranth, shepherd's purse, chickweed, etc., have control effects on brevifolia, crabgrass and Cyperus radix Excellent.

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 herbicide officially registered on warm-season lawns (zoysia and bermudagrass) in my country. 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.

Halosulfuron-methyl is a sulfonylurea herbicide developed by Nissan Chemical Company and developed by Monsanto Company, chemical name: 3-chloro-5-(4,6-dimethoxypyrimidine-2 -Aminocarbonylaminosulfonyl)-1-methylpyrazole-4-carboxylic acid methyl ester. Its structural diagram is as follows:

Clopyrazosulfuron-methyl is a sulfonylurea herbicide and an inhibitor of acetolactate synthase. It is absorbed through the roots and leaves of weeds and conducted in plants. The weeds stop growing and then die. Clopyrazosulfuron-methyl is safe to wheat, corn, rice, sugarcane, lawn, etc. It is mainly used to control broad-leaved weeds and sedge weeds, such as velvetleum, barley, mandala, ragweed, amaranthus, Wild watermelon seedlings, Polygonum, Purslane, Solanum nigrum, Cassia, Morning Glory, Cyperus rotundum, etc.

At present, lawn herbicides are limited by safety and herbicidal spectrum is also limited. Using a single herbicide alone cannot completely and effectively control the occurrence of weeds in paddy fields. Moreover, some herbicides have high water solubility or field persistence Too long, excessive dosage or uneven application will easily cause residual toxicity to current crops or subsequent crops. Therefore, the present invention selects two kinds of herbicides, sulfasulfuron-methyl and chlorpyrazosulfuron-methyl, which have complementary advantages and disadvantages, to be used as a mixture after appropriate reduction, which not only reduces the consumption of medicaments, obviously improves the weeding effect, but also avoids damage to the herbicides. Possibility of phytotoxicity and residual poisoning on lawns.

Contents of the invention

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

Another object of the present invention is to provide the application of the herbicide in pre-emergence and post-emergence weeding of lawns.

A mixed herbicide containing rimsulfuron-methyl and closulfuron-methyl, characterized in that the herbicide uses rimsulfuron-methyl and chlorpyrazosulfuron-methyl as the main active ingredients, and rimsulfuron-methyl and chlorpyrazosulfuron-methyl The mass ratio is 1-80:1-80. Preferably, the mass ratio of rimsulfuron-methyl to clopyrasulfuron-methyl is 1-10: 1-10, more preferably the mass ratio of rimsulfuron-methyl to clopyrasulfuron-methyl is 1: 1-10, most preferably rimsulfuron-methyl The mass ratio of sulfuron-methyl to clopyrazosulfuron is 1:6-9.

In the mixed herbicide, the mass percent content of both pyrazosulfuron-methyl and chlorpyrazosulfuron-methyl in the herbicide is 1-85%, preferably 10-45% by mass.

In the binary compound preparation of pyrazosulfuron-methyl and clopyrazosulfuron-methyl of the present invention, in addition to the active ingredients such as pyrasulfuron-methyl and clopyrazosulfuron-methyl, conventional surfactants allowed on pesticide preparations, Additives such as thickeners, solvents or solid fillers are formulated into any dosage form allowed on pesticides. It is preferably processed into water-dispersible granules, wettable powders and the like.

The mixed herbicide of the present invention can be used in pre-emergence or post-emergence weeding of lawn weeds, especially in controlling various grasses, sedges and broad-leaved weeds in lawn, and has remarkable effect.

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

1. High herbicidal activity. Both pyrazosulfuron-methyl and clopyrazosulfuron-methyl 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). That is to say, the herbicide composition of the present invention can greatly improve the herbicidal activity of the herbicide under the premise of reducing the dosage.

2. Broad herbicide spectrum and long duration. Both sulfasulfuron-methyl and chlorpyrazosulfuron-methyl are sulfonylurea herbicides. After the two are mixed, their effects are complementary and the weeding spectrum is wider. Since sulfasulfuron-methyl is mainly effective against annual broad-leaved and grass weeds, It can also control perennial broadleaf weeds and sedge weeds, both soil and foliar applications can be used. Clopyrazosulfuron-methyl is mainly used to control broad-leaved weeds and sedge weeds, and can be used both before and after emergence. 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 a large amount of use of sulfonylurea herbicide weeds is easy to produce resistance, the herbicide of the present invention contains two kinds of sulfonylurea herbicides, which reduces the dosage of the medicament, delays the generation of weed resistance, and prolongs the The lifespan of the medicine.

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

Example 1

1% pyrazosulfuron-methyl, 9% chlorpyrazosulfuron-methyl, 4% alkylphenol polyoxyethylene ether, 5% polyoxyethylene polyoxypropylene block compound, 2% thickener, vegetable oil to 100%, according to The conventional preparation method is formulated into water-dispersible granules with a mass percent content of 10%.

Example 2

2% pyrazosulfuron-methyl, 18% chlorpyrazosulfuron-methyl, 9% NNO (sodium methylene bis-tetrasulfonate), 5% alkylphenol polyoxyethylene ether, 100% sodium lignosulfonate, according to the routine The formulation method is formulated into water-dispersible granules with a mass percentage of 20%.

Example 3

5% pyrazosulfuron-methyl, 30% chlorpyrazosulfuron-methyl, 7% sodium lignosulfonate, 5% sodium dodecylbenzenesulfonate, 5% ammonium sulfate, 100% diatomaceous earth, according to the conventional preparation Methods The wettable powder with a mass percentage of 35% was prepared.

Example 4

10% pyrazosulfuron-methyl, 60% chlorpyrazosulfuron-methyl, 6% NNO (sodium methylene bis-sulfonate), 5% sodium lignosulfonate, 9% white carbon black, 100% kaolin, according to the routine The preparation method is formulated into a wettable powder with a mass percentage of 70%.

Example 5

70% pyrazosulfuron-methyl, 1% chlorpyrazosulfuron-methyl, 6% NNO (sodium methylene bis-sulfonate), 4% sodium lignosulfonate, 9% white carbon black, 100% kaolin, according to the routine The preparation method is mixed with the water dispersible granule that mass percentage composition is 71%.

Example 6

20% pyrazosulfuron-methyl, 30% chlorpyrazosulfuron-methyl, 9% NNO (sodium methylene bis-tetrasulfonate), 5% alkylphenol polyoxyethylene ether, 100% sodium lignosulfonate, according to the routine The preparation method is formulated into a wettable powder with a mass percentage of 50%.

Example 7

1) Indoor activity determination test

Utilize the preparation in Examples 1-4, measure its co-toxicity coefficient to common lawn weed Cyperus rotundum.

Test method: sow the quantitative seeds of Cyperus cyperi in 9cm disposable paper cups, sow 10-15 seeds in each cup, and cultivate them in the light incubator. Spray treatments on crop sprays. 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 two effective substances have a synergistic effect, and a co-toxicity coefficient of less than 120 indicates that the two effective substances have an antagonistic effect. The measurement results are shown in Table 1.

Table 1 Indoor activity measurement results

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

2) Field drug efficacy test

Drugs for testing:

4 kinds of binary compound herbicides in Examples 1-4.

Comparative drug:

25% pyrazosulfuron-methyl water-dispersible granules (commercially available), 25% clopyrazosulfuron-methyl wettable powder (commercially available).

For the test lawn: Bermudagrass

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

Prevention object:

Dirtygrass, barnyardgrass, goosegrass, bluegrass, sedge, foxtail, Cyperus cyperi, chickweed, Kochia, sedge, Baogai grass, broken rice sedge, special-shaped sedge 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 production of bermudagrass should be observed within 1 to 15 days after the application to investigate whether the agent has phytotoxicity on the lawn.

The herbicidal test effect of the embodiment preparation of the present invention is shown in the following table 2 (20d after the medicine) and table 3 (40d after the medicine)

Table 2 Results of Field Drug Efficacy Test (20 days after drug treatment)

Table 3 Results of Field Drug Efficacy Test (40 days after medication)

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

Table 4 medicament to the safety investigation result of lawn

The bermudagrass in each treatment plot grew well, and no drug spots were seen, which indicated that all kinds of medicines were safe to bermudagrass.

Claims (10)

1., containing a mixed herbicide for flazasulfuron and halosulfuronmethyl, it is characterized in that this weed killer herbicide with flazasulfuron and halosulfuronmethyl for principle active component, the mass ratio of flazasulfuron and halosulfuronmethyl is 1 ~ 80:1 ~ 80.

2. the mixed herbicide containing flazasulfuron and halosulfuronmethyl according to claim 1, is characterized in that the mass ratio of flazasulfuron and halosulfuronmethyl in this weed killer herbicide is 1 ~ 10:1 ~ 10.

3. the mixed herbicide containing flazasulfuron and halosulfuronmethyl according to claim 1, is characterized in that the mass ratio of flazasulfuron and halosulfuronmethyl in this weed killer herbicide is 1:1 ~ 10.

4. the mixed herbicide containing flazasulfuron and halosulfuronmethyl according to claim 1, is characterized in that the mass ratio of flazasulfuron and halosulfuronmethyl in this weed killer herbicide is 1:6 ~ 9.

5., according to the mixed herbicide described in claim 1,2,3 or 4, it is characterized in that both flazasulfuron and the halosulfuronmethyl mass percentage in weed killer herbicide is 1 ~ 85%.

6., according to the mixed herbicide described in claim 5, it is characterized in that both flazasulfuron and the halosulfuronmethyl mass percentage in weed killer herbicide is 10 ~ 45%.

7., according to the mixed herbicide described in claim 1, it is characterized in that it with flazasulfuron and halosulfuronmethyl for the auxiliary agent that principle active component and agricultural chemicals allow is mixed with any one formulation.

8., according to the mixed herbicide described in claim 7, it is characterized in that described formulation is water dispersion granule, wetting powder.

9. the application of mixed herbicide before turf weed seedling or in postemergence weed control described in claim 1,2,3 or 4.

10. the application of mixed herbicide in Weeds in Turf in various grass family, sedge family and broad leaved weed described in claim 1,2,3 or 4.