CN106342865A - Herbicide composite for wheat paddocks - Google Patents

Abstract

The invention belongs to the technical field of pesticides, and discloses a ternary weeding composite consisting of Pyrasulfotole, mesosulfuron and tribenuron-methyl. According to the composite, the weight ratio of three active ingredients is (0.75-12):(0.25-4):(0.375-6), and the weight content of the active ingredients in the composite is 5-85%. The weeding composite, which is an ideal herbicide, can prevent and kill off various weeds in wheat paddocks to improve the prevention effect of the weeds in the wheat paddocks and is little in active ingredients, low in using cost and safe to wheat and afterreap crops.

Description

A kind of herbicide composition for wheat field

[technical field]

The invention belongs to technical field of pesticide is and in particular to one kind is with pyrasulfotole, mesosulfuron and tribenuron-methyl For the herbicidal composition of active component, for eliminating weed in wheat field.

[background technology]

Semen Tritici aestivi is a kind of grass in extensively plantation all over the world, in China, Semen Tritici aestivi be Three major grain crops it One, cereal crops occupy critical role.But, China's major part wheat paddock always has different degrees of crop smothering to occur, These weeds species are many, and distribution is wide, and growing power is vigorous, and individual plant area coverage is big, the yield of serious harm Semen Tritici aestivi.In recent years, close Reason has become as the important technical links guaranteeing Semen Tritici aestivi safety in production from wheat field herbicide, but due to inappropriate medication or use Technology is not in place, leads to prevention effect undesirable or produce the phenomenons such as poisoning occur repeatedly.Standing grain can be prevented and kill off in the market simultaneously Seldom, this is accomplished by the repeated multiple times medication of people to prevent and kill off all kinds of weeds the herbicide kind of undergraduate course weeds and broad leaved weed, this Sample one side wastes substantial amounts of manpower and materials, on the other hand, causes pesticide exceeded to the pollution of environment and pesticide residues, gives Human health brings direct harm.So, the initiative of new and effective herbicide and the exploitation of complex preparation, will substantially reduce and remove The labor intensity of grass and cost, promote the raising of agricultural modernization level.

Pyrasulfotole, other titles: sulphonyl grass pyrazoles, pyrrole sulfone fluorine ketone, chemical name: (5- hydroxyl -1,3- diformazan Base pyrazoles -4- base) (α, α, α-three fluoro- 2- mesyl-p- tolyl) ketone, structural formula is:

Pyrasulfotole is the pyrazoleses high activity interior suction postemergence weed control of preventing and treating cereal crop field broadleaf weed Agent, is hppd inhibitor, is mainly absorbed by blade, is conducted with root to plumelet by phloem and xylem, in enzyme and suppression After agent intimate association, produce inhibitory action as time went on and slowly, due to the suppression to hppd, hinder p- hydroxyphenyl third Keto acid, to the transformation of 2,5-dihydroxy-.alpha.-toluic acid., thus indirectly suppressing the biosynthesiss of carotenoid, causes plant meristem albefaction, finally Dead.Pyrasulfotole can effectively prevent and treat most of broad leaved weed, but invalid to grassy weed.

Mesosulfuron (mesosulfuron-methyl), other titles: mesosulfuronmethyl, generation agate, chemical name: 2- (4,6- dimethoxypyridin -2- base amino carbonyl amino sulfonyl)-α-(sulfonyloxy methyl amido) methyl p-methyl benzoate, knot Structure formula is:

Mesosulfuron is sulfonylurea inner sucting conduction type after seedling selective herbicide, is acetolactate synthestase (als) Inhibitor, grass cutting blade absorb medicament after stop growing, gradually withered.The longevity of residure in soil for this medicine is short, not under the influence of Stubble plant growth, is mainly used in wheat paddock and prevents and kill off multiple grassy weeds such as amur foxtail, wild oat, caput grass, annual bluegrass, firmly Grass, alkali thatch, Itanlian rye, lolium temulentum, Herba bromi japonici etc., but undesirable to broad leaved weed preventive effect.In addition, mesosulfuron is as single dose When wheat paddock uses, on the premise of ensureing drug effect, consumption is of a relatively high, there is poisoning hidden danger.

Tribenuron-methyl (tribenuron-methyl), other titles: superstar, broad-leaved are net, chemical name: 2- [4- methoxyl group- 6- methyl isophthalic acid, 3,5- triazine -2- base (methyl) carbamoylamino sulfonyls] essence of Niobe, structural formula:

Tribenuron-methyl belongs to sulfonylurea inner sucting conduction type after seedling selective herbicide, is acetolactate synthestase (als) suppression Agent, can directly be absorbed by the root of weeds, stem, leaf after cauline leaf process, and conduct in vivo, by suppressing acetolactate synthestase Activity works, and shows as growing point necrosis, vein chlorosis, plant growing are heavily suppressed, downgrade, finally after weeds are aggrieved Herb is dead.It is mainly used in the cereal crop fields such as Semen Tritici aestivi, Fructus Hordei Vulgaris and prevent and kill off broad leaved weed, Er Qieyou invalid to grassy weed Continuously using for a long time in tribenuron-methyl, many weeds are to which creating resistance.

In order to make up above each single dose deficiency in actual use, people by any of the above single dose respectively with other Herbicide is used in mixed way, for example: patent cn200910144096.8 discloses the mesosulfuron herbicide mixed with tribenuron-methyl Compositionss, but both herbicides are all sulfonylurea herbicides, and its target enzymes is all als, and action site is single, and both compound Compositionss so that weeds is developed immunity to drugs.

European patent ep2232999 (a1) disclose pyrasulfotole with including mesosulfuron, iodine metsulfuron-methyl Several herbicides and safener use with 27 kinds of compounding modes, but the compositionss disclosed in this patent be required to add safety Agent is to reach the purpose to crop safety.

Our company discloses pyrasulfotole and methyl two sulphur in patent cn201310412713.4 of application in 2013 Grand compounding compositionss, but find that both are compounding in actual use and still have part broad leaved weed can not prevent and kill off, therefore, this Inventor furthers investigate, and has been surprisingly found that on the basis of the screening of substantial amounts of formula indoor and field control effectiveness test, Pyrasulfotole is compounding in certain ratio range with mesosulfuron and tribenuron-methyl, both can make up pyrasulfotole The deficiency individually compounding with mesosulfuron, can delay the Drug resistance to sulfonylurea herbicide for the weeds again, solve herbicide Alone in weed control spectrum, preventive effect and limitation present on safety, reached expansion weed control spectrum, improve preventive effect, improve safety Purpose.

[content of the invention]

It is an object of the invention to according to the present situation of current wheat field herbicide, and weeds of wheat a situation arises, There is provided that a kind of broad weed-killing spectrum, herbicidal effect are good, use safety, be conducive to the herbicidal composition of weeds of wheat comprehensive control.

Present invention employs a kind of following technical scheme: herbicide composition for wheat field, become containing tri- kinds of activity of a, b and c Point, wherein active component a is pyrasulfotole, and active component b is mesosulfuron, and active component c is tribenuron-methyl.

Specifically, in described herbicidal composition, the weight ratio of active component a, b and c is: (0.75-12): (0.25-4): (0.375-6), preferably: (0.75-6): (0.25-2): (0.375-3), more preferably: (1.5-4.5): (0.4- 1.4): (0.6-2), still more preferably for (2-3.5): (0.6-1.1): (0.8-1.5), optimum weight ratio is: 2.5:0.8: 1.

Present invention also offers the preparation containing above-mentioned composition, in described preparation, the weight percentage of effective ingredient is 5- 85%.

Described preparation is any one dosage form agriculturally allowing, preferably wettable powder, water dispersible granules, suspending agent, Dispersible the various dosage forms of the suitable agricultural use such as oil-suspending agent, more preferably wettable powder.

In described preparation, also contain auxiliary agent, specially dispersant, wetting agent, disintegrating agent, emulsifying agent, adhesive or carrier One or more of Deng.

For wettable powder, can used additives include: dispersant is selected from lignosulfonates, polycarboxylate, alkylnaphthalene sulphur In hydrochlorate, dodecylbenzene sodium sulfonate, alkyl polyoxyethylene ether sulfonate or alkylphenol-polyethenoxy base ether formaldehyde condensation products etc. One or more；Wetting agent gathers selected from sodium lauryl sulphate, Teepol, fatty alcohol-polyoxyethylene ether, nonyl phenol One or more of oxygen vinyl Ether or sorbitan fatty acid ester polyoxyethylene ether etc.；Carrier be selected from Kaolin, kieselguhr, One or more of attapulgite, bentonite or white carbon etc..

For water dispersible granules, can used additives include: dispersant is selected from polycarboxylate, lignosulfonates, alkylnaphthalene sulphur One or more of hydrochlorate, alkylphenol polyoxyethylene or alkylphenol polyoxyethylene sulfonate etc.；Wetting agent is selected from naphthalene sulphur Hydrochlorate, aliphatic alcohol sulfate, dodecyl benzene sulfonate, sodium lauryl sulphate, fatty alcohol-polyoxyethylene ether or alkyl sulfonic acid One or more of salt etc.；Disintegrating agent is selected from ammonium sulfate, carbamide, corn starch and its derivant, low substituted hydroxy-propyl fiber One or more of element, Polyvinylpyrrolidone or sodium alginate etc.；Adhesive is selected from hydroxyethyl cellulose, solubility is formed sediment One or more of powder, Polyethylene Glycol, methylcellulose, dextrin, Fructose or polyvinyl alcohol etc.；Carrier is selected from white carbon, height One or more of ridge soil, bentonite, kieselguhr, precipitated calcium carbonate, Gypsum Fibrosum, attapulgite, carbamide or sucrose etc..

For suspending agent, can used additives include: dispersant be selected from polycarboxylate, lignosulfonates, alkylnaphthalene sulfonate, One or more of tersperse2425, alkylphenol polyoxyethylene etc.；Wetting agent is selected from alkylphenol-polyethenoxy Ji Mijia Aldehyde condensate sulfate, alkylphenol-polyethenoxy base ether phosphate, phenethyl phenol polyoxyethylene groups ether phosphate, alkylsurfuric acid One or more of salt, naphthalene sulfonate etc.；Thickening agent be selected from xanthan gum, carboxymethyl cellulose, sodium polyacrylate, bentonite, One or more of aluminium-magnesium silicate etc.；Antifreezing agent is selected from one or more of ethylene glycol, propylene glycol, glycerol, carbamide etc.；Anti- Rotten agent is selected from one or more of formaldehyde, sorbic acid, sodium benzoate etc.；Defoamer can be silicone defoamer.

For dispersibling oil-suspending agent, can used additives include: dispersant is selected from methyl naphthalene sulfonic acid salt formaldehyde condensation products, poly- carboxylic One or more of hydrochlorate, lignosulfonates, alkylnaphthalene sulfonate etc.；Wetting agent is selected from alkylphenol polyoxyethylene formaldehyde One of condensate sulfate, alkylphenol polyoxyethylene phosphate ester, alkyl sulfate, alkylsulfonate, naphthalene sulfonate etc. Or it is multiple；Emulsifying agent is selected from castor oil polyoxyethylene ether, Nongru-700 #, agriculture breast 2201, anhydrous sorbitol single-hard ester acid ester polyoxy One or more of vinyl Ether etc.；Thickening agent be selected from one of bentonite, polyvinyl alcohol, xanthan gum, aluminium-magnesium silicate etc. or Multiple；Defoamer can be silicone；Cosolvent is selected from one or more of methanol, ethanol, dimethyl sulfoxide etc.；Dispersion Medium is selected from one or more of Semen Maydis oil, soybean oil, Oleum Brassicae campestriss, methyl oleate etc..

Salt described in above-mentioned auxiliary agent such as polycarboxylate, lignosulfonates etc. are sodium salt or calcium salt.

The beneficial effect that herbicidal composition of the present invention possesses: (1) herbicidal composition of the present invention has Synergistic and makees With；(2) three kinds of active component of herbicidal composition of the present invention are had complementary advantages, and to Semen Tritici aestivi and succession crop safety, decrease simultaneously The consumption of effective ingredient, reduces the adverse effect to environment；(3) herbicidal composition broad weed-killing spectrum of the present invention, can be disposable Prevent and kill off the various weeds of wheat paddock；(4) the herbicidal composition optimum period for applying fertilizer of the present invention extends, and herbicide is thorough；(5) herbicide of the present invention Compositionss can delay the generation of herbicide resistance, thus delaying the succession speed of weed community.

[specific embodiment]

In order that the objects, technical solutions and advantages of the present invention become more apparent, present invention specific examples below Illustrate, but be only limitted to absolutely not this.Described below be the preferable embodiment of the present invention, be used only for describe the present invention it is impossible to Be interpreted as limitation of the present invention it should be pointed out that be any modification, equivalent made within the spirit and principles in the present invention Replace and improve, should be included within the scope of the present invention.

Example of formulations 1:43%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder

Weigh 25%pyrasulfotole, 8% mesosulfuron, 10% tribenuron-methyl, 8% lignosulfonates, 2% secondary Alkyl sodium sulfate, attapulgite complement to 100%, after mix homogeneously, premenstrual mixing, comminution by gas stream, rear mix, obtain 43% Pyrasulfotole mesosulfuron tribenuron-methyl wettable powder.

Example of formulations 2:31%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder

Weigh 20%pyrasulfotole, 5% mesosulfuron, 6% tribenuron-methyl, 10% alkyl polyoxyethylene ether sulfonic acid Sodium, 2% sodium lauryl sulphate, kieselguhr complement to 100%, after mix homogeneously, premenstrual mixing, comminution by gas stream, rear mix, obtain 31%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder.

Example of formulations 3:80%pyrasulfotole mesosulfuron tribenuron-methyl water dispersible granule

Weigh 45%pyrasulfotole, 15% mesosulfuron, 20% tribenuron-methyl, 6% sodium lignin sulfonate, 2% fat Fat alcohol sulfate, 1% ammonium sulfate, 0.2% Polyethylene Glycol, Kaolin complement to 100%, after mix homogeneously, premenstrual mixing, air-flow Pulverize, mix afterwards, add water kneading, pelletize, screening, obtaining 80%pyrasulfotole mesosulfuron tribenuron-methyl moisture and dissipate Granule.

Example of formulations 4:25%pyrasulfotole mesosulfuron tribenuron-methyl water dispersible granule

Weigh 15%pyrasulfotole, 4% mesosulfuron, 6% tribenuron-methyl, 4% polycarboxylic acids sodium, 2% poly alkyl alcohol Oxygen vinyl Ether, 1% sodium alginate, 0.5% polyvinyl alcohol, precipitated calcium carbonate soil complement to 100%, after mix homogeneously, premenstrual mixed Conjunction, comminution by gas stream, mix afterwards, add water kneading, pelletize, screening, obtains 25%pyrasulfotole mesosulfuron tribenuron-methyl Water dispersible granules.

Example of formulations 5:17%pyrasulfotole mesosulfuron tribenuron-methyl suspending agent

Weigh 10%pyrasulfotole, 3% mesosulfuron, 4% tribenuron-methyl, 6%tersperse2425,5% alkane Base phenol polyethenoxy base ether phosphate, 2% xanthan gum, 2% ethylene glycol, 0.5% sorbic acid, 1% organic silicon defoamer, deionization Water complements to 100%, after mix homogeneously, obtains 17%pyrasulfotole methyl after high speed shear dispersion, sand mill sand milling Two sulphurs grand tribenuron-methyl suspending agent.

Example of formulations 6:46%pyrasulfotole mesosulfuron tribenuron-methyl suspending agent

Weigh 25%pyrasulfotole, 6% mesosulfuron, 15% tribenuron-methyl, 3% polycarboxylic acids sodium, 5% phenethyl Phenol polyethenoxy base ether phosphate, 0.2% sodium polyacrylate, 0.3% carboxymethyl cellulose, 0.5% sorbic acid, 0.2% organic Silicon defoaming agent, deionized water complement to 100%, after mix homogeneously, obtain 46% after high speed shear dispersion, sand mill sand milling Pyrasulfotole mesosulfuron tribenuron-methyl suspending agent.

Example of formulations 7:31%pyrasulfotole mesosulfuron tribenuron-methyl dispersibles oil-suspending agent

Weigh 8%pyrasulfotole, 11% mesosulfuron, 12% tribenuron-methyl, 2% polycarboxylic acids sodium, 5% alkyl phenol Polyoxyethylene ether phosphate, 8% ethoxylated castor oil, 0.3% xanthan gum, 0.1% organic silicon defoamer, 2% methanol, Semen Maydiss Oil complements to 100%, after mix homogeneously, and ground or high speed shear is disperseed, and obtains final product described 31%pyrasulfotole methyl The grand tribenuron-methyl of two sulphurs dispersibles oil-suspending agent.

Example of formulations 8:29%pyrasulfotole mesosulfuron tribenuron-methyl dispersibles oil-suspending agent

Weigh 17%pyrasulfotole, 5% mesosulfuron, 7% tribenuron-methyl, 7% methyl naphthalene sulfonic acid salt formaldehyde condensation Thing, 6% alkyl sodium sulfate, 5% agriculture breast 2201,0.3% polyvinyl alcohol, 0.15% organic silicon defoamer, 4% dimethyl sulfoxide, Semen Maydis oil complements to 100%, after mix homogeneously, and ground or high speed shear is disperseed, and obtains final product described 29%pyrasulfotole Mesosulfuron tribenuron-methyl dispersibles oil-suspending agent.

Raw embodiment 1 of surveying:

Pyrasulfotole, mesosulfuron and tribenuron-methyl compound synergy mensure and Herbicidal test

In order to prevent and kill off the weeds of wheat in agricultural production, inventor carried out pyrasulfotole, mesosulfuron with The mutually compounding potentiation research of tribenuron-methyl, carries out cauline leaf process using indoor pot method, test is with reference to " Chinese people's republicanism State's agricultural industry criteria ny/t 1155.7-2006 farm-chemical indoor determination test rule herbicide " the 7th part: mixture The colby method that synergy is instructed in measuring.

1st, reagent agent

98%pyrasulfotole active compound

95% mesosulfuron active compound

95% tribenuron-methyl active compound

2nd, for examination weeds

Descurainia sophia (l.) webb ex prantl, Fructus Kochiae, wild oat

Culture for trying weeds adopts potted plant culture method, with 11 × 12cm plastic tub, is placed in shallow-water tank, will not make The soil adopted back in the farmland of used herbicide air-dries, and fills basin after sieving, at dry ground quantitative 4/5 in basin, soil ph value 7.0, and have Machine matter content 1.2%.After making soil completely moistening with basin alms bowl bottom infiltrating irrigation mode, pretreatment is quantitatively spread for examination weed seed It is sowed at soil surface, according to seed size earthing 0.5cm～1.0cm, 28～32 DEG C/18～25 DEG C of indoor temperature (d/n), relatively Humidity 75% ± 15%.Adopt the bottom infiltrating irrigation mode moisturizing of basin alms bowl in incubation, keep soil to be sufficiently humidified so as to.Treat that weeds emerge Afterwards wild oat is set to 10 plants, descurainia sophia (l.) webb ex prantl and Fructus Kochiae are set to 5 plants.

3rd, EXPERIMENTAL DESIGN

Test sets 41 process altogether, wherein pyrasulfotole sets 0.75,1.5,3,6, at 12g a.i./mu 5 dosage Reason, mesosulfuron sets 0.25,0.5,1,2,4g a.i./mu 5 dosage process, tribenuron-methyl sets 0.375,0.75,1.5,3,6g A.i./mu 5 dosage is processed, and pyrasulfotole+ mesosulfuron+tribenuron-methyl three uses with and sets up 0.75+0.25+ separately 0.375、0.75+0.5+0.75、0.75+1+1.5、0.75+2+3、0.75+4+6、1.5+0.25+0.75、1.5+0.5+1.5、 1.5+1+3、1.5+2+6、1.5+4+0.375、3+0.25+1.5、3+0.5+3、3+1+6、3+2+0.375、3+4+0.75、6+ 0.25+3、6+0.5+6、6+1+0.375、6+2+0.75、6+4+1.5、12+0.25+6、12+0.5+0.375、12+1+0.75、12 25 dosage ratios of+2+1.5,12+4+3g a.i./mu are processed, and separately set an auxiliary agent comparison, 41 process, are repeated 4 times altogether.

4th, test method

It is placed in spray (ass-4 type pesticide spraying system in spray tower in grassy weed 2-4 leaf phase, broad leaved weed 3-5 leaf System, dg8003 shower nozzle, atomisation pressure 2.75mpa, spouting liquid 30kg/ mu), it is placed in warm indoor cultivation after natural air drying and observe.

5th, weedy rices and analysis method

After dispenser, the growth conditions of routine observation weeds, poisoning symptom and poisoning degree, record symptom of chemical damage, 21 after medicine It weighs aerial partss fresh weight, calculates weeds survival rate e, and the type of action using the mixed medicament of colby method evaluation, further Inquire into the reasonability of proportioning.

E=treatment region weeds fresh weight × 100/ check plot weeds fresh weight ... ... ... ... ... (1)

Colby method computing formula:

$e_0=\frac{xyz}{10000}\mathrm{...}\left(2\right)$

X consumption is the weeds survival rate of herbicide a during p；

Y consumption is the weeds survival rate of herbicide b during q；

Z consumption is the weeds survival rate of herbicide c during w；

e₀Consumption is the theoretical weeds survival rate of herbicide (a+b+c) when (p+q+w)；

e₀- e ＞ 10% is potentiation；e₀- e ＜ -10% is antagonism；e₀- e-value is summation action between ± 10%.

6th, result and analysis in table 1-3

Table 1 pyrasulfotole, mesosulfuron and tribenuron-methyl mixture are deposited to the actual measurement survival rate of descurainia sophia (l.) webb ex prantl and theory Motility rate

Pyrasulfotole, mesosulfuron co-toxicity to descurainia sophia (l.) webb ex prantl mixed with tribenuron-methyl: pyrasulfotole To the preventive effect of descurainia sophia (l.) webb ex prantl preferably, descurainia sophia (l.) webb ex prantl has drug resistance to tribenuron-methyl, mesosulfuron to descurainia sophia (l.) webb ex prantl to no effect, with The increase of pyrasulfotole consumption, improves to the preventive effect of descurainia sophia (l.) webb ex prantl after using with.

Table 2 pyrasulfotole, mesosulfuron and tribenuron-methyl mixture are survived to the actual measurement survival rate of Fructus Kochiae and theory Rate

Pyrasulfotole, mesosulfuron co-toxicity to Fructus Kochiae mixed with tribenuron-methyl: tribenuron-methyl is prevented to Fructus Kochiae Preferably, pyrasulfotole is slightly worse to the preventive effect of Fructus Kochiae for effect, mesosulfuron to Fructus Kochiae to no effect, with tribenuron-methyl consumption Increase, after using with, the preventive effect of Fructus Kochiae is improved.

Table 3 pyrasulfotole, mesosulfuron and tribenuron-methyl mixture are deposited to the actual measurement survival rate of wild oat and theory Motility rate

Pyrasulfotole, mesosulfuron co-toxicity to wild oat mixed with tribenuron-methyl: mesosulfuron is to open country The preventive effect of Herba bromi japonici is good, and pyrasulfotole and tribenuron-methyl to wild oat to no effect, with the increase of mesosulfuron consumption, mix Improved with the rear preventive effect to wild oat.

Toxicity Determination result shows, pyrasulfotole, mesosulfuron and tribenuron-methyl are in weight ratio (0.75- 12): (0.25-4): in the range of (0.375-6), the mixed preventive effect to weeds shows as being added or potentiation, in weight ratio (0.75-6): (0.25-2): mixed in the range of (0.375-3) have obvious potentiation, expands weed control spectrum, has reached same When prevent and kill off the purpose of wheat paddock main weeds.

Raw embodiment 2 of surveying:

Pyrasulfotole, mesosulfuron and tribenuron-methyl compound the safety testing to Semen Tritici aestivi

The safety mutually compounding in order to study pyrasulfotole, mesosulfuron and tribenuron-methyl, inventor done with Lower test, test is with reference to " People's Republic of China's agricultural industry criteria ny/t 1155.8-2007 farm-chemical indoor determination is real Test criterion herbicide " the 8th part: the safety testing stem and leaf nebulization of crop.

1st, reagent agent

98%pyrasulfotole active compound

95% mesosulfuron active compound

95% tribenuron-methyl active compound

2nd, for studying thing

Semen Tritici aestivi

Culture for studying thing adopts greenhouse pot culture method, with 11 × 12cm plastic tub, is placed in shallow-water tank, will not make The soil adopted back in the farmland of used herbicide air-dries, and fills basin after sieving, at dry ground quantitative 4/5 in basin, soil ph value 7.0, and have Machine matter content 1.2%.After top-watered makes soil completely moistening, wheat seed is quantitatively broadcasted sowing in soil surface, according to kind Sub- size earthing 0.5cm～2.0cm, 28～32 DEG C/18～25 DEG C of indoor temperature (d/n), relative humidity 75% ± 15%.Culture During adopt the bottom infiltrating irrigation mode moisturizing of basin alms bowl, keep soil be sufficiently humidified so as to.After Semen Tritici aestivi is emerged, Semen Tritici aestivi is set to 10 plants.

3rd, for examination weeds

Descurainia sophia (l.) webb ex prantl, Fructus Kochiae, Herba chenopodii, caput grass, amur foxtail, wild oat

Culture for trying weeds adopts greenhouse pot culture method, with 11 × 12cm plastic tub, is placed in shallow-water tank, will not make The soil adopted back in the farmland of used herbicide air-dries, and fills basin after sieving, at dry ground quantitative 4/5 in basin, soil ph value 7.0, and have Machine matter content 1.2%.After making soil completely moistening with basin alms bowl bottom infiltrating irrigation mode, pretreatment is quantitatively spread for examination weed seed It is sowed at soil surface, according to seed size earthing 0.5cm～1.0cm, 28～32 DEG C/18～25 DEG C of indoor temperature (d/n), relatively Humidity 75% ± 15%.Adopt the bottom infiltrating irrigation mode moisturizing of basin alms bowl in incubation, keep soil to be sufficiently humidified so as to.Treat that weeds emerge Afterwards caput grass, amur foxtail, wild oat are set to 10 plants, descurainia sophia (l.) webb ex prantl, Fructus Kochiae, Herba chenopodii are set to 5 plants.

4th, EXPERIMENTAL DESIGN

Test sets 41 process altogether, wherein pyrasulfotole sets 1,2,4,8,16g a.i./mu 5 dosage process, first Base two sulphur is grand to set 0.375,0.75,1.5,3,6g a.i./mu 5 dosage process, tribenuron-methyl sets 0.5,1,2,4,8g a.i./mu 5 dosage are processed, and pyrasulfotole+ mesosulfuron+tribenuron-methyl three uses with and sets up 0.75+0.25+0.375,0.75+ separately 0.5+0.75、0.75+1+1.5、0.75+2+3、0.75+4+6、1.5+0.25+0.75、1.5+0.5+1.5、1.5+1+3、1.5+2 +6、1.5+4+0.375、3+0.25+1.5、3+0.5+3、3+1+6、3+2+0.375、3+4+0.75、6+0.25+3、6+0.5+6、6 +1+0.375、6+2+0.75、6+4+1.5、12+0.25+6、12+0.5+0.375、12+1+0.75、12+2+1.5、12+4+3g A.i./mu 25 dosage ratio is processed, and separately sets an auxiliary agent comparison, 41 process, are repeated 4 times altogether.

5th, test method

It is placed in spray in spray tower whne Semen Tritici aestivi 3-5 leaf phase, grassy weed 2-4 leaf phase, broad leaved weed 3-5 during the leaf phase (ass-4 type pesticide spraying system, dg8003 shower nozzle, atomisation pressure 2.75mpa, spouting liquid 30kg/ mu), treats that natural air drying is rearmounted Observe in warm indoor cultivation.

6th, crop investigation

After dispenser, investigation each process Semen Tritici aestivi has or not symptom of chemical damage, if having, itemized record symptom of chemical damage, grade, 21 after medicine Its measurement each process Semen Tritici aestivi fresh weight, calculates fresh weight inhibition, with the safety to Semen Tritici aestivi for the clear and definite test medicine.

Table 4 poisoning evaluation index

Poisoning is classified	Poisoning degree (%)	Result describes
			0	0	Safety, no poisoning
1	1～10	No substantially poisoning
			2	11～30	Slight poisoning
3	31～50	Moderate poisoning
			4	＞ 50	Serious poisoning

7th, weedy rices

After dispenser, periodical visual inspection observes growth conditions, poisoning symptom and the poisoning degree of weeds, records symptom of chemical damage.After medicine Adopt the fresh weight preventive effect that growth inhibition assay calculates each process within 21 days.

Growth inhibition assay computing formula:

$e=\frac{t_0-t_1}{t_0}\×\mathrm{100...}\left(3\right)$

In formula:

E fresh weight preventive effect, unit is percentage rate (%)；

t₀Comparison weeds aerial partss fresh weight, unit be gram；

t₁Process weeds aerial partss fresh weight, unit be gram.

8th, result and analysis

Table 5 respectively processes the preventive effect to weeds and the poisoning classification to Semen Tritici aestivi

It can be seen from Table 5 that pyrasulfotole mesosulfuron tribenuron-methyl mixture is compared with single dose, in weight Than (0.75-12): (0.25-4): in the range of (0.375-6), the preventive effect to wheat paddock main weeds and the safety to Semen Tritici aestivi It is above single dose, to Semen Tritici aestivi safety.

In sum, pyrasulfotole is compounded within the specific limits with mesosulfuron and tribenuron-methyl significant increasing Effect acts on, and to crop safety, complex preparation is not only wheat paddock and provides a kind of safe, practical herbicide, and significantly drops Di Liao enterprise and the cost of peasant household.

Raw embodiment 3 of surveying:

Eliminating weed in wheat field field control effectiveness test:

1st, test process

Test sets 12 process, 4 repetitions, totally 48 process cells, often processes 20 square metres of plot area, random district's groups Arrangement.(1)～(9) 43%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder is reagent agent, (10)～ (12) 5%pyrasulfotole suspension emulsion, 3% mesosulfuron dispersibles oil-suspending agent, 75% tribenuron-methyl water dispersible granule is Comparison medicament.Every mu is watered 30 kilograms, using 552 third type aerosol apparatus (0.7mm aperture) even spraying.Field main weeds are broadcast Ma Artemisia, Fructus Kochiae, Herba chenopodii, caput grass, amur foxtail, wild oat etc..

2nd, pilot project and method

(1) safety: after dispenser, the growth promoter situation of investigation Semen Tritici aestivi, evaluate the safety to Semen Tritici aestivi for the reagent agent.

(2) herbicidal effect: every cell takes at random at 4 points, investigates 1/4 square metre at every, investigation weed control in 30 days after dispenser Effect, record weeds species and strain number respectively, calculate weeds strain preventive effect.

(3) result of the test

Safety: investigate after dispenser, (1)～(9) chemicals treatment district Plant Height in Wheat, leaf color and blank district basic Cause, and (10)～(12) treatment region Semen Tritici aestivi shows that leaf chlorosis, plant strain growth are suppressed, wheat seedling height is uneven to wait poisoning disease Shape, shows reagent agent (1)～(9) 43%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder all to little Wheat safety.

Herbicidal effect, is shown in Table 6:

Table 6 43%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder is prevented and kill off to weeds of wheat Effect

Note: (1) 43%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder (0.75:2:0.375)

(2) 43%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder (1:1.7:0.4)

(3) 43%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder (1.5:1.4:0.6)

(4) 43%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder (2:1.1:0.8)

(5) 43%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder (2.5:0.8:1)

(6) 43%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder (3.5:0.6:1.5)

(7) 43%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder (4.5:0.4:2)

(8) 43%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder (5.5:0.3:2.5)

(9) 43%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder (6:0.25:3)

(10) 5%pyrasulfotole suspension emulsion

(11) 3% mesosulfurons dispersible oil-suspending agent

(12) 75% tribenuron-methyl water dispersible granules

(13) blank

As shown in Table 6, the 43%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder pair of different ratio Common weed strain preventive effect between 85.74%～96.81%, be superior to comparison medicament 5%pyrasulfotole suspension emulsion, 3% Mesosulfuron dispersibles oil-suspending agent, (weeds strain preventive effect is respectively 46.28%, 59.13% to 75% tribenuron-methyl water dispersible granule With 44.91%).Wherein pyrasulfotole, mesosulfuron and tribenuron-methyl weight ratio are (0.75-6): (0.25-2): (0.375-3) there is obvious preventive effect to wheat paddock common weed when, weeds strain preventive effect is all more than 85%；Pyrasulfotole, first Base two sulphur is grand and tribenuron-methyl weight ratio is (1.5-4.5): (0.4-1.4): when (0.6-2) to wheat paddock common weed preventive effect relatively Good, weeds strain preventive effect is all more than 90%；And pyrasulfotole, mesosulfuron and tribenuron-methyl weight are than for 2.5:0.8:1 When preventive effect be more up to 96.81%.Thus illustrate, pyrasulfotole, mesosulfuron and tribenuron-methyl are in weight ratio (0.75- 6): (0.25-2): compounding in the range of (0.375-3), the weeds common to wheat paddock have preventive effect, and this herbicidal composition To Semen Tritici aestivi safety.

Eliminating weed in wheat field field control effectiveness test:

1st, test process

(1) 10%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder (2.5:0.8:1) 43g/ mu

(2) 43%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder (2.5:0.8:1) 10g/ mu

(3) 80%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder (2.5:0.8:1) 5.375g/ Mu

Test sets 3 process, 4 repetitions, totally 12 process cells, often processes 20 square metres of plot area, random district's groups Arrangement.(1)～(3) pyrasulfotole mesosulfuron tribenuron-methyl wettable powder is reagent agent, and every mu is watered 30 Kilogram, using 552 third type aerosol apparatus (0.7mm aperture) even spraying.Field main weeds have descurainia sophia (l.) webb ex prantl, Fructus Kochiae, Herba chenopodii, caput Grass, amur foxtail, wild oat.

2nd, pilot project and method

Herbicidal effect: every cell takes at random at 4 points, investigates 1/4 square metre at every, 30 days investigation weed control effects after dispenser Really, record weeds species and strain number respectively, calculate weeds strain preventive effect.

3rd, result of the test: herbicidal effect is shown in Table 7

30 days pyrasulfotole mesosulfuron tribenuron-methyls preventive effect to various weeds after table 7 medicine

Note: (1) 10%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder (2.5:0.8:1)

(2) 43%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder (2.5:0.8:1)

(3) 80%pyrasulfotole mesosulfuron tribenuron-methyl wettable powder (2.5:0.8:1)

As shown in Table 7, when the weight ratio of pyrasulfotole, mesosulfuron and tribenuron-methyl is during for 2.5:0.8:1, no With content pyrasulfotole mesosulfuron tribenuron-methyl wettable powder to common weed strain preventive effect all 96% with On, show pyrasulfotole, mesosulfuron and tribenuron-methyl weight ratio during for optimal proportion, different activities component content Herbicidal composition all has significant preventive effect to weeds.

In sum, instant component is reasonable, and activity when preventive effect is administered alone better than each component is mainly miscellaneous to wheat paddock Grass all has good preventive effect, expands control of weeds spectrum, has delayed the generation of herbicide resistance, to crop safety, met The security requirement of pesticidal preparations.

Claims (9)

1. it is characterised in that said composition is made up of tri- kinds of active component of a, b and c, wherein activity becomes a kind of herbicidal composition A is divided to be pyrasulfotole, active component b is mesosulfuron, active component c is tribenuron-methyl, described active component a, b and c Weight ratio be: (0.75-12): (0.25-4): (0.375-6).

2. herbicidal composition according to claim 1 is it is characterised in that the weight ratio of active component a, b and c is: (0.75-6): (0.25-2): (0.375-3).

3. herbicidal composition according to claim 2 is it is characterised in that the weight ratio of active component a, b and c is: (1.5-4.5): (0.4-1.4): (0.6-2).

4. herbicidal composition according to claim 3 is it is characterised in that the weight ratio of active component a, b and c is: (2- 3.5): (0.6-1.1): (0.8-1.5).

5. herbicidal composition according to claim 4 is it is characterised in that the weight ratio of active component a, b and c is: 2.5:0.8:1.

6. the preparation of herbicidal composition any one of 1-5 containing claim is it is characterised in that active component is in herbicide Weight percentage in compositionss is 5-85%.

7. preparation according to claim 6 is it is characterised in that described preparation can be any one agent agriculturally allowing Type.

8. preparation according to claim 7 is it is characterised in that described dosage form is wettable powder, water dispersible granules, suspension Agent or dispersible oil-suspending agent.

9. the herbicidal composition described in any one of claim 1-5 or the preparation described in any one of claim 6-8 are being prevented and kill off Application in weeds of wheat.