CN102027907A - Herbicidal composition containing fluazifop-p-butyl and clethodim and application thereof - Google Patents

Abstract

The invention discloses a herbicidal composition containing fluazifop-p-butyl and clethodim and application thereof. The herbicidal composition takes fluazifop-p-butyl and clethodim as the main active ingredients, wherein the mass ratio of fluazifop-p-butyl to clethodim is (1-70):(1-80) and fluazifop-p-butyl and clethodim account for 5-85% of the herbicidal composition by mass. The herbicidal composition has obvious effect on preparing the herbicides for controlling the postemergence weeds in the soybean fields, especially the herbicides for controlling various grass weeds in the soybean fields. Compared with the single agent, the herbicidal composition delays weed resistance, has wide herbicidal spectrum and long efficacy duration and does no harm to the rapes and the aftercrops on the premise of improving the drug effect.

Description

A kind of herbicidal composition containing refined fluazifop and clethodim and its application

technical field

The invention belongs to the field of pesticides, and relates to a herbicidal composition, in particular to a herbicidal composition containing refined fluazifop-fop and clethodim clethodim and an application thereof.

technical background

Fluazifop-methyl, also known as Jingwenshade, chemical name: (R)-2-{4-[(5-trifluoromethyl)-2-yl-pyridyl]oxy}propionic acid butyl ester . It belongs to phenoxycarboxylic acid herbicides, is a fatty acid synthesis inhibitor, and is a new generation of fluorinated heterocyclic herbicides with high efficiency. Its structural formula is as follows:

Mainly used for the control of barnyardgrass, wild oats, foxtail, golden foxtail, goosegrass, mermaid, stephenia, teff, brome, barley, rye, millet, bluegrass, bermudagrass, double spikes Annual and perennial gramineous weeds such as paspalum, false sorghum, reed, wild silkworm, imperata, creeping wheatgrass, etc. It can be applied in the whole field or in the seedling belt. Weeds with small leaf age use low dosage, and large leaf age use high dosage; use low dosage when the water condition is good, and use high dosage under drought conditions. Moreover, its weeding effect is seriously affected by climate and rain, so its use is affected by local climate changes.

Clethodim, also known as Shouletong. Chemical name: (±)-2-[(E)-3-chloroallyloxyimino]propyl-5-[2-(ethylthio)propyl]-3-hydroxycyclohex-2-ene ketone. Cyclohexenone herbicides. The structural formula is:

The herbicide is a systemic conduction type stem and leaf treatment agent, has excellent selectivity, has a strong killing effect on grass weeds, and is safe to dicotyledonous crops. After the treatment of stems and leaves, it is quickly absorbed by the leaves and transmitted to the meristematic tissue. It works by inhibiting the biosynthesis of branched-chain fatty acids and flavonoids in sensitive plants, destroying cell division and inhibiting the activity of plant meristems. It can delay the growth of plants, chlorosis and necrosis of plants within 1-3 weeks after application, and then the leaves burn and dry up and die. It is effective for most annual and perennial grass weeds. It can be rapidly degraded in resistant plants, forming polar products, and rapidly loses its activity. It has little or no activity on dicotyledonous plants and sedges. However, it is ineffective against broad-leaved weeds, and some weeds have developed severe resistance to it due to long-term use of clethodim in soybean fields.

At present, herbicides in soybean fields are limited by the safety of crops, and the herbicidal spectrum is also limited. Using a single herbicide alone cannot completely effectively control the occurrence of weeds in soybean fields. Too long, excessive dosage or uneven application will easily cause residual toxicity to current crops or subsequent crops.

Contents of the invention

The object of the present invention is to provide a herbicidal composition containing fluazifop-fop and clethodim.

Another object of the present invention is to provide the application of the herbicide in the preparation of a herbicide for controlling weeds in soybean fields.

A herbicidal composition containing fluazifop-fop and clethodim, characterized in that the herbicidal composition uses fluazifop-fop and clethodim as the main active ingredients, and fluazifop-p-ethyl and clethodim The mass ratio of ketone is 1-70:1-80. Preferably, the mass ratio of fluazifop-ethyl to clethodim is 1-50:1-60.

In the herbicidal composition, the mass percent content of fluazifop-p-ethyl and clethodim in the herbicidal composition is 5-85%, preferably 10-75%.

In the binary compound preparation of fluazifop-fop and clethodim of the present invention, in addition to active ingredients such as fluazifop-fop and clethodim, conventional surfactants, Additives such as thickeners, solvents or solid fillers are formulated into any dosage form allowed on pesticides. It is preferably processed into emulsifiable concentrates, suspension concentrates, aqueous emulsions, microemulsions, water-dispersible granules, wettable powders, etc.

The herbicidal composition provided by the invention can be applied to the preparation of herbicides for controlling post-emergence weeds in soybean fields, especially for the preparation of herbicides for controlling various gramineous weeds in soybean fields, and has remarkable effects.

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

1. High herbicidal activity. The herbicidal composition of the present invention can kill weeds through two different mechanisms, so that the speed of weed resistance generation is reduced, and the herbicidal activity of the herbicide is greatly improved.

2. Broad herbicide spectrum and long duration. Fluazifop-p-ethyl is a broad-spectrum herbicide, which has a good control effect on annual grass weeds, and clethodim is a herbicide for controlling grass weeds. The combination of the two can improve the control of various annual grass weeds and perennial grass weeds.

3. Delay weed resistance. The herbicide of the present invention reduces the resistance of weeds to the chemical agent through binary compounding, and improves the control effect of resistant weeds, thereby prolonging the service life of the chemical agent.

4. High security. Due to the controlled dosage of the medicament, the safety of the medicament to fields such as soybeans, cotton, rapeseed and tobacco and subsequent crops has also been improved under the premise of improving the efficacy of the medicament.

High security. The herbicidal composition of the present invention is applied to post-emergence weeding in soybean fields, can prevent and control various grass weeds in soybean fields, and has high safety for soybeans and subsequent crops under the premise of improving the efficacy.

Detailed ways

Example 1

Refined fluazifop-methyl 8%, clethodim 32%, alkylphenol polyoxyethylene ether 4%, phenethylphenol polyoxyethylene ether 15%, xylene to 100%, prepared according to the conventional preparation method The percentage content is 40% emulsifiable concentrate.

Example 2

Fluazifop-ethyl 6%, clethodim 19%, sodium methylnaphthalenesulfonate formaldehyde condensate 6%, nonylphenol polyoxyethylene ether 3%, magnesium aluminum silicate 0.5%, ethylene glycol 7%, 2% of tributyl phosphate, 0.2% of silicone oil, and the balance of water are formulated into a suspending agent with a mass percentage of 25% according to a conventional preparation method.

Example 3

Fluazifop-ethyl 45%, clethodim 10%, NNO (sodium methylene bis-tetrasulfonate) 5%, ammonium sulfate 3%, polyvinyl alcohol 2%, kaolin to 100%, according to the conventional preparation method It is prepared as a water-dispersible granule with a mass percent content of 55%.

Example 4

15% of fluazifop-methyl, 60% of clethodim, 6% of NNO (sodium methylene bistethylate sulfonate), 4% of sodium iodate of wood, 100% of kaolin, prepared according to the conventional preparation method into 100% A wettable powder with a content of 75%.

Example 5

Fluazifop-ethyl 12%, clethodim 3%, sodium methylnaphthalene sulfonate formaldehyde condensate 6%, nonylphenol polyoxyethylene ether 3%, magnesium aluminum silicate 0.5%, ethylene glycol 7%, 2% of tributyl phosphate, 20% of mineral spirits, and 100% of water are formulated into a water emulsion with a mass percent content of 15% according to a conventional preparation method.

Example 6

Fluazifop-methyl 2%, clethodim 8%, sodium methylnaphthalene sulfonate formaldehyde condensate 6%, nonylphenol polyoxyethylene ether 3%, magnesium aluminum silicate 0.5%, ethylene glycol 7%, Tributyl phosphate 2%, water to 100%, according to the conventional preparation method, is prepared into a microemulsion with a mass percent content of 10%.

Example 7

1. Indoor activity test

Utilize the preparation of embodiment 1,2,3,4, measure its co-toxicity coefficient to barnyardgrass.

Test method: Quantitative barnyardgrass seeds were sown in 9cm disposable paper cups, 10-15 seeds were sown in each cup, and cultivated in a 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 100 indicates that the two effective substances have a synergistic effect, and a co-toxicity coefficient of less than 100 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 100, 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:

15% refined fluazifop-ethyl emulsifiable concentrate (commercially available), 240 g/L clethodim EC (commercially available).

Tested crops: soybean

The soybean seedlings are growing well, the plants are robust, and there are no other diseases and insect pests.

Prevention object:

Barnyardgrass, wild oats, foxtails, crabgrass, goosegrass, kanmai and other annual grass 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 the crops should be observed within 1 to 15 days after the application to investigate whether the pesticides have phytotoxicity on the crops.

The herbicidal test effect of the embodiment preparation of the present invention is shown in Table 2 (20d after the medicine) and Table 3 (40d after the medicine), and the safety investigation results of the medicament to the crops are shown in Table 4.

Table 2 field efficacy test results (20d after the medicine)

Table 3 field efficacy test results (40d after the medicine)

The amounts in Table 2 and Table 3 all refer to the amount of active ingredients in each preparation.

It can be seen from Table 2 and Table 3 that the herbicidal composition of the present invention has the effect of improving the control effect on grass weeds and prolonging the effective period.

Table 4 The results of the investigation of the safety of pesticides on crops

The soybeans in each treatment plot grew well without any drug spots, which indicated that all kinds of chemicals were safe to soybeans.

Claims (8)

1. a Herbicidal combinations that contains efficient fluazifop and clethodim is characterized in that this Herbicidal combinations is main active ingredient with efficient fluazifop and clethodim, and wherein the mass ratio of efficient fluazifop and clethodim is 1～70: 1～80.

2. the Herbicidal combinations that contains efficient fluazifop and clethodim according to claim 1 is characterized in that the mass ratio of efficient fluazifop and clethodim is 1～50: 1～60 in this Herbicidal combinations.

3. according to claim 1,2 described Herbicidal combinations, it is characterized in that efficient fluazifop and the clethodim gross mass percentage composition in Herbicidal combinations is 5～85%.

4. Herbicidal combinations according to claim 3 is characterized in that efficient fluazifop and the clethodim gross mass percentage composition in Herbicidal combinations is 10～75%.

5. Herbicidal combinations according to claim 1 is characterized in that the auxiliary agent that allows on efficient fluazifop and clethodim and the agricultural chemicals is mixed with any one formulation.

6. Herbicidal combinations according to claim 5 is characterized in that described formulation is missible oil, suspending agent, aqueous emulsion, emulsifiable concentrate, water dispersion granule, wetting powder.

7. the described Herbicidal combinations of claim 1 is prevented and kill off application in the weed killer herbicides of soybean Tian Miaohou weeds in preparation.

8. the described Herbicidal combinations of claim 1 is prevented and kill off application in the weed killer herbicides of the various grassy weeds of soybean Tanaka in preparation.