阅读说明：本技术 一种含禾草丹和氯氟吡啶酯的除草组合物 (Weeding composition containing thiobencarb and fluroxypyr meptyl ) 是由 袁国徽 沈国辉 田志慧 于 2021-09-29 设计创作，主要内容包括：本发明公开一种含有禾草丹和氯氟吡啶酯的除草组合物,该除草组合物有效成分包括禾草丹和氯氟吡啶酯,其余为辅料；其中所述禾草丹和所述氯氟吡啶酯的质量比为(25-150)：1,所述有效成分含量为所述除草组合物总质量的1-90％。所述辅料为农药中允许使用和接受的辅助成分,该除草组合物的剂型为乳油、可分散油悬浮剂、可湿性粉剂。能有效防除水稻田中禾本科杂草、阔叶杂草以及莎草科杂草,具有扩大杀草谱,增效作用明显,减少农药使用量、延缓杂草抗性、对作物安全等特点。(The invention discloses a weeding composition containing thiobencarb and fluroxypyr meptyl, wherein the effective components of the weeding composition comprise thiobencarb and fluroxypyr meptyl, and the balance is auxiliary materials; wherein the mass ratio of the thiobencarb to the fluroxypyridine ester is (25-150): 1, wherein the content of the effective components is 1-90% of the total mass of the weeding composition. The auxiliary materials are auxiliary components which are allowed to be used and accepted in the pesticide, and the dosage form of the weeding composition is missible oil, dispersible oil suspending agent and wettable powder. Can effectively prevent and kill off gramineous weeds, broad-leaved weeds and cyperaceae weeds in paddy fields, and has the characteristics of expanding a weed control spectrum, obvious synergistic effect, reducing the using amount of pesticides, delaying the resistance of weeds, being safe to crops and the like.)

1. A weeding composition containing prosulfocarb and fluroxypyr meptyl is characterized in that the effective components of the weeding composition comprise prosulfocarb and fluroxypyr meptyl, and the balance is auxiliary materials; wherein the mass ratio of the thiobencarb to the fluroxypyridine ester is (25-150): 1.

2. the herbicidal composition containing prosulfocarb and fluroxypyr esters as claimed in claim 1, wherein the active ingredient content is 1 to 90% of the total mass of the herbicidal composition.

3. The herbicidal composition containing prosulfocarb and fluroxypyr meptyl according to claim 1, wherein the formulation of the herbicidal composition comprises emulsifiable concentrates, dispersible oil suspensions, wettable powders.

4. A herbicidal composition containing prosulfocarb and fluroxypyr esters as claimed in claim 3, wherein when said herbicidal composition is in the form of emulsifiable concentrate, said adjuvants are: the emulsifier is selected from one or more of castor oil polyoxyethylene ether Emulsogen EL360, alkylphenol formaldehyde resin polyoxyethylene ether, sorbitan monostearate polyoxyethylene ether, and phenethyl phenol polyoxyethylene polyoxypropylene ether; the solvent is one or more selected from xylene, toluene, biodiesel, methyl esterified vegetable oil, and N-methyl pyrrolidone; the stabilizer is one or more selected from epichlorohydrin, epoxidized soybean oil and triphenyl phosphate.

5. A herbicidal composition containing prosulfocarb and fluroxypyr meptyl according to claim 3, wherein when the herbicidal composition is in the form of a dispersible oil suspension, the adjuvants are: the dispersant is selected from one or more of sodium lignosulfonate REAX82P, naphthalene sulfonate dispersant MORGET D425, alkyl naphthalene sulfonate dispersant TERSPERSE 2020, polycarboxylate dispersant TERSPERSE 2700; the emulsifier is selected from one or more of castor oil polyoxyethylene ether Emulsogen EL360, alkylphenol formaldehyde resin polyoxyethylene ether, sorbitan monostearate polyoxyethylene ether, and phenethyl phenol polyoxyethylene polyoxypropylene ether; the wetting agent is selected from one or more of fatty alcohol-polyoxyethylene ether sodium sulfate, isomeric tridecanol polyoxyethylene ether Genapol X080, alkyl sulfate and alkyl sulfonate; the thickener is one or more selected from xanthan gum, polyvinyl alcohol, bentonite and magnesium aluminum silicate; the antifreezing agent is one or more selected from ethylene glycol, propylene glycol and glycerol; the dispersion medium is selected from one or more of soybean oil, corn oil, rapeseed oil, mineral oil, ethyl acetate and methyl benzoate; the stabilizer is one or more selected from epichlorohydrin, epoxidized soybean oil and triphenyl phosphate.

6. The herbicidal composition containing the benthiavalicarb and the fluroxypyr meptyl according to claim 3, wherein when the formulation of the herbicidal composition is wettable powder, the auxiliary materials are: the dispersant is selected from one or more of sodium lignosulfonate REAX82P, naphthalene sulfonate dispersant MORGET D425, alkyl naphthalene sulfonate dispersant TERSPERSE 2020, polycarboxylate dispersant TERSPERSE 2700; the wetting agent is selected from one or more of fatty alcohol-polyoxyethylene ether sodium sulfate, isomeric tridecanol polyoxyethylene ether Genapol X080, alkyl sulfate and alkyl sulfonate; the filler is one or more selected from sucrose, ammonium sulfate, urea, glucose, kaolin, diatomite, bentonite, attapulgite, white carbon black, starch and light calcium carbonate.

7. Use of a herbicidal composition according to any one of claims 1 to 6 containing prosulfocarb and fluroxypyr meptyl for the control of weeds in paddy rice fields.

Technical Field

The invention belongs to the technical field of compound pesticides, and particularly relates to a weeding composition containing thiobencarb and fluroxypyr meptyl.

Background

Rice is one of the important grain crops in China and is an important foundation for guaranteeing grain safety. Weeds are an important factor affecting rice yield and quality. According to statistics, the rice yield loss caused by the weed harm in China is about 1000 ten thousand tons every year, the average loss rate is about 15%, and even the yield is reduced by more than 50% when the weed harm is serious. At present, chemical control is the most convenient and effective means for preventing and controlling weeds in paddy fields. However, the problem of weed drug resistance is increasingly prominent due to long-term use of single or similar herbicide varieties, and the herbicide poses serious threats to the improvement of the current rice production capacity, the ecological safety of rice fields and the quality safety of rice.

The single use of a herbicide in the paddy field cannot completely and effectively control the occurrence of weeds in the paddy field, and if the use amount is too large, residual toxicity is easily caused to current season crops or afterculture crops. The reasonable compounding or mixing of the herbicide is an effective method for improving the control effect, expanding the weed control spectrum, reducing the dosage, lightening the pollution to the environment, prolonging the application suitable period, delaying the generation and development of the drug resistance of weeds, reducing the use cost and reducing the herbicide residue.

Disclosure of Invention

In view of the above, the invention provides a weeding composition containing thiobencarb and fluroxypyr meptyl, which has the advantages of remarkable synergistic effect, good weeding effect, expanded weed control spectrum, low medication cost, capability of delaying weed resistance and safety to rice.

In order to achieve the purpose, the invention provides the following technical scheme:

a herbicidal composition containing prosulfocarb and fluroxypyr meptyl, the active ingredient of the herbicidal composition includes prosulfocarb and fluroxypyr meptyl, the other is supplementary product; wherein the mass ratio of the thiobencarb to the fluroxypyridine ester is (25-150): 1.

further, the content of the effective components is 1-90% of the total mass of the weeding composition. Preferably 51%.

Furthermore, the dosage form of the weeding composition comprises missible oil, dispersible oil suspending agent and wettable powder.

Further, when the formulation of the weeding composition is missible oil, the auxiliary materials are as follows: the emulsifier is selected from one or more of castor oil polyoxyethylene ether Emulsogen EL360, Nongru 700# (common name: alkylphenol formaldehyde resin polyoxyethylene ether), Tween 60# (common name: sorbitan monostearate polyoxyethylene ether), Nongru 1601# (common name: phenethylphenol polyoxyethylene polyoxypropylene ether); the solvent is one or more selected from xylene, toluene, biodiesel, methyl esterified vegetable oil, and N-methyl pyrrolidone; the stabilizer is one or more selected from epichlorohydrin, epoxidized soybean oil and triphenyl phosphate.

Further, when the dosage form of the weeding composition is a dispersible oil suspending agent, the auxiliary materials are as follows: the dispersant is selected from one or more of sodium lignosulfonate REAX82P, naphthalene sulfonate dispersant MORGET D425, alkyl naphthalene sulfonate dispersant TERSPERSE 2020, polycarboxylate dispersant TERSPERSE 2700; the emulsifier is selected from one or more of castor oil polyoxyethylene ether Emulsogen EL360, Nongru 700# (common name: alkylphenol formaldehyde resin polyoxyethylene ether), Tween 60# (common name: sorbitan monostearate polyoxyethylene ether), Nongru 1601# (common name: phenethylphenol polyoxyethylene polyoxypropylene ether); the wetting agent is selected from one or more of fatty alcohol-polyoxyethylene ether sodium sulfate, isomeric tridecanol polyoxyethylene ether Genapol X080, alkyl sulfate and alkyl sulfonate; the thickener is one or more selected from xanthan gum, polyvinyl alcohol, bentonite and magnesium aluminum silicate; the antifreezing agent is one or more selected from ethylene glycol, propylene glycol and glycerol; the dispersion medium is selected from one or more of soybean oil, corn oil, rapeseed oil, mineral oil, ethyl acetate and methyl benzoate; the stabilizer is one or more selected from epichlorohydrin, epoxidized soybean oil and triphenyl phosphate.

Further, when the dosage form of the weeding composition is wettable powder, the auxiliary materials are as follows: the dispersant is selected from one or more of sodium lignosulfonate REAX82P, naphthalene sulfonate dispersant MORGET D425, alkyl naphthalene sulfonate dispersant TERSPERSE 2020, polycarboxylate dispersant TERSPERSE 2700; the wetting agent is selected from one or more of fatty alcohol-polyoxyethylene ether sodium sulfate, isomeric tridecanol polyoxyethylene ether Genapol X080, alkyl sulfate and alkyl sulfonate; the filler is one or more selected from sucrose, ammonium sulfate, urea, glucose, kaolin, diatomite, bentonite, attapulgite, white carbon black, starch and light calcium carbonate.

The invention also provides application of the weeding composition containing the bentazone and the fluroxypyr-meptyl in preventing and controlling weeds in rice fields.

The action mechanism of the thiobencarb is to inhibit the activity of alpha-amylase, interfere the synthesis of protein, influence the mitosis of weed cells and the growth of growing points, and cause the death of germinated weed seeds and weeds in the early germination period. The agent is mainly used for paddy field, and can be used for preventing and treating barnyard grass, semen Euphorbiae, shaped Cyperus rotundus, felt of cattle, solar-day Fimbristylis, stranguria, mother grass, herba Monochoriae, and flos Potentillae Fucifoliae.

The chlorofluoropyridine ester is an aryl picolinate selective systemic conduction type herbicide, and the action mechanism of the chlorofluoropyridine ester is that the chlorofluoropyridine ester is combined with hormone receptors in weeds to interfere with normal physiological and biochemical functions of the weeds, so that the weeds die. The agent is mainly used for paddy field, and can be used for preventing and treating cockspur grass, semen Euphorbiae, shaped Cyperus rotundus, ground Cyperus rotundus, rhizoma Cyperi, Ribes nigrum, Abutilon, Alismatis rhizoma, herba Amaranthi Tricoloris, Amaranthus mangostachys, Ambrosia artemisii, Chenopodium album, herba Eugeniae Lobatae, Pseudobulbus Cremastrae Seu pleiones, and herba Xanthii.

The fluroxypyr meptyl has special effect on controlling broad-leaved weeds and cyperaceae weeds, but needs to use larger dosage for controlling gramineous weeds, and has higher control cost. Similarly, under the anaerobic condition, the gramineous can be degraded into dechlorinated gramineous by soil microorganisms, and certain influence is exerted on the growth of rice. I.e. both have certain disadvantages when used alone. The invention reasonably matches and combines the two components, and strictly controls each parameter and proportion, so that the composition of the two components realizes the effect that 1+1 is more than 2, and has synergistic effect.

The weeding composition provided by the invention has the following beneficial effects:

1. the weeding composition provided by the invention shows obvious synergistic effect in a certain proportioning range, the control effect of the composition is obviously improved compared with that of a single agent, the using dosage of pesticide can be reduced, the using times can be reduced, the using cost can be reduced, and the adverse effect of the pesticide on the ecological environment can be reduced;

2. The weeding composition provided by the invention has the advantages that the combination of two effective components expands the weeding spectrum, the problem of various weeds can be solved by using the composition once, and the defects and limitation of single-dose use are overcome;

3. the two effective components of the weeding composition provided by the invention have different action mechanisms, so that the defect that resistance is easy to generate after long-term single use can be overcome, the service life of the herbicide is prolonged, and the weeding composition has important significance for comprehensive treatment of weed resistance.

Detailed Description

Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.

It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The specification and examples are exemplary only.

As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.

For the preparation of missible oil, dispersible oil suspending agent, wettable powder and other dosage forms, the preparation can be prepared by using corresponding auxiliary agents according to the method known by the technical personnel in the field, and the details are not repeated.

The concentration of the used graminearum technical is 97%, and the concentration of the chlorine fluorine pyridine ester technical is 91.4%.

The pesticide dosage of the invention meets the national pesticide dosage requirement.

Example 1: 51% thiobencarb-chlorofluoropyridyl ester emulsifiable concentrate

Weighing the following raw materials in percentage by mass: 50% of thiobencarb, 1% of fluroxypyridine ester, 1% of castor oil polyoxyethylene ether Emulsogen EL 3605%, 700# 3% of agricultural emulsion and the balance of methyl esterified vegetable oil.

Mixing the raw materials, and stirring until a transparent uniform phase is obtained, thus obtaining the thiobencarb-fluroxypyridine ester missible oil with the mass fraction of 51%.

Example 2: 51% thiobencarb-fluroxypyridine ester dispersible oil suspending agent

Weighing the following raw materials in percentage by mass: 50% of thiobencarb, 1% of fluroxypyr meptyl, 5% of tween 60#, 1601# 4% of farm milk, 700# 7% of farm milk, 4% of bentonite and the balance of soybean oil.

The raw materials are uniformly mixed, the mixture is ground by a sand mill to ensure that the average particle size of the material is less than 5 mu m, and the sand mill is stopped to obtain the 51 mass percent of the mixture of the diclofop-methyl-p-butyl-fluroxypyridine ester dispersible oil suspending agent.

Example 3: 51% wettable powder of diclofop-p-butyl and fluroxypyridine ester

Weighing the following raw materials in percentage by mass: 50% of thiobencarb, 1% of fluroxypyridine ester, 1% of sodium lignosulfonate REAX82P 2%, 4255% of naphthalenesulfonate dispersant MORFET D, 10% of ammonium sulfate, 6% of white carbon black and the balance of kaolin.

The raw materials are added into a conical mixer together and uniformly mixed, and then are crushed by a jet mill to ensure that the average grain diameter of the materials is less than 5 mu m, thus obtaining the 51 percent wettable powder of the thiobencarb and the fluroxypyr meptyl.

Test example 1 Lepidium gramineum and fluroxypyr meptyl combined toxicity test at different ratios

1. Test conditions

1.1 test target

Echinochloa crusgalli, Euphorbia lathyris (Leptochloa chinensis), Amaranthus tricolor (Ammannia baccifera) and Cyperus difformis (Cyperus difformis) were collected from Shanghai Shangxian paddy fields in Shanghai city in 2018.

The potting method is adopted. A140-140 mm plastic nutrition pot is placed in a tray, surface soil which is collected from a farmland and is dried and sieved is filled in the nutrition pot, and water is directly added to the top of the nutrition pot, so that the soil humidity is controlled in a saturated state at the initial stage. Selecting full and uniform weed seeds, accelerating germination in an incubator (dark) at 25/30 ℃, uniformly placing the weed seeds just exposed to the white on the surface of soil, covering soil for 0.5cm, keeping the soil fully wet after sowing, and placing the weed seeds in a greenhouse with controllable sunlight for cultivation.

1.2 culture conditions

The method is carried out in a controllable sunlight greenhouse, the temperature at night is 15-20 ℃, the temperature in the daytime is 25-30 ℃, the natural illumination is carried out, and the relative humidity is 60% -75%. The soil type is loam, the organic matter content is 1.8%, and the pH is 7.1.

1.3 instrumentation

ASS-4 model automatic quantitative spraying system, GA110 model ten thousandth electronic balance; ZDR2000 intelligent data recorder, MLR-352H plant incubator.

2. Design of experiments

2.1 test Agents

97% thiobencarb, 91.4% chloropyridyl ester (florpyrauxifen-benzyl).

The two original medicine solvents are xylene, and are diluted by an emulsifier Tween 80# water solution with the content of 0.1 percent.

2.2 test treatment

2.2.1 dose setting

Based on the activity and indoor measurement characteristics of the two agents, different combinations were set based on the indoor initial measurement, as shown in tables 1 and 2, and 9 groups were designed. The indoor bioassay was carried out with water containing no drug and the same emulsifier as blank control.

2.2.2 test replicates

Each treatment was repeated 4 times, 3 pots each time, 20 weed seeds were sown per pot, 60 plants each time.

3. Treatment method

3.1 treatment time and number of treatments

The test was performed 1 time in total. And (3) thinning when barnyard grass, the 2-leaf 1-heart period of the moleplant seed, the 2-leaf period of the amaranth and the 2-leaf period of the abnormal-shape cyperus rotundus are in the period, keeping 15 weeds in each pot, and reserving 45 weeds for treatment each time.

3.2 Using the device and method of administration

The weeds are uniformly placed on a platform and sprayed by an ASS-4 type automatic quantitative spraying system, a TeeJet XR 8002 VS fan-shaped spray head, the liquid spraying amount is 450L/ha, and the spraying pressure is 0.275 MPa. And after the liquid medicine is sprayed for 30s, opening a spraying tower door, and taking out the nutrition pot. Then the air valve is opened, 100ml of clean water is sprayed, and the liquid spraying pipe is cleaned.

4. Test method

Refer to 'indoor bioassay test criteria for pesticides' -NY/T1155.9-2008 and NY/T1155.7-2006.

5. Data investigation and statistical analysis

5.1 methods of investigation

Because the concentration gradient is inconsistent in the test, the death of the low-concentration weeds is incomplete, and therefore, the fresh weight of the weeds is investigated by adopting an absolute number survey method. Cut off the surviving weed seedling along the soil surface with scissors, weigh the weed fresh weight with an analytical balance.

5.2 investigation time and number of surveys

The investigation was carried out 15 days after the treatment, and was carried out 1 time in total.

5.3 statistical analysis of data

According to survey statistics, the fresh weight inhibition rate is calculated, and the formula is as follows:

fresh weight inhibition (%) - (control fresh weight-treated fresh weight)/treated fresh weight × 100%

The theoretical fresh weight inhibition (E0) for each treatment combination was calculated by the Gowing method, and the formula is as follows:

E0＝X+Y-X×Y/100％

in the formula, X is the fresh weight inhibition rate of the thiobencarb to the target weeds when a certain dosage of thiobencarb is used singly; y is the fresh weight inhibition rate of the fluroxypyr-meptyl on the target weeds when a certain dosage is used singly; e0 is a theoretical value of the inhibition rate of the fresh weight of the target weeds when the two medicaments of the thiobencarb and the fluroxypyridine ester are mixed; e is the measured value of the inhibition rate of the fresh weight of the target weeds when the dicranostigma and the fluroxypyr-meptyl are mixed.

Evaluating the combined action type of the two on weeds, when the E-E0 value is more than 10 percent, the synergistic action is taken, when the E-E0 value is less than-10 percent, the antagonistic action is taken, and when the E-E0 value is between-10 percent and 10 percent, the addition action is taken. And the optimal proportion is determined according to factors such as actual control effect, characteristics of the herbicide, balance of the formula and the like.

The statistical results are shown in tables 1 and 2.

TABLE 1 Combined action Effect of mixture of Liaodan and fluroxypyr on barnyard grass and moleplant (Gowing method)

TABLE 2 Combined effect of therapy of mixture of dicranostin and Mexicantum vulgare on amaranth and cyperus heterophyllus (Gowing method)

The test results in the table show that the composition has good control effect on weeds in paddy fields, obvious addition or synergistic effect between active ingredients and particularly obvious synergistic effect on semen euphorbiae lathyridis. Moreover, it can be seen from the results that the larger the dose of the thiodan and the fluroxypyridine ester is, the better the effect is, without considering the dose, whereas from the viewpoint of saving the cost and reducing the dose of the raw material, the optimum dose ratio of the thiodan and the fluroxypyridine ester is 50:1,namely 1000+20, the effect is optimal, and the actual fresh weight inhibition rate can reach 98.6%. (Note: recommended amount of the product chlorofluoropyridine ester is 18 ga.i./ha) ²～36ga.i./ha²The recommended dosage of the product dicranostigma is 1500ga.i./ha²～2500ga.i./ha²Therefore, the dosage of the two is strictly controlled to meet the dosage requirement. )

Test example 2 test of field efficacy of herbicide composition in preventing and killing annual weeds in paddy field

In 2018, in Shanhai City Zhongxian district village comprehensive test station, formulation example 1 (51% of thioben-fluroxypyridine ester missible oil), formulation example 2 (51% of thioben-fluroxypyridine ester dispersible oil suspending agent), formulation example 3 (51% of thioben-fluroxypyridine ester wettable powder) and control groups (90% of thioben missible oil (produced by Jiangsu province agricultural chemical Co., Ltd.) and 3% of fluroxypyridine ester missible oil (produced by U.S. Dow Yinong Co., Ltd.) with the percentages being the content of active ingredients of the pesticide) are subjected to field pesticide effect tests for preventing and treating weeds in paddy fields, and the control effect and the safety of the pesticide on paddy fields are verified.

The test crops are rice, and the control objects are annual gramineous weeds, broad-leaved weeds and nutgrass flatsedge in the rice field: barnyard grass (Echinochloa crusgalli), semen Euphorbiae (Leptochloa chinensis), herba Amaranthi Tricoloris (Ammannia baccifera) and Cyperus difformis (Cyperus difformis) are applied, and the weeds are in the seedling stage 15 days after the rice is sowed. The test field has flat vigor, moderate soil fertility and a pH value of 7.1. The test agents and dosages are detailed in table 3. A blank control was also set, with 4 replicates per treatment, 20m per cell ²And the total number of the cells is 24, and the cells are arranged in random groups. The water consumption is 450L/ha by adopting a conventional spraying method.

The control effect of each treated weed strain is investigated 15d after the application. The investigation method comprises 4 points per cell investigation, each point is 0.25m². The drug effect calculation formula is as follows:

in the formula: CK is the number of weed plants in the control area, and PT is the number of residual weed plants in the application area.

TABLE 3 control of the field efficacy of the herbicide in the control of paddy field weeds

The results of field tests show that the dosage of 51 percent of the diclazuril-fluroxypyridine ester missible oil, 51 percent of the diclazuril-fluroxypyridine ester dispersible oil suspending agent and 51 percent of the diclazuril-fluroxypyridine ester wettable powder is 1020ga.i./h²Has good control effect on weeds in paddy fields, and the average control effect 15 days after application is obviously superior to that of 90 percent of thiobencarb emulsifiable concentrate 1500ga.i./h²3% Chlorofluoropyridine ester emulsifiable concentrate 20ga.i./h²¹The prevention and treatment effect of the composition is good. By analyzing the difference significance 15 days after the drug is applied, the difference between the combination of the graminearum and the fluroxypyr-meptyl and the control effect of other single-agent treatments is significant.

Safety investigation: after the control group 3% of the chlorofluoropyridine ester emulsifiable concentrate is applied, 7d and 15d visually find that the control group 3% of the chlorofluoropyridine ester emulsifiable concentrate has teratogenesis and dwarfing phenomena on part of rice, and except the control group 3% of the chlorofluoropyridine ester emulsifiable concentrate, the other treatments have better safety on rice seedlings and do not have the phytotoxicity phenomena of fading, dwarfing and the like.

In conclusion, the composition adopts a compounding scheme of two active ingredients, the activity and the weeding effect are not simple superposition of the activities of the components, and compared with the existing single preparation, the composition has obvious weeding effect, obvious synergistic effect, small preparation residual quantity, no pollution to crops and good safety, and meets the safety requirement of pesticide preparations.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.