CN111919849A

CN111919849A - Weeding composition containing halauxifen-methyl and pyribenzoxim and application thereof

Info

Publication number: CN111919849A
Application number: CN202010892764.1A
Authority: CN
Inventors: 赵月超; 葛家成; 李建; 孙名帅; 熊风
Original assignee: Qingdao Hengning Biotechnology Co ltd
Current assignee: Qingdao Hengning Biotechnology Co ltd
Priority date: 2020-08-29
Filing date: 2020-08-29
Publication date: 2020-11-13

Abstract

The invention discloses a weeding composition containing fluroxypyr ester and pyribenzoxim and application thereof. The weight ratio of the active ingredient A to the active ingredient B of the weeding composition is 1: 50-50: 1. The weeding composition provided by the invention combines and compounds two active ingredients with different action mechanisms of the fluroxypyr-meptyl and the pyribenzoxim, so that the components have obvious synergistic interaction, the weed control effect is improved, the dosage is reduced, the cost is saved, the generation of weed resistance can be delayed, and the environmental pollution is reduced.

Description

Weeding composition containing halauxifen-methyl and pyribenzoxim and application thereof

Technical Field

The invention belongs to the technical field of pesticide compounding, and particularly relates to a weeding composition containing halauxifen-methyl and pyribenzoxim, which is extended to the application of the weeding composition to the growing places and/or leaves and/or stems of unwanted plants, in particular to the application to the prevention and control of weeds in paddy fields.

Background

The chlorofluoropyridine (florpyrauxifen-benzyl) is a novel aryl picolinic acid herbicide developed by the American Riveronzen company, and can be applied to direct seeding fields, transplanting fields and other crop fields of rice. The product has a wide herbicidal spectrum, and can effectively prevent and kill main gramineous weeds, broadleaf weeds and cyperaceae weeds in the paddy field. CAS registry number 1390661-72-9.

Pyribenzoxim (pyribenzoxim) is a broad spectrum selective post-emergent herbicide of the pyrimidine salicylic acids. The action mechanism is similar to sulfonylurea and imidazolylketonic herbicides, and both belong to acetolactate synthase (ALS) inhibitors. Can be used for preventing and removing gramineous weeds and broadleaf weeds in fields of rice, wheat and the like. The pyribenzoxim is an optically active herbicide and can only play a role in light. After being absorbed by plant stems and leaves, the active ingredients are transmitted to tender tissues and roots in vivo to influence the activity of ALS, inhibit the synthesis of branched chain amino acid of plants, stop the growth of buds and roots, lead the tender tissues such as new leaves to yellow, and then lead the whole weed to die. CAS number 168088-61-7.

The weeds in the rice field are one of the main factors for restricting the high, stable and excellent yield of the rice. When the same kind of pesticide is applied to the paddy field for a long time, the crops are easy to generate drug resistance. Once the drug resistance is generated, the recommended dosage can not effectively prevent and control the target, and the application dosage is continuously increased, so that the drug resistance of the weeds can be enhanced and fall into the vicious circle of the drug resistance. And the herbicide with a single active ingredient has a limited weed control spectrum and cannot effectively control the occurrence of weeds.

The reasonable compounding of the herbicide is an effective method for improving the preventing and killing effect, expanding the weed control spectrum, delaying the drug resistance of weeds, reducing the environmental pollution, reducing the use cost and reducing the herbicide residue. The applicant unexpectedly finds that the blending of the fluroxypyr-meptyl and the pyribenzoxim with different action mechanisms has obvious synergistic control effect on various broad-leaved weeds such as snakehead intestines, monochoria vaginalis and edible tulip, gramineous weeds such as barnyard grass and Leersia graminifolia, and cyperaceae weeds such as special-shaped cyperus and cyperus, the dosage is reduced, the control cost is reduced, and the safety of crops is improved.

Disclosure of Invention

The invention aims to provide a weeding composition containing the fluroxypyr ester and the pyribenzoxim, which has the advantages of reasonable components, low medication cost, obvious synergistic effect, good weeding effect, wide weeding spectrum and safety to crops.

Another object of the invention is to provide a formulation of a herbicidal composition containing a chlorofluoropyridine ester and pyribenzoxim.

It is still another object of the present invention to provide the use of the above composition for controlling gramineous and broadleaf weeds in paddy fields.

The technical scheme of the invention is as follows:

a weeding composition containing fluroxypyr-meptyl and pyribenzoxim comprises an active ingredient A and an active ingredient B, wherein the active ingredient A is the fluroxypyr-meptyl, and the active ingredient B is the pyribenzoxim.

Further, the mass ratio of the fluroxypyr-meptyl to the pyribenzoxim is 1: 50-50: 1;

further, the mass ratio of the fluroxypyr-meptyl to the pyribenzoxim is 1: 20-20: 1;

further, the mass ratio of the fluroxypyr-meptyl to the pyribenzoxim is 1: 5-5: 1;

further, the active ingredient A and the active ingredient B account for 10-90% of the weeding composition by mass; preferably, the mass percent is 20-50%;

further, the weeding composition also comprises an auxiliary agent, wherein the auxiliary agent comprises one or more of a solvent, a dispersing agent, a wetting agent, a disintegrating agent, an emulsifying agent, a thickening agent, a stabilizing agent, an antifreezing agent, a carrier and the like;

further, the herbicidal composition can be prepared into various suitable dosage forms suitable for agricultural use; preferably, the preparation formulation is missible oil, suspending agent, wettable powder, water dispersible granule and dispersible oil suspending agent.

Emulsifiable Concentrate (EC) is a homogeneous, transparent, oily liquid consisting of the technical drug, organic solvent, emulsifier and other adjuvants, which is diluted into water to form a stable emulsion when used. The emulsifiable solution has the advantages of simple processing process, low equipment cost, easily grasped preparation technology, high content of effective components, good storage stability and high drug effect. Common organic solvents such as aromatic hydrocarbon compounds such as xylene, toluene, benzene, etc.; the commonly used compound emulsifier is a mixed emulsifier of a nonionic emulsifier and anionic sodium dodecyl benzene sulfonate and the like.

Suspension Concentrates (SC) water-insoluble solid bulk drugs are wet-milled with wetting agents, dispersants, thickeners, antifreeze and other adjuvants and water to form highly dispersed viscous, flowable suspension liquid formulations in water. The suspending agent takes water as a dispersing medium, and has low cost and good environmental compatibility. The dispersing agent and the wetting agent can quickly wet solid components before grinding so as to facilitate grinding, prevent mutual agglomeration of finely ground solid particles in a solid-liquid dispersion system, keep the effective components uniformly dispersed in a liquid phase for a long time and ensure the physical stability of a diluent during storage and use of the preparation. Dispersants such as polycarboxylates, lignosulfonates, alkylnaphthalenesulfonates, and the like; wetting agents such as alkylphenol polyoxyethylene ether formaldehyde condensate sulfate, alkylphenol polyoxyethylene ether phosphate, phenethylphenol polyoxyethylene ether phosphate, alkyl sulfate, alkylsulfonate, naphthalenesulfonate and the like; thickening agents such as high molecular compound xanthan gum, carboxymethyl cellulose, sodium polyacrylate, bentonite, magnesium aluminum silicate, etc.; the antifreezing agent mainly reduces damage of low temperature to physical stability of the preparation, and ethylene glycol, propylene glycol, glycerol, urea and the like are commonly used.

Wettable Powder (WP) is a powdery preparation containing original medicine, filler or carrier, wetting agent, dispersant and other auxiliaries, and is prepared into a certain fineness by mixing and crushing processes. The filler or carrier generally requires large adsorption capacity, small bulk density, inertness and low cost, such as kaolin, diatomite, bentonite, attapulgite, argil, white carbon black and the like; wetting agents such as alkyl sulfates, alkyl sulfonates, alkyl naphthalene sulfonates, and the like; the dispersant is selected from anionic surfactant such as lignin and its derivative sulfonate, naphthalene or alkyl naphthalene formaldehyde condensate sulfonate, etc., nonionic surfactant such as polyoxyethylene polyoxypropylene ether block copolymer, alkylphenol polyoxyethylene ether phosphate, etc., and water soluble polymer such as carboxymethyl cellulose, polyvinyl alcohol, etc.

The water dispersible granule (WG) consists of a technical material, a wetting agent, a dispersing agent, a stabilizing agent, a binding agent, a filler or a carrier. One or more of common dispersants such as polycarboxylate, lignosulfonate, alkylnaphthalene sulfonate, etc.; wetting agents such as alkyl sulfates, alkyl sulfonates, naphthalene sulfonates, and the like; disintegrating agents such as ammonium sulfate, sodium sulfate, polyvinylpyrrolidone, starch or its derivative, bentonite, etc.; binders such as starch, glucose, polyvinyl alcohol, polyethylene glycol, sodium carboxymethylcellulose, sucrose, etc.; the filler is selected from diatomite, kaolin, white carbon black, light calcium carbonate, talcum powder, attapulgite, pottery clay, etc.

Dispersible oil suspensions (OD) are composed of a base drug, a dispersant, an emulsifier, a wetting agent, a thickener, a dispersion medium, and the like. Dispersants such as polycarboxylates, lignosulfonates, alkylnaphthalenesulfonates, and the like; emulsifier castor oil polyoxyethylene ether, alkylphenol formaldehyde resin polyoxyethylene ether, sorbitan monostearate polyoxyethylene ether, phenethyl phenol polyoxyethylene polyoxypropylene ether and the like; wetting agents such as alkylphenol polyoxyethylene ether formaldehyde condensate sulfate, alkylphenol polyoxyethylene ether phosphate, phenethylphenol polyoxyethylene ether phosphate, alkyl sulfate, alkylsulfonate, naphthalenesulfonate and the like; thickening agents such as white carbon black, polyvinyl alcohol, bentonite, magnesium aluminum silicate, etc.; antifreezes such as ethylene glycol, propylene glycol, glycerin, urea, sodium chloride, and the like; dispersing medium such as soybean oil, rapeseed oil, wheat oil, methyl oleate, diesel oil, engine oil, mineral oil, etc.

The pesticide adjuvant may be classified into a surface active adjuvant and a non-surface active adjuvant according to whether or not it has surface activity. Most of the dispersing agent, wetting agent, disintegrating agent, emulsifying agent and thickening agent are surface active agents, the types and varieties are more, the solvent, stabilizing agent, antifreezing agent, carrier or filler belong to the latter, the varieties are less, and the choice is small;

further, the composition is missible oil, and the missible oil preferably comprises the following components in percentage by weight: active component A1-50%, active component B1-50%, solvent 10-80%, and emulsifier 1-20%;

further, the composition is a suspending agent, and the suspending agent preferably comprises the following components in percentage by weight: 1-50% of active ingredient A, 1-50% of active ingredient B, 1-20% of dispersant, 1-10% of wetting agent, 1-10% of thickening agent, 0.1-20% of antifreeze and the balance of deionized water;

further, the composition is a wettable powder, and the wettable powder preferably comprises the following components in percentage by weight: 1-50% of active ingredient A, 1-50% of active ingredient B, 1-20% of dispersing agent, 0.1-15% of wetting agent and the balance of filler or carrier;

further, the composition is a water dispersible granule, and the water dispersible granule preferably comprises the following components in percentage by weight: 1-50% of active ingredient A, 1-50% of active ingredient B, 1-15% of dispersing agent, 1-10% of wetting agent, 1-10% of binder and the balance of filler or carrier;

further, the composition is a dispersible oil suspending agent, and the dispersible oil suspending agent preferably comprises the following components in percentage by weight: active component A1-50%, active component B1-50%, dispersant 0.1-15%, emulsifier 0.5-20%, wetting agent 1-10%, thickener 1-10%, antifreezing agent 0-10%, and dispersing matrix 10-50%.

The invention provides a weeding composition containing halauxifen-methyl and pyribenzoxim; the above herbicidal compositions may be formulated into pesticidally acceptable formulations according to methods well known to those skilled in the art, and the herbicidal compositions and their formulations are useful for application to the locus and/or foliage and/or stems of unwanted plants;

further, the application of the weeding composition and the preparation thereof on the growing site and/or leaves and/or stems of unwanted plants is characterized in that the unwanted plants are paddy field weeds;

further, the weeding composition and the preparation thereof are applied to control paddy field weeds, and are characterized in that the paddy field weeds are paddy field gramineous weeds and/or broadleaf weeds and/or sedge weeds;

preferably, the gramineous weeds in the paddy field are one or more of barnyard grass, moleplant seed and Leersia graminis; the broad-leaved weeds in the paddy field are one or more of snakehead intestines, monochoria vaginalis and edible tulip; the Cyperaceae weed is selected from Cyperus rotundus L and Cyperus rotundus L.

The invention has the beneficial effects that:

the weeding composition has reasonable components, good weeding effect and low medication cost, and the activity and the weeding effect of the weeding composition are not simple superposition of the activities of the components, but have obvious synergistic action, can expand the weed control spectrum, delay resistance, have good safety to crops, and meet the safety requirement of pesticide preparations. The weeding composition has good control effect on gramineous weeds, broadleaf weeds and cyperaceae weeds in paddy fields.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more concise and clear, the present invention is described with the following specific embodiments, but the present invention is by no means limited to these embodiments. The following described examples are only preferred embodiments of the present invention, which can be used to describe the present invention and should not be construed as limiting the scope of the present invention. It should be understood that any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Preparation examples of formulations

In order to better illustrate the invention, the following examples are given to further illustrate the invention.

Example 1: 13% Chlorofluoropyridyl ester pyribenzoxim emulsifiable concentrate (3:10)

The formula is as follows: 3% of fluroxypyridine ester, 10% of pyribenzoxim, 30% of dimethyl sulfoxide, 5% of fatty alcohol-polyoxyethylene ether, 9% of alkylphenol polyoxyethylene polyoxypropylene ether, 1% of calcium dodecyl benzene sulfonate and 42% of methyl oleate;

the preparation method comprises the following steps: adding effective components of the fluroxypyr-meptyl and the pyribenzoxim into a carrier according to the proportion of the formula of the embodiment, adding a surfactant and other functional auxiliaries, and uniformly stirring and mixing in a stirring and mixing kettle to obtain the emulsifiable concentrate.

Example 2: 16% Chlorofluoropyridyl ester pyribenzoxim suspension (3:5)

The formula is as follows: 6% of fluroxypyridine ester, 10% of pyribenzoxim, 2% of sodium alkyl sulfate, 3% of alkylphenol formaldehyde resin polyoxyethylene ether, 0.5% of carboxymethyl cellulose, 5% of urea, 0.1% of propylene glycol and 73.4% of deionized water;

the preparation method comprises the following steps: according to the formula proportion, the effective components of the fluroxypyr meptyl, the pyribenzoxim, the surfactant and other functional additives are sequentially placed in a reaction kettle, water is added for uniform mixing, and the suspending agent is obtained through high-speed shearing, wet sanding and finally homogeneous filtration.

Example 3: 12% Chlorofluoropyridyl ester pyribenzoxim suspension (1:5)

The formula is as follows: 2% of fluroxypyridine ester, 10% of pyribenzoxim, 8% of dodecyl polyoxyethylene ether phosphate, 2% of sodium alkyl polyoxyethylene ether sulfonate, 0.4% of xanthan gum, 0.1% of carboxymethyl cellulose, 4% of sorbitol, 0.5% of glycerol and 73% of deionized water;

the preparation method comprises the following steps: the same as in example 2.

Example 4: 30% wettable powder of fluroxypyr meptyl (1:2)

The formula is as follows: 10% of fluroxypyridine ester, 20% of pyribenzoxim, 5% of calcium alkyl naphthalene formaldehyde condensate sulfonate, 6% of sodium alkyl phenol polyoxyethylene ether sulfonate, 3% of sodium alkyl naphthalene sulfonate, 5% of attapulgite and 51% of diatomite;

the preparation method comprises the following steps: according to the formula proportion of the embodiment, the effective components of the fluroxypyr-meptyl and the pyribenzoxim are added into a carrier, and a surfactant and other functional auxiliaries are added into the carrier, mixed, subjected to airflow crushing and then mixed to prepare the wettable powder.

Example 5: 4% Chlorofluoropyridinate pyribenzoxim water dispersible granule (1:1)

The formula is as follows: 2% of fluroxypyridine ester, 2% of pyribenzoxim, 7% of lignosulfonate, 4% of sodium dodecyl sulfate, 1% of sodium alkyl sulfonate, 2% of cane sugar, 2% of white carbon black and 80% of argil;

the preparation method comprises the following steps: according to the formula proportion of the embodiment, the effective components of the fluroxypyr-meptyl and the pyribenzoxim are added into a carrier, a surfactant and other functional auxiliaries are added into the carrier, the carrier and the surfactant are mixed, the mixture is subjected to airflow crushing, 10-25% of water is added, and then the water dispersible granules are prepared through kneading, granulating, drying and screening.

Example 6: 32% Chlorofluoropyridyl ester pyribenzoxim dispersible oil suspending agent (1:15)

The formula is as follows: 12% of fluroxypyridine ester, 20% of pyribenzoxim, 2% of sodium polycarboxylate, 4% of alkylphenol formaldehyde resin polyoxyethylene ether, 3% of phenethylphenol polyoxyethylene polyoxypropylene ether, 4% of sorbitan monostearate, 1% of sodium alkyl sulfate, 1% of bentonite, 5% of ethylene glycol and 48% of soybean oil;

the preparation method comprises the following steps: according to the formula proportion, the effective components of the fluroxypyr meptyl, the pyribenzoxim, the surfactant and other functional additives are sequentially placed in a reaction kettle, added with oil and uniformly mixed, subjected to high-speed shearing, wet sanding and finally homogeneous filtration to obtain the product.

Example 7: 25% Chlorofluoropyridinate pyribenzoxim dispersible oil suspending agent (1:4)

The formula is as follows: 5% of fluroxypyridine ester, 20% of pyribenzoxim, 2% of sodium lignosulfonate, 4% of phenethylphenol polyoxyethylene polyoxypropylene ether, 3% of sorbitan monostearate, 4% of alkylphenol polyoxyethylene ether phosphate, 4% of sodium naphthalenesulfonate, 1% of magnesium aluminum silicate, 4% of glycerol and 53% of rapeseed oil;

the preparation method comprises the following steps: the same as in example 6.

In order to determine the control effect of the blending of the fluroxypyr-meptyl and the pyribenzoxim on weeds in a paddy field, the optimal using dose and the safety of the fluroxypyr-meptyl to paddy rice, the following indoor activity test and field pesticide effect test are carried out.

Indoor activity test

Example 8: the test basis is as follows: NY/T1155.9-2008 "indoor bioassay of pesticides test criteria herbicides part 9: stem and leaf spraying method for testing activity of herbicide in paddy field.

Test targets: barnyard grass, Leersia hexandra Swartz, Cyperus rotundus L, Monochoria tonkinensis and edible tulip.

Reagent to be tested: 91.4% of a raw chlorofluoropyridine ester drug and 98% of a raw pyribenzoxim drug were provided by the research and development center of the Heliel pharmaceutical industry group, Inc.

Preparation of the medicament: dissolving the raw materials with dimethylformamide, diluting with 0.1% Tween 80 water solution, and preparing into 5 series of mass concentrations according to an equal ratio method for use.

The test method comprises the following steps: respectively sowing quantitative grass seeds in pots with the diameter of 9cm, culturing in a light incubator, and performing spray treatment on 20 plants per pot when weeds grow to the 1-3 leaf stage. The cultivation is continued in the greenhouse after the treatment, the weed control effect of each treatment is regularly observed, and the fresh weight of each treated weed is recorded after 14 days.

And (3) test treatment: repeat for 4 times in each treatment setting, and set clear water as a control.

Data investigation: the fresh weight control effect of each treatment was calculated 14 days after the spray treatment.

The calculation formula is as follows:

fresh weight control effect E ═ fresh weight of control area-fresh weight of treatment area x 100/fresh weight of control area

Mixed theory preventing effect E₀Weed control when the amount of herbicide a was P + weed control when the amount of herbicide B was Q-weed control when the amount of herbicide a was P x weed control when the amount of herbicide B was Q/100

The combined action evaluation standard of the mixed medicament is as follows:

E-E₀more than 10% is synergistic effect, E-E₀10% below is antagonistic, E-E₀An addition of. + -. 10% is obtained.

The test results are shown in the following tables:

TABLE 1 Combined action of Chlorofluoropyridyl ester with pyribenzoxim on barnyard grass, Leersia graminis

TABLE 2 Combined action of Chlorpyrifos-ester and pyribenzoxim on Pseudobulbus Cremastrae seu pleiones and herba Hedyotidis Diffusae

TABLE 3 Combined action of Chlorofluoropyridyl ester and pyribenzoxim on cyperus heterophyllus

According to the indoor activity, the blending of the fluroxypyr-meptyl and the pyribenzoxim has good indoor activity on common weeds (barnyard grass, Leersia graminis, Pseudobulbus cremastrae seu pleiones, monochoria vaginalis and sedge heterotrops) in the paddy field. The results in Table 1 show that the mixing ratio of the fluroxypyr-meptyl to the pyribenzoxim is 8+25(1:3.13), 8+35(1:4.38), 12+15(2:1.25), 12+25(1:2.08), 12+35(1:2.92), 16+25 (1: 1.56) and 16+35(1:2.19), the fresh weight inhibition rates of the cloaca are respectively 53.9%, 62.4%, 55.9%, 68.5%, 60.1% and 72.2%, and the effect is synergistic effect; 8+35(1:4.38), 12+35(1:2.92), 6+25 (1: 1.56) and 16+35(1:2.19) show synergistic effect on the rice leersia hexandra. Table 2 the combined action of fluroxypyr-meptyl and pyribenzoxim on arrowhead and monochoria vaginalis showed that 12+25(1:2.08), 12+35(1:2.92), 16+15(1.07:1) and 16+25 (1: 1.56) showed synergistic effect on broadleaf weeds arrowhead and monochoria vaginalis. Table 3 shows that the combined action result of the blending of the fluroxypyr-meptyl and the pyribenzoxim on the sedge heterotype shows that the blending proportion of the fluroxypyr-meptyl and the pyribenzoxim shows additive or synergistic action on the sedge heterotype, wherein the synergy of 16+35(1:2.19) is most obvious, the fresh weight inhibition rate is 72.9 percent, and the E-E₀The content was 16.6%.

Test of field drug effect

Example 9: test of field efficacy of different treatments on paddy field weeds

The inventor conducts the test in 2018 in the Yangtze river of Heilongjiang, and the rice variety is No. 4 Fengliyou.

The test agents and dosages are shown in Table 4, and are in a randomized block design, with 3 replications per treatment, and a cell area of 20m². The control effect of each agent on weeds in paddy fields is measured by spraying stem leaves.

TABLE 4 different test Agents

	Test agent	Dosage (g/hm)²)
			Preparation 1	13% Chlorofluoropyridyl ester pyribenzoxim emulsifiable concentrate (3:10)	20
Preparation 2	16% Chlorofluoropyridyl ester pyribenzoxim suspension (3:5)	20
			Preparation 3	30% wettable powder of fluroxypyr meptyl (1:2)	20
Preparation 4	4% Chlorofluoropyridinate pyribenzoxim water dispersible granule (1:1)	20
			Preparation 5	25% Chlorofluoropyridinate pyribenzoxim dispersible oil suspending agent (1:4)	20
Control 1	10% pyribenzoxim suspension	30
			Control 2	3% chlorofluoropyridine ester emulsifiable concentrate	18

Using 5-point sampling method, each point is 0.25m²And (5) investigating the number of residual weed plants in the sample points 15d and 30d after the application of the herbicide, and calculating the control effect of the plants. And (5) surveying the fresh weight of the weeds in the sample points 30d after the application of the herbicide, and calculating the fresh weight control effect. The data were analyzed for differential significance using the IBM SPSS Statistics 2.0 Duncan new double-pole difference method. The calculation formula of the plant control effect and the fresh weight control effect is as follows:

plant control effect (%) - (number of weed plants in blank control area-number of weed plants in treated area)/number of weed plants in blank control area × 100

Fresh weight control effect (%) - (fresh weight of weeds in blank control area-fresh weight of weeds in treated area)/fresh weight of weeds in blank control area x 100

The safety of each agent on rice is observed by adopting a visual inspection method, whether the rice has symptoms of yellowing, growth inhibition and the like is observed 5 days after the application, and the plant height and tillering of the rice are observed 30 days after the application.

TABLE 5 controlling effect (%) on the number of weeds in paddy field with each agent-14 days after application

TABLE 6 control Effect (%) on the number of weeds in paddy fields by Each agent-30 days after application

TABLE 7 fresh weight control (%) of the respective agents for controlling weeds in paddy fields-30 days after application

The test results in tables 5 to 7 show that the test agents of the fluroxypyr meptyl and the pyribenzoxim have good control effects on barnyard grass, Leersia graminis, Arrowia indica, monochoria vaginalis and cyperus heterotropoides. 14d after the pesticide is applied, the investigation shows that the 25% of the fluroxypyr-meptyl-pyribenzoxim dispersible oil suspending agent (1:4) has the best control effect, the total weed control effect is 84.35%, the 13% of the fluroxypyr-meptyl-pyribenzoxim emulsifiable concentrate (3:10), the 16% of the fluroxypyr-meptyl-pyribenzoxim suspending agent (3:5) and the 4% of the fluroxypyr-meptyl-pyribenzoxim-meptyl-pyrim-meptyl-ether water dispersible granule (1:1) respectively have 78.52%, 79.64% and 80.29% of the total weed control effect, the three treatment control effects have no significant difference, and the treatment control effects of the compound pesticide are significantly higher than those of the control pesticide 10% of the pyribenzoxim-meptyl-ether suspending agent.

The control effect is improved after 30 days of application along with the increase of time, wherein the total weed control effect of 25 percent of the fluroxypyr-meptyl-pyribenzoxim dispersible oil suspending agent (1:4) and 30 percent of the fluroxypyr-meptyl-pyribenzoxim wettable powder (1:2) is 85.98 percent and 83.91 percent respectively, and the better control effect is shown.

According to the investigation of the fresh weight control effect of weeds 30 days after application, the control effect of each medicament is 93.24-96.17%, wherein the control effect of 25% of fluroxypyr-meptyl-pyribenzoxim dispersible oil suspending agent (1:4) is the best, the control effect is 96.43%, the control effect of 10% of pyribenzoxim suspending agent and the control effect of 3% of fluroxypyr-meptyl-emulsifiable concentrate are 88.38% and 85.29% respectively.

Safety investigation: and (4) observing during the test period, wherein all the test agents are safe to the growth of rice and have no phytotoxicity phenomenon.

In conclusion, the composition adopts a combined compounding scheme of the fluroxypyr-meptyl and the pyribenzoxim, the activity and the weeding effect are not simple superposition of the activities of all components, and compared with the existing single preparation, the composition has obvious control effect and obvious synergistic effect on plots where various gramineous weeds and broadleaf weeds are mixed, can delay resistance, has little pesticide residue and good safety, and meets the safety requirement of pesticide preparations.

Claims

1. The weeding composition containing the fluroxypyridine ester and the pyribenzoxim is characterized by comprising an active ingredient A and an active ingredient B, wherein the active ingredient A is the fluroxypyridine ester, and the active ingredient B is the pyribenzoxim.

2. The herbicidal composition according to claim 1, wherein the mass ratio of the fluroxypyr-meptyl to the pyribenzoxim is 1:50 to 50: 1.

3. The weeding composition according to claim 1, wherein the mass ratio of the fluroxypyr-meptyl to the pyribenzoxim is 1:20 to 20: 1.

4. The weeding composition according to claim 1, wherein the mass ratio of the fluroxypyr-meptyl to the pyribenzoxim is 1:5 to 5: 1.

5. The weeding composition according to any one of claims 1 to 4, wherein the active ingredient A and the active ingredient B account for 10 to 90 percent of the weeding composition; preferably, the mass percentage is 20 to 50 percent.

6. A herbicidal composition according to any of claims 1 to 5, characterized in that it further comprises adjuvants including one or more of solvents, dispersants, wetting agents, disintegrants, emulsifiers, thickeners, stabilizers, antifreezes, carriers and the like.

7. The herbicidal composition as claimed in any of the preceding claims, characterized in that it can be prepared in various suitable dosage forms suitable for agricultural use; preferably, the preparation formulation is missible oil, suspending agent, wettable powder, water dispersible granule and dispersible oil suspending agent.

8. Use of the herbicidal composition according to any one of claims 1 to 7 and formulations thereof for the growing locus and/or leaves and/or stems of unwanted plants.

9. The herbicidal composition and use of the formulation thereof as claimed in claim 8 for the growing of unwanted vegetation and/or on the foliage and/or stems of said unwanted vegetation, wherein said unwanted vegetation is a paddy field weed.

10. The herbicidal composition and use of the formulation thereof for controlling paddy field weeds as claimed in claim 9, wherein the paddy field weeds are paddy field grassy weeds and/or broadleaf weeds and/or sedge weeds;