阅读说明：本技术 吡嘧磺隆、西草净和丁草胺混配对水稻移栽田一年生杂草的防治 (Pyrazosulfuron-ethyl, simetryn and butachlor are mixed to control annual weeds in rice transplanting fields ) 是由 廖敏 朱维玉 曾兴玲 王争取 吴迪 欧亮亮 于 2020-06-05 设计创作，主要内容包括：本发明涉及一种除草组合物,其活性成分包括吡嘧磺隆、西草净和丁草胺。该除草组合物对水稻安全,可有效防除水稻田多种禾本科和阔叶杂草。活性成分的重量比为1-100:1-100:1-100,优选1-10：1-10：1-50,更优选1-10:1-10:20-50。本发明的除草组合物可按照本领域技术人员所已知的方法配制成农业上允许的以下剂型,如乳油、水分散粒剂、可湿性粉剂、粉剂、颗粒剂、悬浮剂、可分散油悬浮剂和大粒剂。本发明的除草组合物优选剂型为可分散油悬浮剂。所述组合物用于防除移栽水稻田、直播水稻秧田和抛秧水稻田间禾本科、阔叶和莎草科杂草中的用途。(The invention relates to a weeding composition, and active ingredients of the weeding composition comprise pyrazosulfuron-ethyl, simetryn and butachlor. The weeding composition is safe to rice, and can effectively prevent and kill various gramineae and broadleaf weeds in the paddy field. The weight ratio of the active ingredients is 1-100:1-100:1-100, preferably 1-10:1-10: 1-50, more preferably 1-10:1-10: 20-50. The herbicidal composition of the present invention can be formulated into agriculturally acceptable formulations such as emulsifiable concentrates, water dispersible granules, wettable powders, dusts, granules, suspensions, dispersible oil suspensions and macrogranules according to methods known to those skilled in the art. The herbicidal composition of the present invention is preferably in the form of a dispersible oil suspension. The composition is used for preventing and killing gramineous, broadleaf and sedge weeds in transplanted paddy fields, direct-seeding paddy rice seedling fields and seedling-throwing paddy fields.)

1. A weeding composition containing pyrazosulfuron-ethyl is characterized in that active ingredients comprise pyrazosulfuron-ethyl, simetryn and butachlor, and the weight ratio of the pyrazosulfuron-ethyl, the simetryn and the butachlor is 1-100:1-100:1-100, preferably 1-10:1-10: 1-50, more preferably 1-10:1-10: 20-50.

2. A herbicidal composition according to claim 1, characterized in that the weight ratio of pyrazosulfuron-ethyl, simetryn and butachlor is preferably 1-10:1-10: 1-50, more preferably 1-10:1-10: 20-50.

3. A herbicidal composition according to claim 1, characterized in that the active ingredient is present in an amount of 1% to 80% by weight, preferably 5% to 70% by weight.

4. The herbicidal composition as claimed in claim 1, wherein the composition is in the form of aqueous solution, suspension, suspoemulsion, dispersible oil suspension, wettable powder, water dispersible granule, microcapsule suspension-suspension.

5. A herbicidal composition according to claim 1, wherein the composition is in the form of a dispersible oil suspension.

6. Use of the herbicidal composition according to claim 1 for controlling grassy, broadleaf and sedge weeds in transplanted paddy fields, direct-seeded rice seedling fields and transplanted paddy fields.

Technical Field

The invention belongs to the field of pesticides, and particularly relates to a ternary weeding composition and application thereof.

Background

The weeds in the rice field are one of the important factors influencing the rice yield, and the application of the herbicide, particularly the mixed herbicide, for preventing and killing the weeds in the rice field is an important technical measure.

CN101444219A discloses a compound preparation of pyrazosulfuron-ethyl, prometryn and simetryn, which has excellent effects of preventing and killing barnyard grass, monochoria vaginalis, Indian iphigenia bulb, arthroncus and stranguria. CN104430460A discloses pyrazosulfuron-ethyl, clomazone and butachlor oil suspension agent for preventing and killing barnyard grass, large crabgrass, monochoria vaginalis and eclipta prostrata in paddy fields, and the prevention effect is more than 90%. CN107396928A discloses that a herbicide composition of butachlor, oxyfluorfen and simetryn has good control effect on most of weeds in transplanted paddy fields such as barnyard grass, moleplant seeds and cyperus heterophyllus in transplanted paddy fields. The mixed use of bensulfuron-methyl, pyrazosulfuron-ethyl and butachlor reported by Huang-chang et al has good weed control effect on barnyard grass and the like in paddy fields. Lihong et al reported that 28% butachlor and pyrazosulfuron WP transplanted from rice field had good control effect on barnyard grass, monochoria vaginalis, Equisetum ramosissimum and Cyperus heterotropoides. The Lucibia and others report that 73% pyrazosulfuron-ethyl, mefenacet and simetryn WP has good control effect on annual weeds such as stranguria, barnyard grass, monochoria vaginalis and ludwigia prostrata. Due to the particularities of the action of herbicides, safety to crops is a major consideration in herbicide applications. In addition, the similar herbicides or the same compound preparation can cause succession of weed communities in the paddy field after being used for a long time, so as to induce the generation of resistant weeds.

In practical application, the existing herbicides such as a compound preparation of pyrazosulfuron-ethyl, prometryn and simetryn, a compound preparation of bensulfuron-methyl, pyrazosulfuron-ethyl and butachlor and a compound preparation of butachlor and pyrazosulfuron-ethyl can obtain a certain control effect, but on one hand, the use of the herbicide still has recessive damage to rice, and the pesticide application periods are slightly different, so that obvious phytotoxicity can be caused; on the other hand, the control effect of the existing compound preparation is in a remarkably reduced trend due to the development of weed resistance.

The invention provides a safe and efficient broad-spectrum herbicide for paddy fields, which aims to effectively prevent and kill gramineous and broadleaf weeds in the paddy fields and respond to the 'reduction and synergism' call of pesticides in Ministry of agriculture.

Disclosure of Invention

The invention provides a weeding composition, and active ingredients of the weeding composition comprise pyrazosulfuron-ethyl, simetryn and butachlor. The weeding composition is safe to rice, and can effectively prevent and kill various gramineae and broadleaf weeds in the paddy field.

The weeding composition is preferably a ternary weeding composition, and the active ingredients of the weeding composition are pyrazosulfuron-ethyl, simetryn and butachlor.

The weight percentage of the active ingredients in the weeding composition is 1-90%, and preferably 10-90%.

The ternary weeding composition comprises 1-90 wt% of pyrazosulfuron-ethyl, 1-90 wt% of simetryn and 1-90 wt% of butachlor.

The weight ratio of active ingredients in the ternary weeding composition is 1-100:1-100:1-100, preferably 1-10:1-10: 1-50, more preferably 1-10:1-10: 20-50.

The herbicidal composition of the present invention can be formulated into agriculturally acceptable formulations such as emulsifiable concentrates, water dispersible granules, wettable powders, dusts, granules, suspensions, dispersible oil suspensions and macrogranules according to methods known to those skilled in the art.

The preferable preparation formulation of the weeding composition is water dispersible granules, wettable powder, suspending agent and dispersible oil suspending agent.

The herbicidal composition of the present invention is more preferably in the form of a dispersible oil suspension.

The invention also aims to provide the application of the composition in preventing and killing gramineous, broadleaf and sedge weeds in transplanted paddy fields, direct-seeded rice seedling fields and seedling-thrown rice fields.

The invention has the following beneficial effects:

1. the weeding composition is safe to rice, has high weeding activity, can effectively prevent and remove various weeds by one-time application, and has long lasting period. The application times are reduced, and the invisible damage to the rice is reduced.

2. The weeding composition of the invention has obvious synergistic control effect on barnyard grass, moleplant seed, short arrowhead and monochoria vaginalis, and is obviously superior to a single agent, a corresponding binary composition or other ternary compositions.

3. The dispersible oil suspending agent disclosed by the invention is good in stability, excellent in low-temperature stability and heat storage stability and excellent in resuspension.

Detailed Description

The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Indoor toxicity test experiment

1. Purpose of the experiment

The biological activities of pyrazosulfuron-ethyl, simetryn and butachlor on barnyard grass, moleplant seed, short arrowhead and monochoria vaginalis are measured by adopting a stem-leaf spraying method, the combined action type of the mixing of the pyrazosulfuron-ethyl, the simetryn and the butachlor is evaluated by adopting a Colby method, and scientific basis is provided for reasonable mixing of the pyrazosulfuron-ethyl, the simetryn and the butachlor and selection of the mixture ratio in production.

2. Materials and methods

2.1 test Agents

98% pyrazosulfuron-ethyl technical material provided by chemical plants in the dormiton of Anhui province;

95% simetryn (simetryn) technical product provided by chemical plants in the state of dormiton, anhui;

95% butachlor (butachlor) technical product provided by chemical plants in dorzhou, anhui.

2.2 test materials

Barnyard grass [ Echinochloa crusgalli (L.) Beauv ]: collecting and storing seeds in the field in the laboratory;

euphorbia lathyris [ Leptochloa chinensis (L.) Nees ]: collecting and storing seeds in the field in the laboratory;

arrowhead petiolus Sagittaria pygmaea Miq: collecting and storing seeds in the field in the laboratory;

monochoria vaginalis (burm.f.) c.presl ]: the seeds were collected and stored in the field in this laboratory.

2.3 test methods

2.3.1 test treatment design

(1) Pyrazosulfuron-ethyl 20g (a.i.)/hm²

(2) Pyrazosulfuron-ethyl 30g (a.i.)/hm²

(3) Pyrazosulfuron-ethyl 40g (a.i.)/hm²

(4) Pyrazosulfuron-ethyl 50g (a.i.)/hm²

(5) Pyrazosulfuron-ethyl 60g (a.i.)/hm²

(6) Simetryn 60g (a.i.)/hm²

(7) Simetryn 70g (a.i.)/hm²

(8) Simetryn 80g (a.i.)/hm²

(9) Simetryn 90g (a.i.)/hm²

(10) Simetryn 100g (a.i.)/hm²

(11) Butachlor 600g (a.i.)/hm²

(12) Butachlor 900g (a.i.)/hm²

(13) Butachlor 1200g (a.i.)/hm²

(14) Butachlor 1500g (a.i.)/hm²

(15) Butachlor 1800g (a.i.)/hm²

(16) Pyrazosulfuron-ethyl 20g + simetryn 100g + butachlor 1800g (a.i.)/hm²

(17) Pyrazosulfuron-ethyl 30g, simetryn 90g and butachlor 1500g (a.i.)/hm²

(18) Pyrazosulfuron-ethyl 40g, simetryn 80g and butachlor 1200g (a.i.)/hm²

(19) Pyrazosulfuron-ethyl 50g, simetryn 70g and butachlor 900g (a.i.)/hm²

(20) Pyrazosulfuron-ethyl 60g + simetryn 60g + butachlor 600g (a.i.)/hm²

(21)CK

2.3.2 test of the Activity of Agents on Echinochloa crusgalli

Preparing liquid medicine according to the designed treatment dosage of 2.3.1, and preparing mother liquor of each medicament: 0.1020g of 98% pyrazosulfuron-ethyl technical, 0.2105g of 95% butachlor and 2.1053g of 95% butachlor are respectively weighed in a volumetric flask by a ten-thousandth electronic balance, the pyrazosulfuron-ethyl technical, the simetryn technical and the butachlor technical are respectively dissolved by 5mL of acetone and water and then the volume is fixed to 100mL, and 1.0g/L pyrazosulfuron-ethyl, 2.0g/L simetryn mother solution and 20.0g/L butachlor mother solution are respectively obtained for later use. Each treatment was repeated four times, and the specific formulation was shown in Table 1.

TABLE 1 preparation method of pyrazosulfuron-ethyl, simetryn and butachlor treatment agents (0.25 m)²Dosage of (2)

The barnyard grass seeds are dibbled on the cross section area of 0.25m filled with soil after being soaked and sprouted²The soil is covered, and then the moisture is preserved in a bottom irrigation mode until the growth reaches 3 leaves and 1 heart stage. Spraying the liquid medicine by a POTTER precision laboratory spray tower, wherein the spraying amount is 50ml per treatment, keeping the soil moist after the liquid medicine is sprayed, and setting a clear water blank control. Repeating the treatment for 4 times, weighing the fresh weight of the overground part of each treated barnyard grass 21 days after the application, calculating the survival rate of each treatment relative to a control, and evaluating the combined action type of the three mixed parts on the barnyard grass by using a Colby method. The actual control effect of the mixed herbicide is calculated according to the following formula:

E₀＝A×B×C×…N/100^(N-1)(this test is a ternary formulation, so E₀＝A×B×C/10000)

In the formula:

a is the survival rate of group a relative to control obtained with herbicide 1 alone treatment;

b is the survival rate of group B relative to control obtained with herbicide 2 treatment alone;

c is the survival rate of group C relative to control obtained with herbicide 3 alone treatment;

n is the number of the mixed herbicide varieties;

E₀theoretical survival (percent) for herbicide 1+ herbicide 2+ herbicide 3;

e is the actual survival rate (percentage) of the mixed herbicide.

E₀-E>10% of the composition is synergistic effect; e₀-E<-10% is antagonism; E-E₀Values within. + -. 10% of theory are additive effects.

2.3.3 Activity test of Agents on Euphorbiae Lathyridis semen

After soaking seeds of the moleplant seed, accelerating germination and dibbling the seeds on a section area of 0.25m filled with soil²The rest of the parts in the basin are 2.3.2.

2.3.4 Activity assay of Agents on Arrowia Arrowiana

After the seeds of the short arrowhead are soaked, the seeds are germinated and dibbled on the soil-filled cross section area of 0.25m²The rest of the parts in the basin are 2.3.2.

2.3.5 Activity test of Agents on Ottelia communis

After soaking seeds of the monochoria vaginalis, accelerating germination and dibbling on a section area of 0.25m filled with soil²The rest of the parts in the basin are 2.3.2.

3. Results and analysis

As can be seen from the data in tables 2-5, 5 mixing agents of pyrazosulfuron-ethyl, simetryn and butachlor with different compounding ratios are used for the E of barnyard grass₀E values are 4.59%, 10.41%, 11.49%, 10.70% and 7.98%, respectively, and a certain synergistic effect is shown; for semen Euphorbiae E₀E values are respectively 20.04%, 15.18%, 13.34%, 10.29% and 5.61%, and a certain synergistic effect is shown; for short arrowhead E₀E values of 11.66%, 9.92%, 9.82%, 11.21% and 7.58% respectively show certain synergistic effect; for herba Monochorii E₀E values are respectively 9.75%, 7.30%, 10.90%, 8.83% and 5.40%, and a certain synergistic effect is shown. The synergistic effect of pyrazosulfuron-ethyl, simetryn and butachlor on barnyard grass, moleplant seed, rhizoma pleionis and monochoria vaginalis is proved.

3.1 Combined action of the admixtures on barnyard grass

TABLE 2 formulation screening of pyrazosulfuron-ethyl, simetryn and butachlor for barnyard grass (post-drug 21d)

3.2 Combined action of the combination on Euphorbiae Lathyridis semen

TABLE 3 formulation screening of pyrazosulfuron-ethyl, simetryn and butachlor compound paired moleplant seed (drug post 21d)

3.3 Combined Effect of the combination on Arrowia Arrowiana

TABLE 4 formulation screening of pyrazosulfuron-ethyl, simetryn and butachlor paired low head arrowheads (post-drug 21d)

3.4 Combined action of the combination on Ottelia communis

TABLE 5 formulation screening of pyrazosulfuron ethyl, simetryn and butachlor compound paired monochoria vaginalis (post-drug 21d)

4 conclusion

The pyrazosulfuron-ethyl has high activity on barnyard grass, moleplant seed, short arrowhead and monochoria vaginalis; the simetryn has higher activity to barnyard grass, certain activity to rhizoma pleionis and monochoria vaginalis within the range of experimental dosage, and undesirable effect to moleplant seed; butachlor has certain activity on barnyard grass, rhizoma pleionis and herba monochoriae vaginalis within the range of experimental dosage, and has undesirable effect on moleplant seed. The pyrazosulfuron-ethyl, the simetryn and the butachlor are mixed to play a synergistic role in the combined action part of the barnyard grass, the moleplant seed, the short arrowhead and the monochoria vaginalis. Therefore, the three components are mixed to prevent and control annual weeds in the rice transplanting field.

Second, preparation examples

Other names, structural formulas and basic physicochemical parameters of the active ingredients of pyrazosulfuron-ethyl, simetryn and butachlor in the product are as follows: a) pyrazosulfuron-ethyl

ISO common name: pyrazosulfurron-ethyl

CAS accession number: 93697-74-6

Chemical name 5- (4, 6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -1-methylpyrazole-4-carboxylic acid ethyl ester structural formula:

experimental formula (II): c₁₄H₁₈N₆O₇S，

Relative molecular mass (in 2011 international relative atomic mass): 414.4,

and (3) biological activity: the weeding agent is used for weeding the weeds,

melting Point (. degree. C.): 181 to 182, and a gas-liquid separator,

vapor pressure (20 ℃ C.) 1.47 × 10^-7Pa，

Solubility (20 ℃, g/L) of water 1.45 × 10^-2Methanol 0.7, hexane 0.2, benzene 15.6, trichloromethane 234.4, acetone 31.7,

stability: the product is stable for 6 months at 50 ℃; is relatively stable at pH 7 and is unstable in acidic or basic media.

b) Xicao jing

ISO common name: simetryn

CIPAC digital code number: 179

CAS accession number: 1014-70-6

Chemical name: 2-methylthio-4, 6-bis (ethylamino) -1,3, 5-triazine

Structural formula (xvi):

experimental formula (II): c₈H₁₅N₅S，

Relative molecular mass (in 2011 international relative atomic mass): 213.3,

and (3) biological activity: the weeding agent is used for weeding the weeds,

melting Point (. degree. C.): 82 to 83 of the amount of the organic solvent,

boiling point (. degree. C.): 337,

vapor pressure (20 ℃ C.) 9.5 × 10^-5Pa，

Solubility (20 ℃, g/L): 0.4 of water, 380 of methanol, 400 of acetone, 300 of toluene, 4 of n-hexane and 160 of n-octanol, and the stability: the product is stored at normal temperature for 2 years, the content of effective components is basically unchanged, and the product is easy to decompose under strong acid, strong alkali and high temperature.

c) Butachlor

ISO common name: butachlor

CIPAC digital code number: 354

CAS accession number: 23184-66-9

Chemical name of N- (2, 6-diethylphenyl) -N-butoxymethyl-chloroacetamide

Structural formula (xvi):

experimental formula (II): c₁₇H₂₆ClNO₂

Relative molecular mass (in 2011 international relative atomic mass): 311.9

And (3) biological activity: weeding

Melting point: -0.55 deg.C

Vapor pressure (20 ℃ C.): 2.4 × 10^-4Pa

Solubility (20 ℃, g/L): 0.02 percent of water, and the following organic solvents such as ethyl ether, acetone, ethanol, hexane, trichloromethane and the like can be mixed and dissolved, and the stability is as follows: stabilizing the ultraviolet light; beginning to decompose at 165 ℃; the residual time in the soil is 42-70 d.

Dispersible oil suspensions are exemplified:

1. formulation composition

66% pyriproxyfen butachlor dispersible oil suspending agent

2. Description of the working method

2.1 Process flow sheet

207.4kg of methyl oleate solvent, 24kg of auxiliary agent (10 kg of white carbon black, 10kg of organic bentonite and 24kg of tristyrylphenol polyoxyethylene ether phosphate) and emulsifier (28 kg of fatty alcohol polyoxyethylene ether and 26kg of castor oil polyoxyethylene ether) are put into a stirring kettle in proportion and stirred, then 20.4kg of 98% pyrazosulfuron-ethyl, 42.6kg of 94% simetryn and 631.6kg of 95% butachlor are put into the stirring kettle in proportion and sheared and uniformly mixed, the obtained mixture enters a sand mill, the obtained mixture is ground again after stirring, the obtained mixture is inspected again, the obtained mixture is packaged after being inspected to be qualified, and the obtained product is put into a warehouse.

Referring to FIG. 1, a particularly preferred formulation of the present invention is shown.

2.2 the production process:

(1) feeding according to the principle of first liquid and then solid.

(2) Stirring, premixing, stirring for about 1h to fully mix the materials, wherein the step is a key control point and requires qualified pH detection.

(3) And (3) sanding is started after the materials are fully mixed, the step is a key control point, and the suspension rate is required to meet the standard requirement.

(4) And (5) beating the sanded semi-finished product into a finished product kettle, and circularly stirring for 1 h.

(5) The mixture is sent for inspection after being stirred and circulated fully, and the pyrazosulfuron-ethyl, simetryn, butachlor, water, pourability, wet sieve test, dispersion stability and lasting foamability are qualified.

(6) And (5) analyzing and detecting to be qualified, subpackaging, unqualified, reworking and reworking.

(7) And (4) warehousing the qualified product after the measurement and detection, and reworking the package if the qualified product is not qualified, wherein the step is a key control point.

(8) The key points are analysis monitoring points, sampling analysis is needed, the qualified product enters the next procedure, and the unqualified product is reworked to process 2.3 production control and safety production.

(1) All raw materials need to be produced after being inspected to be qualified so as to avoid influencing the product quality.

(2) All solid raw materials are reasonably stacked according to requirements and are marked, the solid raw materials are conveyed according to the specified requirements strictly so as to avoid damage, and the raw materials with different effective components are converted and then fed.

(3) And the production plan is taken as guidance, the reasonable scheduling and the balanced production are realized, and the smooth production process is ensured.

(4) Strict operation rules are implemented, running, overflowing, dripping and leaking are reduced, dust pollution is reduced, and ventilation and night illumination are paid attention to.

(5) The operator should master the nature and basic safety knowledge of the raw materials used in the post and strictly execute the technical operating procedure 3 product quality specification.

3.1 appearance: should be a flowable, easily measurable volume of the suspending liquid.

3.2 the contents of effective components, related impurities and the like and control project indexes.

66% pyriproxyfen butachlor dispersible oil suspending agent control project index

Note: in normal production, the test of low-temperature stability and heat storage stability is carried out at least 1 time every 3 months.

4. Product quality measurement results

The pourability test is carried out according to GB/T31737, and the result is qualified.

The permanent foaming test is carried out according to GB/T28137, and the result is qualified.

The wet sieve test is carried out according to the 'wet sieve method' in GB/T16150, and the result is qualified.

The low temperature stability test was performed as 2.2 in GB/T19137-2003. And 2 indexes of dispersion stability and wet sieve test are tested, and the result is qualified.

The heat storage stability test is carried out according to 2.1 in GB/T19136-2003, and the result is qualified.

Third, field drug effect test

Field efficacy test for preventing and removing transplanted paddy weeds

The inventor carries out a test of 66% pyrazac-west-butachlor dispersible oil suspending agent on weeds in a paddy field in rice transplanting fields of Changsha city in Hunan province on 5-17 days in 2019.

The field weed community mainly comprises barnyard grass, moleplant seed, short arrowhead and monochoria vaginalis, the distribution is uniform, and the leaf age of the weeds is in the 2-4 leaf stage. Test agents and dosages: 66% of pyrazac-west-butachlor dispersible oil suspending agent, 40g of a.i./mu, 80g of a.i./mu and 120g of a.i./mu.

Control agents: 6 percent of butachlor, oxyfluorfen and simetryn (2% + 2% + 2%) emulsifiable concentrate, 80g of a.i./mu,

66% pyrazosulfuron-ethyl clomazone butachlor (1% + 10% + 55%) dispersible oil suspending agent, 80g a.i./mu,

28% butachlor pyrazosulfuron-ethyl (1.4% + 26.6%) wettable powder, 40g a.i./mu,

60 percent of butachlor missible oil, 60g of a.i./mu,

10 percent pyrazosulfuron-ethyl wettable powder, 2.0g a.i./mu,

10% of simetryn wettable powder, 20g a.i./mu.

And the clear water treatment was set as a blank Control (CK), for 10 treatments in total. Each treatment was repeated 4 times for a total of 40 cells. The area of each cell is about 30m²And the small zones are arranged randomly, and are ridged and isolated to prevent serial irrigation and flood irrigation. The application is carried out in a conventional manner. The weed control effect is investigated 14 days and 30 days after the pesticide application, and the fresh weight control effect is investigated 30 days at the same time. After the application, the phytotoxicity condition of the rice is continuously observed, and the rice yield of each cell is measured in the harvest period.

TABLE 6 herbicide control effect on rice transplanting field weed (average plant control effect%)

TABLE 7 herbicide control effect of 66% pyriproxyfen dispersible oil suspension agent on paddy transplanting field 30 days after the drug (average plant control effect%)

Table 8 shows that 66% of pyrazachlor-butachlor dispersible oil suspending agent has weed control effect (fresh weight control effect%) on rice transplanting fields 30 days after pesticide application

The test result shows that: the average plant control effect of 66% pyraclonil butachlor OD on barnyard grass, moleplant seed, short arrowhead and herba monochoriae 14 days after being applied with 40g a.i./mu dosage is higher than 90%, is obviously higher than that of a control medicament 6% butyl ethoxy butachlor EC and 66% pyraclonil isobutangulon OD, and is also obviously higher than that of a corresponding binary composition and a single agent. Namely, 30 days after the drug is taken, the ternary composition can still basically maintain more than 90 percent of drug effect. The fresh weight control effect of the pesticide is higher than 90 percent in 30 days after the pesticide is applied, and is obviously higher than that of a control pesticide, so that the pesticide has better lasting period and obvious synergistic effect when being used in a field after being mixed. The prolonging of the lasting period means that the subsequent pesticide application can be reduced, and the aim of reducing the dosage and improving the efficiency is achieved.

No obvious phytotoxicity is found in the whole growth period.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.