HERBICIDE COMPOSITION FOR LAWN
US20110245081A1
2011-10-06
13/157,416
2011-06-10
Abstract:
A herbicide composition for lawn characterized by containing iodosulfuron-methyl or its salt, and at least 1 kind of herbicidal compound selected from the group consisting of oxaziclomefone, fentrazamide, oxadiargyl, ethoxysulfuron, cafenstrole, indanofan, asulam, fenoxaprop, clethodim, ethofumesate, tribenuron-methyl, metsulfuron-methyl, thifensulfuron-methyl, bromoxynil, MCPA, 2,4-D, dicamba as effective components.
Inventors:
- HISATO SUZUKI 2 🇯🇵 Ibaraki, Japan
- Kiyoshi Taniguchi 2 🇯🇵 Ibaraki, Japan
- Kumiko Taniguchi 1 🇯🇵 Ibaraki, Japan
- Hikari Taniguchi 1 🇯🇵 Ibaraki, Japan
- Akane Taniguchi 1 🇯🇵 Ibaraki, Japan
- Kunio Kihara 2 🇯🇵 Ibaraki, Japan
Assignee:
- Bayer CropScience AG 961 🇩🇪 Monheim, Germany
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Classification:
A01N35/10 » CPC further
Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having two bonds to hetero atoms with at the most one bond to halogen, e.g. aldehyde radical at least one of the bonds to hetero atoms is to nitrogen containing a carbon-to-nitrogen double bond
A01N37/40 » CPC further
Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a singly bound oxygen or sulfur atom attached to the same carbon skeleton, this oxygen or sulfur atom not being a member of a carboxylic group or of a thio analogue, or of a derivative thereof, e.g. hydroxy-carboxylic acids having at least one oxygen or sulfur atom attached to an aromatic ring system having at least one carboxylic group or a thio analogue, or a derivative thereof, and one oxygen or sulfur atom attached to the same aromatic ring system
A01N39/04 » CPC further
Biocides, pest repellants or attractants, or plant growth regulators containing aryloxy- or arylthio-aliphatic or cycloaliphatic compounds, containing the group or , e.g. phenoxyethylamine, phenylthio-acetonitrile, phenoxyacetone; Aryloxy-carboxylic acids; Derivatives thereof Aryloxy-acetic acids; Derivatives thereof
A01N43/12 » CPC further
Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms with one hetero atom five-membered rings condensed with a carbocyclic ring
A01N43/20 » CPC further
Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms with one hetero atom three- or four-membered rings
A01N43/76 » CPC further
Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms five-membered rings with one nitrogen atom and either one oxygen atom or one sulfur atom in positions 1,3 1,3-Oxazoles; Hydrogenated 1,3-oxazoles
A01N43/82 » CPC further
Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms five-membered rings with three ring hetero atoms
A01N43/86 » CPC further
Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms six-membered rings with one nitrogen atom and either one oxygen atom or one sulfur atom in positions 1,3
A01N47/24 » CPC further
Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having one or more single bonds to nitrogen atoms; Carbamic acid derivatives, i.e. containing the group —O—CO—N<; Thio analogues thereof containing the groups , or; Thio analogues thereof
A01N47/38 » CPC further
Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having one or more single bonds to nitrogen atoms; Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N< containing the group >N—CO—N< where at least one nitrogen atom is part of a heterocyclic ring; Thio analogues thereof
A01N47/36 » CPC main
Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having one or more single bonds to nitrogen atoms; Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N< containing the group >N—CO—N< directly attached to at least one heterocyclic ring; Thio analogues thereof
A01N2300/00 » CPC further
Combinations or mixtures of active ingredients covered by classes - with other active or formulation relevant ingredients, e.g. specific carrier materials or surfactants, covered by classes -
A01N43/68 IPC
Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with three nitrogen atoms as the only ring hetero atoms 1,3,5-Triazines, not hydrogenated and not substituted at the ring nitrogen atoms with two or three nitrogen atoms directly attached to ring carbon atoms
Description
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation application of U.S. patent application Ser. No. 12/226,428, filed Oct. 13, 2009, which claims priority to PCT/EP2007/002883, filed Mar. 30, 2007, which claims priority to Japanese Application No. 2006-116578 filed Apr. 20, 2006. Each of these applications are incorporated by reference in their entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a herbicide composition for lawn. More specifically the present invention relates to a herbicide composition for lawn consisting of a combination of at least 2 kinds of specified herbicidal compounds.
2. Description of Related Art
- 4-Iodo-2-[3-(4-methoxy-6-methyl-1,3,5-triazin-2-yl)ureidosulfonyl]benzoic acid (common name: iodosulfuron-methyl),
- 3-[1-(3,5-dichlorophenyl)-1-methylethyl]-3,4-dihydro-6-methyl-5-phenyl-2H-1,3-oxazin-4-one (common name: oxaziclomefone),
- 4-(2-chlorophenyl)-N-cyclohexyl-N-ethyl-4,5-dihydro-5-oxo-1H-terazol-1-carboxamide (common name: fentrazamide),
- 5-tert-butyl-3-(2,4-dichloro-5-propargyloxyphenyl)-1,3,4-oxadiazol-2(3H)-one (common name: oxadiargyl),
- N,N-diethyl-3-meticylsulfonyl-1H-1,2,4-triazol-1-carboxamide (common name: cafenstrole),
- 1-(4,6-dimethoxypyrimidin-2-yl)-3-(2-ethoxyphenoxysulfonyl)urea (common name: ethoxysulfuron),
- (RS)-2-[2-(3-chlorophenyl)-2,3-epoxypropyl]-2-ethylindan-1,3-dione (common name: indanofan),
- methyl sulfanyl carbamate (common name: asulam)
- (±)-2-[4-(6-chloro-1,3-benzoxazol-2-yloxy)phenoxy]propionate; ethyl
- (±)-2-[4-(6-chlorobenzoxazol-2-yloxy)phenoxy]propionate (common name: fenoxaprop),
- (±)-2-[(E)-1-[(E)-3-chloroallyloxyimino]propyl]-5-[2-(ethylthio)propyl]-=3-hydroxycycl ohex-2-enone (common name: clethodim),
- (±)-2-ethoxy-2,3-dihydro-3,3-dimethylbenzofuran-5-yl methanesulfonate (common name: ethofumesate),
- methyl 2-[4-methoxy-6-methyl-1,3,5-triazin-(2-yl(methyl)carbamoylsulfamoyl]-benzoate (common name: tribenuron-methyl),
- methyl 2-(4-methoxy-6-methyl-1,3,5-triazin-2-ylcarbamoylsulfamoyl)benzoate (common name: metsulfuron-methyl),
- methyl 3-(4-methoy-6-methyl-1,3,5-triazin-1-ylcarbamoylsulfamoyl)thiophen-=2-carboxylate (common name: thifensulfuron-methyl),
- 3,5-dibromo-4-hydroxybenzonitrile; 3,5-dibromo-4-hydroxyphenyl cyanide (common name: bromoxynil),
- (4-chloro-2-methylphenoxy)acetic acid; 4-chloro-o-tolyloxyacetic acid (common name: MCPA),
- (2,4-dichlorophenoxy)acetic acid (common name: 2,4-D) and
- 3,6-dichloro-o-anisic acid (common name: dicamba), are known as herbicide (cf. The Pesticide Manual, 14th Edition, 2006, published by British Crop Protection Council).
Also a herbicide composition containing, for example, iodosulfuron-methyl and other herbicides for controlling rice weeds is known (cf. Japanese Laid-open Patent Publication No. 2002-520342).
Further, a mixed composition of at least 2 kinds of compounds selected from many known herbicides such as iodosulfuron-methyl, oxadiargyl, etc. is also known (cf. Japanese Laid-open Patent Publication No. 2005-502717).
SUMMARY OF THE INVENTION
In the lawn management for instance in a garden, golf course, public green areas, roadsides, etc., control of lawn weeds is the most important task for keeping views and good maintenance of golf course, etc. Up to now, however, there have been no satisfactory herbicides for lawn.
The present inventors found that the combination of the herbicidal compounds mentioned below shows an excellent and desirable effect in terms of weed controlling on the lawn and no or reduced phytotoxicity to the lawn and completed the present invention.
Thus, the present invention provides a herbicide for lawn characterized by combining
(a) iodosulfuron-methyl or its salt, and
(b) at least 1 kind of herbicidal compound selected from the group consisting of oxaziclomefone, fentrazamide, oxadiargyl, ethoxysulfuron, cafenstrole, indanofan, asulam, fenoxaprop, clethodim, ethofumesate, tribenuron-methyl, metsulfuron-methyl, thifensulfuron-methyl, bromoxynil, MCPA, 2,4-D and dicamba. In the present invention, the particularly preferable example of salt of iodosulfuron-methyl is the sodium salt.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
The herbicides (a) and (b) are referred to either by the “common name” according to the International Organization for Standardization (ISO) or by the chemical name, if appropriate together with a customary code number and in each case include all application forms, such as acids, salts, esters and isomers, such as stereoisomers and optical isomers.
Preferred herbicides (b) are oxaziclomefone, fentrazamide, oxadiargyl, ethoxysulfuron, cafenstrole, indanofan and asulam.
The combined herbicide of the present invention, preferably, shows a substantially higher herbicidal effect (synergistic effect) than the sum of the effect of each active compound by each single application, compared with the case that each active compound of the above-mentioned (a) and (b) is used each singly. As a result, in case of controlling weeds, it is possible to substantially reduce the concentration of each substance used by now. At the same time, the combined herbicide of the present invention shows excellent controlling effect against a wide range of weeds on the lawn and gives no or reduced phytotoxicity to lawn species such as cynodon spp, pasapalum notatum, zoysia spp., stenotaphrum americanum, axonopus spp., eremochloa optiuroides, pennisetum clandestinum, festuca rubra, festuca arundinacea, agrostis stolonifera, agrostis tenuis, poa pretense, lolium perenne. Consequently, the combined herbicide of the present invention can be applied as an excellent, selective herbicide for the lawn.
In the combined herbicide of the present invention, the usage ratio of a component (a) and a component (b) is not strictly restricted but can be varied in a relatively wide range according to the application time, application place, application method, etc. of said combined herbicide. Generally, a herbicidal compound as the component (b) can be used in the range of 0.001-1000 parts by weight, preferably 0.01-100 parts by weight to 1 part by weight of a component (a). More specifically, as for the preferred components (b), there can be used the amounts, for example, in the following ranges to 1 part by weight of iodosulfuron-methyl sodium salt as the component (a):
(b-1) oxaziclomefone: 2-15 parts by weight, preferably 5-10 parts by weight,
(b-2) fentrazamide: 50-110 parts by weight, preferably 60-100 parts by weight,
(b-3) oxadiargyl: 5-15 parts by weight, preferably 7-12 parts by weight,
(b-4) ethoxysulfuron: 3-12 parts by weight, preferably 5-9 parts by weight,
(b-5) cafenstrole: 70-150 parts by weight, preferably 90-130 parts by weight,
(b-6) indanofan: 30-80 parts by weight, preferably 40-70 parts by weight,
(b-7) asulam: 50-110 parts by weight, preferably 60-100 parts by weight.
The combined herbicide of the present invention can be used for controlling various kinds of weeds developing on the lawn.
As examples of the weeds to be controlled there can be mentioned the following:
Monocotyledonous weeds such as: Digitaria ciliayis (Retz.) Koeler, Eleusine indica (L.) Gaertn., Setaria viridis (L.) Beauv. var. viridis, Poa annua L., Alopecurus aequalis Sobol. var. amurensis, Imperata cylindrica (L.) Beau., Luzula capitata (Mig.) Mig, Cyperus rotundus L., Cyperus brevifolius (Rottb.) Hassk. var. leiolepis, Digitaria radicosa (Presl) Mig., Digitaria violascens Link), Setaria faberii Herrm, etc.
Dicotyledonous weeds such as: Rumex japonicus Houtt., Portulaca oleracea L. var. oleracea, Stellaria neglecta Weihe, Kummerowia striata (Thunb. ex Murray) Schindl., Euphorbia supina Rafin, Galinsoga ciliata (Rafin.) Blake, Cerastium glomeratum Thuill., Stellaria alsine Grimm. var undulata (Thunb. ex Murray) Ohwi, Cardamine flexuosa With., Capsella bursa-pastoris Medicus, Lamium amplexicaule L., Veronica persica Poir., Aster maaekii Regel, Oxalis comiculata L., Hydrocotyle sibthorpioides Lam., Plantago asiatica L., Plantago lanceolata L., Artemisia indica Willd. var. maximowiczii (Nakai) Hara, Erigeron philadelphicus L., Rumex acetosa L., Taraxacum officinale Weber, etc.
The use of the combined herbicide of the present invention, however, should not be restricted to these weeds in any way, but can be applied against other weeds in the same manner.
The combined herbicide of the present invention can be made into customary formulation forms in case of using for control of lawn weeds. As such formulation forms there can be mentioned, for example, solutions, emulsions, wettable powders, suspensions, water dispersible granules, powders, soluble powders, granules, suspo-emulsion concentrates, microcapsules in polymer substance, etc.
These formulations can be prepared by per se known methods. The formulations according to the present invention can be prepared, for example, by mixing the aforementioned components (a) and (b) with extenders, namely liquid diluents and/or solid diluents, and, in case of necessity, by using surfactants, namely emulsifiers and/or dispersants.
In case of using water as extender, for example, organic solvents can be used as auxiliary solvent. As liquid diluents there can be mentioned, for example, organic solvents such as aromatic hydrocarbons (for example, xylene, toluene, alkylnaphthalene, etc.), chlorinated aromatic or chlorinated aliphatic hydrocarbons (for example, chlorobenzenes, ethylene chlorides, methylene chloride, etc.), aliphatic hydrocarbons [for example, cyclohexane etc. or paraffins (for example, mineral oil fractions, mineral oils, vegetable oils, etc.)], alcohols (for example, butanol, glycols and their ethers, esters, etc.), ketones (for, example, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.), strongly polar solvents (for example, dimethylformamide, dimethyl sulfoxide, etc.), and water.
As solid diluents there can be mentioned, for example, ground natural minerals (for example, kaolin, clay, talc, chalk, quartz, attapulgite, montmorillonite, diatomaceous earth, etc.), ground synthetic minerals (for example, highly dispersed silicic acid, alumina, silicates, etc.) etc. As solid carriers for granules, for example, crushed and fractionated rocks (for example, calcite, marble, pumice, sepiolite, dolomite, etc.) synthetic granules of inorganic and organic meals, particles of organic materials (for example, saw dust, coconut shells, maize cobs, tobacco stalks, etc.) etc. can be used.
As surfactants there can be mentioned nonionic or anionic surfactants. As suitable nonionic surfactants there can be mentioned, for example, compounds obtained by addition polymerization of ethylene oxide to higher alcohols such as lauryl alcohol, stearyl alcohol, oleyl alcohol, etc.; compounds obtained by addition polymerization of ethylene oxide to alkylphenols such as isooctylphenol, nonylphenol, etc.; compounds obtained by addition polymerization of ethylene oxide to alkylnaphthols such as butylnaphthol, octylnaphthol, etc.; compounds obtained by addition polymerization of ethylene oxide to higher fatty acids such as palmitic acid, stearic acid, oleic acid, etc.; compounds obtained by addition polymerization of ethylene oxide to amines such as dodecylamine, stearic acid amine, etc.; higher fatty acid esters of polyhydric alcohols such as sorbitan etc. and compounds obtained by addition polymerization of ethylene oxide thereto; compounds obtained by block addition polymerization of ethylene oxide and propylene oxide, etc. As suitable anionic surfactants there can be mentioned, for example, alkyl sulfate salts such as sodium lauryl sulfate, amine salt of oleyl alcohol sulfuric acid ester, etc.; alkylsulfonic acid salts such as sodium dioctylsulfosuccinate, sodium 2-ethylhexenesulfonate, etc.; arylsulfonic acid salts such as sodium isopropyl-naphthalenesulfonate, sodium methylenebis-naphthalenesulfonate, sodium lignin-sulfonate, sodium dodecylbenezenesulfonate, etc.
As dispersants, for example, lignin sulfite waste liquor or methyl cellulose are suitable.
Tackifiers can also be used in formulations (powders, granules, emulsifiable concentrates). As said tackifiers there can be mentioned, for example, carboxymethyl cellulose, natural and synthetic polymers (for example, gum Arabic, polyvinyl alcohol, polyvinyl acetates, etc.) natural phospholipids (for example, cephalins or recithins), synthetic phospholipids, etc. Further, as additives, mineral oils or vegetable oils can be used.
Colorants can also be used. As said colorants there can be mentioned inorganic pigments (for example, iron oxide, titanium oxide, Prussian Blue, etc,), organic dyestuffs such as alizarin dyestuffs, azo dyestuffs or metal phthalocyanine dyestuffs, and further traces nutrients such as salts of metals such as iron, manganese, boron, copper, cobalt, molybdenum, zinc, etc.
The formulations can contain the total of the aforementioned components (a) and (b) constituting the herbicide of the present invention at a concentration in the range of generally 0.1-95% by weight, preferably 0.5-90% by weight.
The herbicide of the present invention can be used for controlling weeds as themselves or in their formulation forms. It is also possible to do tank mixing at the time of usage and further to use together with other known active compounds, for example, other herbicides, safeners, fungicides, insecticides, plant growth regulators, plant nutrients or soil improving agents.
The herbicide of the present invention can be used as such or in their formulation forms or in application forms prepared by further diluting said formulations, for example, in the forms of ready-to-use solutions, emulsifiable concentrates, suspensions, powders, wettable powders, granules, etc. Formulations of these forms can be applied to lawn growing area by usual methods, for example, watering, spraying, atomizing, dusting, granule spreading, etc.
The application amount of the herbicide of the present invention can be varied in a substantial range according to, for example, the weeds to be controlled, application time, soil conditions, formulation form, etc. The application amount can be in the range of, for example, 0.0005 kg-50 kg/ha, preferably 0.001 kg-5 kg/ha as the total amount of the effective components of the components (a) and (b).
The herbicide of the present invention can be applied not only in the form of a mixed formulation containing the components (a) and (b) as mentioned above but also in the form of a single formulation of each component (a) and (b) simultaneously, continuously or successively.
The herbicide of the present invention shows, as shown in the below-mentioned test examples, a precise controlling effect against various kinds of lawn weeds and shows an excellent residual effect.
Excellent effect of the herbicide of the present invention will be described more specifically by the following examples. The present invention, however, should not be restricted only to them in any way. In the examples the component (a) and components (b-1)-(b-7) are defined as aforementioned.
EXAMPLES
Formulation Examples
Example 1
Flowable
| Component (a) | 1.7% | by weight | |
| Component (b-1) | 15.0% | by weight | |
| Polyoxyethylene nonyl phenyl ether | 2.0% | by weight | |
| Sodium dioctylsulfosuccinate | 2.0% | by weight | |
| Xanthan gum | 0.2% | by weight | |
| Water | 79.1% | by weight | |
The above-mentioned components are wet crushed with a wet ball mill to obtain a flowable.
Example 2
Granule
| Component (a) | 1.7% | by weight | |
| Component (b-1) | 15.0% | by weight | |
| Sodium ligninsulfonate | 3.0% | by weight | |
| Sodium alkylnaphthalenesulfonate | 1.0% | by weight | |
| Bentonite | 30.0% | by weight | |
| Talc | 49.3% | by weight | |
After the above-mentioned components have been mixed and crushed, the mixture is granulated by a usual method with a granulator and dried to obtain granules.
Example 3
Wettable Powder
| Component (a) | 1.7% | by weight | |
| Component (b-1) | 15.0% | by weight | |
| Sodium ligninsulfonate | 3.0% | by weight | |
| Sodium dialkyl naphthalenesulfonate | 3.0% | by weight | |
| Kaolin | 77.3% | by weight | |
The above-mentioned components are mixed, crushed and homogenized to obtain a wettable powder.
Example 4
Flowable
| Component (a) | 0.34% | by weight | |
| Component (b-2) | 30.0% | by weight | |
| Polyoxyethylene nonyl phenyl ether | 2.0% | by weight | |
| Sodium dioctylsulfosuccinate | 2.0% | by weight | |
| Xanthan gum | 0.2% | by weight | |
| Water | 65.46% | by weight | |
The above-mentioned components are wet crushed with a wet ball mill to obtain a flowable.
Example 5
Granule
| Component (a) | 0.17% | by weight | |
| Component (b-2) | 15.0% | by weight | |
| Sodium ligninsulfonate | 3.0% | by weight | |
| Sodium alkylnaphthalenesulfonate | 1.0% | by weight | |
| Bentonite | 30.0% | by weight | |
| Talc | 50.83% | by weight | |
After the above-mentioned components have been mixed and crushed, the mixture is granulated by a usual method with a granulator and dried to obtain granules.
Example 6
Wettable Powder
| Component (a) | 0.34% | by weight | |
| Component (b-2) | 30.0% | by weight | |
| Sodium ligninsulfonate | 3.0% | by weight | |
| Sodium dialkyl naphthalenesulfonate | 3.0% | by weight | |
| Kaolin | 63.66% | by weight | |
The above-mentioned components are mixed, crushed and homogenized to obtain a wettable powder.
Example 7
Flowable
| Component (a) | 1.7% | by weight | |
| Component (b-3) | 17.0% | by weight | |
| Polyoxyethylene nonyl phenyl ether | 2.0% | by weight | |
| Sodium dioctylsulfosuccinate | 2.0% | by weight | |
| Xanthan gum | 0.2% | by weight | |
| Water | 77.1% | by weight | |
The above-mentioned components are wet crushed with a wet ball mill to obtain a flowable.
Example 8
Granule
| Component (a) | 1.7% | by weight | |
| Component (b-3) | 17.0% | by weight | |
| Sodium ligninsulfonate | 3.0% | by weight | |
| Sodium alkylnaphthalenesulfonate | 1.0% | by weight | |
| Bentonite | 30.0% | by weight | |
| Talc | 47.3% | by weight | |
After the above-mentioned components have been mixed and crushed, the mixture is granulated by a usual method with a granulator and dried to obtain granules.
Example 9
Wettable Powder
| Component (a) | 1.7% | by weight | |
| Component (b-3) | 17.0% | by weight | |
| Sodium ligninsulfonate | 3.0% | by weight | |
| Sodium dialkyl naphthalenesulfonate | 3.0% | by weight | |
| Kaolin | 75.3% | by weight | |
The above-mentioned components are mixed, crushed and homogenized to obtain a wettable powder.
Example 10
Flowable
| Component (a) | 1.7% | by weight | |
| Component (b-4) | 12.5% | by weight | |
| Polyoxyethylene nonyl phenyl ether | 2.0% | by weight | |
| Sodium dioctylsulfosuccinate | 2.0% | by weight | |
| Xanthan gum | 0.2% | by weight | |
| Water | 81.6% | by weight | |
The above-mentioned components are wet crushed with a wet ball mill to obtain a flowable.
Example 11
Granule
| Component (a) | 1.7% | by weight | |
| Component (b-4) | 12.5% | by weight | |
| Sodium ligninsulfonate | 3.0% | by weight | |
| Sodium alkylnaphthalenesulfonate | 1.0% | by weight | |
| Bentonite | 30.0% | by weight | |
| Talc | 51.8% | by weight | |
After the above-mentioned components have been mixed and crushed, the mixture is granulated by a usual method with a granulator and dried to obtain granules.
Example 12
Wettable Powder
| Component (a) | 1.7% | by weight | |
| Component (b-4) | 12.5% | by weight | |
| Sodium ligninsulfonate | 3.0% | by weight | |
| Sodium dialkyl naphthalenesulfonate | 3.0% | by weight | |
| Kaolin | 79.8% | by weight | |
The above-mentioned components are mixed, crushed and homogenized to obtain a wettable powder.
Example 13
Flowable
| Component (a) | 0.34% | by weight | |
| Component (b-5) | 40.0% | by weight | |
| Polyoxyethylene nonyl phenyl ether | 2.0% | by weight | |
| Sodium dioctylsulfosuccinate | 2.0% | by weight | |
| Xanthan gum | 0.2% | by weight | |
| Water | 55.46% | by weight | |
The above-mentioned components are wet crushed with a wet ball mill to obtain a flowable.
Example 14
Granule
| Component (a) | 0.17% | by weight | |
| Component (b-5) | 20.0% | by weight | |
| Sodium ligninsulfonate | 3.0% | by weight | |
| Sodium alkylnaphthalenesulfonate | 1.0% | by weight | |
| Bentonite | 30.0% | by weight | |
| Talc | 45.83% | by weight | |
After the above-mentioned components have been mixed and crushed, the mixture is granulated by a usual method with a granulator and dried to obtain granules.
Example 15
Wettable Powder
| Component (a) | 0.34% | by weight | |
| Component (b-5) | 40.0% | by weight | |
| Sodium ligninsulfonate | 3.0% | by weight | |
| Sodium dialkyl naphthalenesulfonate | 3.0% | by weight | |
| Kaolin | 53.66% | by weight | |
The above-mentioned components are mixed, crushed and homogenized to obtain a wettable powder.
Example 16
Flowable
| Component (a) | 0.34% | by weight | |
| Component (b-6) | 20.0% | by weight | |
| Polyoxyethylene nonyl phenyl ether | 2.0% | by weight | |
| Sodium dioctylsulfosuccinate | 2.0% | by weight | |
| Xanthan gum | 0.2% | by weight | |
| Water | 75.46% | by weight | |
The above-mentioned components are wet crushed with a wet ball mill to obtain a flowable.
Example 17
Granule
| Component (a) | 0.34% | by weight | |
| Component (b-6) | 20.0% | by weight | |
| Sodium ligninsulfonate | 3.0% | by weight | |
| Sodium alkylnaphthalenesulfonate | 1.0% | by weight | |
| Bentonite | 30.0% | by weight | |
| Talc | 45.66% | by weight | |
After the above-mentioned components have been mixed and crushed, the mixture is granulated by a usual method with a granulator and dried to obtain granules.
Example 18
Wettable Powder
| Component (a) | 0.34% | by weight | |
| Component (b-6) | 20.0% | by weight | |
| Sodium ligninsulfonate | 3.0% | by weight | |
| Sodium dialkyl naphthalenesulfonate | 3.0% | by weight | |
| Kaolin | 73.66% | by weight | |
The above-mentioned components are mixed, crushed and homogenized to obtain a wettable powder.
Example 19
Flowable
| Component (a) | 0.34% | by weight | |
| Component (b-7) | 30.0% | by weight | |
| Polyoxyethylene nonyl phenyl ether | 2.0% | by weight | |
| Sodium dioctylsulfosuccinate | 2.0% | by weight | |
| Xanthan gum | 0.2% | by weight | |
| Water | 65.46% | by weight | |
The above-mentioned components are wet crushed with a wet ball mill to obtain a flowable.
Example 20
Granule
| Component (a) | 0.34% | by weight | |
| Component (b-7) | 30.0% | by weight | |
| Sodium ligninsulfonate | 3.0% | by weight | |
| Sodium alkylnaphthalenesulfonate | 1.0% | by weight | |
| Bentonite | 30.0% | by weight | |
| Talc | 35.66% | by weight | |
After the above-mentioned components have been mixed and crushed, the mixture is granulated by a usual method with a granulator and dried to obtain granules.
Example 21
Wettable Powder
| Component (a) | 0.34% | by weight | |
| Component (b-7) | 30.0% | by weight | |
| Sodium ligninsulfonate | 3.0% | by weight | |
| Sodium dialkyl naphthalenesulfonate | 3.0% | by weight | |
| Kaolin | 63.66% | by weight | |
The above-mentioned components are mixed, crushed and homogenized to obtain a wettable powder.
Biological Examples
Test Example 1
The Agent Amount Reduction Effect and Herbicidal Effect Enhancing Action of the Soil Treatment by Mixing
On a field of Zoysia japonica sectioned to 100 cm×100 cm, seeds of Digitaria ciliayis (Retz.) Koeler, Poa annua L., Polygonum hydropiper L., Euphorbia supine Rafin, Oxalis comiculata L., Cyperus microiria were sown and covered with 0.5 cm soil. Seven days after weeds sowing, treatment was conducted with watering amount of 200 cc/m2. The prescribed amount of test compound was sprayed with a small spray in the form of the formulation prepared according to the above-mentioned examples or a wettable powder of a single compound diluted with water.
The herbicidal effect and the degree of phytotoxicity to the lawn were studied 45 days after the agent treatment. The results are shown in Table 1-Table 7.
Evaluation Standard:
Herbicidal effect: 100%: complete death 0%: no effect
Phytotoxicity: 100%: complete death 0%: no phytotoxicity
In the tables, ai means the effective component.
| TABLE 1 | |||
| Effective component | |||
| amount g ai/ha | Herbicidal effect |
| Iodosulfuron | Digitaria | ||||||||
| methyl | ciliayis | Oxalis | Zoysia | ||||||
| sodium | (Retz.) | Poa | Polygonum | Erigeron | corniculata | Chenopodium | matrella | ||
| Test agent | salt | Oxaziclomefone | Koeler | annua L. | blumei | canadensis | L. | ficifolium | phytotoxicity |
| Iodosulfuron | 17 | — | 60 | 60 | 100 | 75 | 70 | 80 | 0 |
| methyl sodium | |||||||||
| salt | |||||||||
| Oxaziclomefone | — | 150 | 90 | 90 | 0 | 0 | 0 | 0 | 0 |
| Herbicide of the | 8.5 | 75 | 95 | 100 | 100 | 100 | 100 | 100 | 0 |
| present | 17 | 150 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| invention | 25.5 | 225 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| No treatment | — | — | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| TABLE 2 | |||
| Effective component | |||
| amount g ai/ha | Herbicidal effect |
| Iodosulfuron | Digitaria | ||||||||
| methyl | ciliayis | Zoysia | |||||||
| sodium | (Retz.) | Poa | Polygonum | Erigeron | Oxalis | Chenopodium | matrella | ||
| Test agent | salt | Fentrazamide | Koeler | annua L. | blumei | canadensis | corniculata L. | ficifolium | phytotoxicity |
| Iodosulfuron | 17 | — | 60 | 60 | 100 | 75 | 70 | 80 | 0 |
| methyl sodium | |||||||||
| salt | |||||||||
| Fentrazamide | — | 1500 | 90 | 80 | 0 | 0 | 0 | 20 | 0 |
| Herbicide of the | 8.5 | 750 | 95 | 100 | 100 | 100 | 100 | 100 | 0 |
| present | 17 | 1500 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| invention | 25.5 | 2250 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| No treatment | — | — | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| TABLE 3 | |||
| Effective component amount | Herbicidal effect |
| g ai/ha | Digitaria |
| Iodosulfuron | ciliayis | Zoysia | |||||||
| methyl sodium | (Retz.) | Poa | Polygonum | Erigeron | Oxalis | Chenopodium | matrella | ||
| Test agent | salt | Oxadiargyl | Koeler | annua L. | blumei | canadensis | corniculata L. | ficifolium | phytotoxicity |
| Iodosulfuron | 17 | — | 60 | 60 | 100 | 75 | 70 | 80 | 0 |
| methyl sodium | |||||||||
| salt | |||||||||
| Oxadiargyl | — | 170 | 70 | 70 | 40 | 20 | 20 | 50 | 0 |
| Herbicide of the | 8.5 | 85 | 98 | 100 | 100 | 100 | 100 | 100 | 0 |
| present | 17 | 170 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| invention | 25.5 | 225 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| No treatment | — | — | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| TABLE 4 | |||
| Effective component amount | Herbicidal effect |
| g ai/ha | Digitaria |
| Iodosulfuron | ciliayis | Oxalis | Zoysia | ||||||
| methyl sodium | (Retz.) | Poa | Polygonum | Erigeron | corniculata | Chenopodium | matrella | ||
| Test agent | salt | Ethoxysulfuron | Koeler | annua L. | blumei | canadensis | L. | ficifolium | phytotoxicity |
| Iodosulfuron | 17 | — | 60 | 60 | 100 | 75 | 70 | 80 | 0 |
| methyl sodium | |||||||||
| salt | |||||||||
| Ethoxysulfuron | — | 125 | 0 | 0 | 60 | 75 | 50 | 70 | 0 |
| Herbicide of the | 8.5 | 62.5 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| present | 17 | 120 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| invention | 25.5 | 182.5 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| No treatment | — | — | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| TABLE 5 | |||
| Effective component amount | Herbicidal effect |
| g ai/ha | Digitaria |
| Iodosulfuron | ciliayis | Zoysia | |||||||
| methyl sodium | (Retz.) | Poa | Polygonum | Erigeron | Oxalis | Chenopodium | matrella | ||
| Test agent | salt | Cafenstrole | Koeler | annua L. | blumei | canadensis | corniculata L. | ficifolium | phytotoxicity |
| Iodosulfuron | 17 | — | 60 | 60 | 100 | 75 | 70 | 80 | 0 |
| methyl sodium | |||||||||
| salt | |||||||||
| Cafenstrole | — | 2000 | 0 | 0 | 60 | 75 | 50 | 70 | 0 |
| Herbicide of the | 8.5 | 1000 | 80 | 80 | 100 | 100 | 100 | 100 | 0 |
| present | 17 | 2000 | 100 | 95 | 100 | 100 | 100 | 100 | 0 |
| invention | 25.5 | 3000 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| No treatment | — | — | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| TABLE 6 | |||
| Effective component | Herbicidal effect |
| amount g ai/ha | Digitaria |
| Iodosulfuron | ciliayis | ||||||||
| methyl sodium | (Retz.) | Poa | Polygonum | Erigeron | Oxalis | Chenopodium | Zoysia matrella | ||
| Test agent | salt | Indanofan | Koeler | annua L. | blumei | canadensis | corniculata L. | ficifolium | phytotoxicity |
| Iodosulfuron | 17 | — | 60 | 60 | 100 | 75 | 70 | 80 | 0 |
| methyl sodium | |||||||||
| salt | |||||||||
| Indanofan | — | 1000 | 0 | 0 | 60 | 75 | 50 | 70 | 0 |
| Herbicide of the | 8.5 | 500 | 80 | 80 | 100 | 100 | 100 | 100 | 0 |
| present | 17 | 1000 | 90 | 90 | 100 | 100 | 100 | 100 | 0 |
| invention | 25.5 | 1500 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| No treatment | — | — | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| TABLE 7 | |||
| Effective component | Herbicidal effect |
| amount g ai/ha | Digitaria |
| Iodosulfuron | ciliayis | Poa | Oxalis | Zoysia | |||||
| methyl | (Retz.) | annua | Polygonum | Erigeron | corniculata | Chenopodium | matrella | ||
| Test agent | sodium salt | Asulam | Koeler | L. | blumei | canadensis | L. | ficifolium | phytotoxicity |
| Iodosulfuron | 17 | — | 40 | 50 | 80 | 75 | 50 | 70 | 0 |
| methyl sodium | |||||||||
| salt | |||||||||
| Asulam | — | 1500 | 20 | 20 | 0 | 0 | 0 | 0 | 0 |
| Herbicide of the | 8.5 | 750 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| present | 17 | 1500 | 95 | 100 | 100 | 100 | 100 | 100 | 0 |
| invention | 25.5 | 2250 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| No treatment | — | ( | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Test Example 2
The Agent Amount Reduction Effect and Herbicidal Effect Enhancing Action of the Foliage and Soil Treatment by Mixing
A test section of Zoysia matrella had been prepared in the same method as in the Test Example 1 and on the 28th day after weeds sowing a treatment was conducted with watering amount of 200 cc/m2. The prescribed amount of test compound was sprayed with a small spray in the form of the formulation prepared according to the aforementioned examples or a wettable powder of a single compound diluted with water.
The herbicidal effect and the degree of phytotoxicity to the lawn were studied 45 days after the agent treatment in the same manner as Test Example 1. The results are shown in Table 8-Table 14.
| TABLE 8 | |||
| Effective component amount | Herbicidal effect |
| g ai/ha | Digitaria |
| Iodosulfuron | ciliayis | Poa | Zoysia | ||||||
| methyl | (Retz.) | annua | Polygonum | Erigeron | Oxalis | Chenopodium | matrella | ||
| Test agent | sodium salt | Oxaziclomefone | Koeler | L. | blumei | canadensis | corniculata L. | ficifolium | phytotoxicity |
| Iodosulfuron | 17 | — | 40 | 50 | 80 | 75 | 50 | 70 | 0 |
| methyl sodium | |||||||||
| salt | |||||||||
| Oxaziclomefone | — | 150 | 30 | 30 | 0 | 0 | 0 | 0 | 0 |
| Herbicide of the | 8.5 | 75 | 90 | 95 | 100 | 90 | 90 | 100 | 0 |
| present | 17 | 150 | 95 | 100 | 100 | 100 | 100 | 100 | 0 |
| invention | 25.5 | 225 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| No treatment | — | — | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| TABLE 9 | |||
| Effective component amount | Herbicidal effect |
| g ai/ha | Digitaria |
| Iodosulfuron | ciliayis | Oxalis | Zoysia | ||||||
| methyl sodium | (Retz.) | Poa | Polygonum | Erigeron | corniculata | Chenopodium | matrella | ||
| Test agent | salt | Fentrazamide | Koeler | annua L. | blumei | canadensis | L. | ficifolium | phytotoxicity |
| Iodosulfuron | 17 | — | 40 | 50 | 80 | 75 | 50 | 70 | 0 |
| methyl sodium | |||||||||
| salt | |||||||||
| Fentrazamide | — | 1500 | 40 | 30 | 0 | 0 | 0 | 0 | 0 |
| Herbicide of the | 8.5 | 750 | 90 | 90 | 100 | 90 | 90 | 100 | 0 |
| present | 17 | 1500 | 95 | 100 | 100 | 100 | 100 | 100 | 0 |
| invention | 25.5 | 2250 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| No treatment | — | — | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| TABLE 10 | |||
| Effective component | Herbicidal effect |
| amount ai/ha | Digitaria |
| Iodosulfuron | ciliayis | Zoysia | |||||||
| methyl sodium | (Retz.) | Poa | Polygonum | Erigeron | Oxalis | Chenopodium | matrella | ||
| Test agent | salt | Oxadiargyl | Koeler | annua L. | blumei | canadensis | corniculata L. | ficifolium | phytotoxicity |
| Iodosulfuron | 17 | — | 40 | 50 | 80 | 75 | 50 | 70 | 0 |
| methyl sodium | |||||||||
| salt | |||||||||
| Oxadiargyl | — | 170 | 40 | 30 | 20 | 20 | 0 | 30 | 0 |
| Herbicide of the | 8.5 | 85 | 90 | 90 | 90 | 90 | 90 | 100 | 0 |
| present | 17 | 170 | 100 | 95 | 100 | 100 | 100 | 100 | 0 |
| invention | 25.5 | 225 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| No treatment | — | — | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| TABLE 11 | |||
| Effective component amount | Herbicidal effect |
| g ai/ha | Digitaria |
| Iodosulfuron | ciliayis | Oxalis | Zoysia | ||||||
| methyl sodium | (Retz.) | Poa | Polygonum | Erigeron | corniculata | Chenopodium | matrella | ||
| Test agent | salt | Ethoxysulfuron | Koeler | annua L. | blumei | canadensis | L. | ficifolium | phytotoxicity |
| Iodosulfuron | 17 | — | 40 | 50 | 80 | 75 | 50 | 70 | 0 |
| methyl sodium | |||||||||
| salt | |||||||||
| Ethoxysulfuron | — | 125 | 0 | 0 | 40 | 60 | 30 | 50 | 0 |
| Herbicide of the | 8.5 | 62.5 | 90 | 90 | 95 | 100 | 100 | 100 | 0 |
| present | 17 | 120 | 100 | 95 | 100 | 100 | 100 | 100 | 0 |
| invention | 25.5 | 182.5 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| No treatment | — | — | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| TABLE 12 | |||
| Effective component amount | Herbicidal effect |
| g ai/ha | Digitaria |
| Iodosulfuron | ciliayis | Zoysia | |||||||
| methyl sodium | (Retz.) | Poa | Polygonum | Erigeron | Oxalis | Chenopodium | matrella | ||
| Test agent | salt | Cafenstrole | Koeler | annua L. | blumei | canadensis | corniculata L. | ficifolium | phytotoxicity |
| Iodosulfuron | 17 | — | 40 | 50 | 80 | 75 | 50 | 70 | 0 |
| methyl sodium | |||||||||
| salt | |||||||||
| Cafenstrole | — | 2000 | 40 | 30 | 0 | 0 | 0 | 20 | 0 |
| Herbicide of the | 8.5 | 1000 | 80 | 80 | 90 | 90 | 90 | 90 | 0 |
| present | 17 | 2000 | 100 | 95 | 100 | 100 | 100 | 100 | 0 |
| invention | 25.5 | 3000 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| No treatment | — | — | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| TABLE 13 | |||
| Effective component | |||
| amount g ai/ha | Herbicidal effect |
| Iodosulfuron | Digitaria | Zoysia | |||||||
| methyl | ciliayis | Poa | Polygonum | Erigeron | Oxalis | Chenopodium | matrella | ||
| Test agent | sodium salt | Indanofan | (Retz.) Koeler | annua L. | blumei | canadensis | corniculata L. | ficifolium | phytotoxicity |
| Iodosulfuron | 17 | — | 40 | 50 | 80 | 75 | 50 | 70 | 0 |
| methyl sodium | |||||||||
| salt | |||||||||
| Indanofan | — | 1000 | 30 | 30 | 0 | 0 | 0 | 20 | 0 |
| Herbicide of the | 8.5 | 500 | 80 | 80 | 90 | 80 | 90 | 90 | 0 |
| present | 17 | 1000 | 90 | 90 | 100 | 100 | 100 | 100 | 0 |
| invention | 25.5 | 1500 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| No treatment | — | — | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| TABLE 14 | |||
| Effective component | Herbicidal effect |
| amount g ai/ha | Digitaria |
| Iodosulfuron | ciliayis | Poa | Oxalis | Zoysia | |||||
| methyl | (Retz.) | annua | Polygonum | Erigeron | corniculata | Chenopodium | matrella | ||
| Test agent | sodium salt | Asulam | Koeler | L. | blumei | canadensis | L. | ficifolium | phytotoxicity |
| Iodosulfuron | 17 | — | 40 | 50 | 80 | 75 | 50 | 70 | 0 |
| methyl sodium | |||||||||
| salt | |||||||||
| Asulam | — | 1500 | 40 | 30 | 70 | 60 | 60 | 60 | 0 |
| Herbicide of the | 8.5 | 750 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| present | 17 | 1500 | 100 | 100 | 100 | 100 | 100 | 0 | |
| invention | 25.5 | 2250 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| No treatment | — | — | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Claims
1. A method for controlling a weed comprising applying
(a) iodosulfuron-methyl or a salt thereof, and
(b) fenoxaprop.
2. The method of claim 1, wherein said iodosulfuron-methyl or a salt thereof is iodosulfuron-methyl sodium salt.
3. The method of claim 1, wherein components (a) and (b) are applied in a range from 0.001 kg-5 kg/ha as the total amount of said components of (a) and (b).
4. The method of claim 1, wherein components (a) and (b) are applied in a mixed formulation comprising said components of (a) and (b).
5. The method of claim 1, wherein components (a) and (b) are applied in a single formulation of each component (a) and (b).
6. The method of claim 1, wherein components (a) and (b) are applied simultaneously.
7. The method of claim 1, wherein components (a) and (b) are applied continuously.
8. The method of claim 1, wherein components (a) and (b) are applied successively.
9. The method of claim 1, wherein components (a) and (b) are applied to lawn.
10. The method of claim 1, wherein said weed is selected from the group consisting of Digitaria ciliayis Koeler, Eleusine indica Gaertn., Setaria viridis Beauv. var. viridis, Poa annua L., Alopecurus aequalis Sobol. var amurensis, Imperata cylindrica Beau., Luzula capitata Mig, Cyperus rotundus L., Cyperus brevifolius Hassk. var. leiolepis, Digitaria radicosa Mig., Digitaria violascens, Setaria faberii Herrm, Rumex japonicus Houtt., Portulaca oleracea L. var. oleracea, Stellaria neglecta Weihe, Kummerowia striata Schindl., Euphorbia supina Rafin, Galinsoga ciliata Blake, Cerastium glomeratum Thuill., Stellaria alsine Grimm. var. undulata Ohwi, Cardamine flexuosa With., Capsella bursa-pastoris Medicus, Lamium amplexicaule L., Veronica persica Poir., Aster maaekii Regel, Oxalis corniculata L., Hydrocotyle sibthorpioides Lam., Plantago asiatica L., Plantago lanceolata L., Artemisia indica Willd. var. maximowiczii Hara, Erigeron philadelphicus L., Rumex acetosa L., and Taraxacum officinale Weber.
11. The method of claim 1, wherein components (a) and (b) exhibit a synergistic effect.
12. The method of claim 1, wherein components (a) and (b) are present in a ratio of 1:0.01-100 part by weight of components (a) to (b).
13. A composition for controlling weeds comprising
(a) iodosulfuron-methyl or a salt thereof, and
(b) fenoxaprop.
14. The composition of claim 13, wherein said iodosulfuron-methyl or a salt thereof is iodosulfuron-methyl sodium salt.
15. The composition of claim 13, wherein components (a) and (b) exhibit a synergistic effect.
16. The composition of claim 13, wherein components (a) and (b) are present in a ratio of 1:0.01-100 part by weight of components (a) to (b).
17. The composition of claim 13, further comprising an extender.
18. The composition of claim 17, wherein said extender is a diluent, surfactant, emulsifier, and/or dispersant.
19. A method of preparing a composition for controlling weeds comprising mixing
(a) iodosulfuron-methyl or a salt thereof,
(b) fenoxaprop; and
(c) an extender.
20. The method of preparing a composition of claim 19, wherein said composition is in the form of a ready-to-use solution, emulsifiable concentrate, suspension, powders, wettable powder, or granules.