Patent Application
20080171660
The present invention relates to a method of controlling weeds in small grain cereals.
Efficient weed control in small-grain cereals such as wheat, oat, barley or rye is of great economic importance.
Phenyluracils are known to be useful herbicides. WO 04/080183 discloses combinations of said phenyluracils with certain other herbicides having increased herbicidal activity and improved compatibility with useful plants. The use of herbicidal phenyluracils as desiccants and/or defoliants is disclosed in WO 01/83459. Furthermore, it is known from WO 03/24221 that combinations comprising phenyluracils of formula I
in which the variables R1-R7 are as defined below:
Tribenuron is selective in small-grain cereals. At higher use rates phenyluracils have phytotoxity in small-grain cereals. In view of their synergistically enhanced activity with ALS inhibitors one would expect an even higher phytotoxity when using a combination of phenyluracils with tribenuron.
Surprisingly, it has now been found that phenyluracils or agriculturally acceptable salts thereof, in combination with tribenuron exhibit reduced phytotoxity in small grain cereal crops. Thus, tribenuron has a crop specific safening effect on phenyluracils of formula I.
The present invention therefore relates to a method of controlling weeds in crops selected from small grain cereals which comprises allowing an herbicidally effective amount of a combination of 3-phenyluracil of formula I (component A)
wherein the variables R1 to R7 are as defined below:
Habitat means the living space of the plants.
The organic moieties mentioned in the definition of the substituents R2, R5, R6, R7 in formula I are—like the term halogen—collective terms for individual enumerations of the individual group members. All hydrocarbon chains, i.e. all alkyl, haloalkyl, cycloalkyl, alkoxy, cycloalkenyl, alkenyl and alkynyl groups can be straight-chain or branched, the prefix Cn-Cm denoting in each case the possible number of carbon atoms in the group. Halogenated substituents preferably carry one, two, three, four or five identical or different halogen atoms. The term halogen denotes in each case fluorine, chlorine, bromine or iodine.
Examples of such meanings are:
One or more 3-phenyluracils may be used.
Among the 3-phenyluracils of formula I, preference is given to those wherein the variables R1 to R7 independently of one another, have the meanings given below:
A particularly preferred embodiment of the invention comprises the use of at least one 3-phenyluracil I in which the variables R1 to R7 in formula I have the following meanings (hereinbelow also referred to as phenyluracils Ia):
Another particularly preferred embodiment of the invention comprises the use at least one 3-phenyluracil I in which the variables R1 to R7 in formula I have the meanings below (hereinbelow also referred to as phenyluracils Ib):
Examples of particularly preferred herbicides Ia or Ib are the 3-phenyluracils of the formula I′ listed below wherein R1, R6 and R7 have the meanings given in one row of table 1 (compounds I.1 to I.74).
Compounds I.1, I.3, I.5, I.7, I.9, I.11 and I.13 are particularly preferred.
Component B may be tribenuron, an agriculturally acceptable derivative thereof, an agriculturally acceptable salt of tribenuron or an agriculturally acceptable salt of said derivative. Suitable derivatives and salts are illustrated below.
Preferably, component B is selected from tribenuron, a C1-C10-alkylester thereof, an agriculturally acceptable salt of tribenuron or an agriculturally acceptable salt of said ester. The particularly preferred component B is tribenuron, tribenuron-methyl or an agriculturally acceptable salt thereof.
The combination of the 3-phenyluracils of formula I with component B may be used in combination with at least one (one or more) other herbicide (component C) or an agriculturally acceptable salt or derivative (provided the herbicide has a carboxyl group) thereof. The herbicides C are selected from the following classes c1) to c15):
Preferred herbicides of groups c1) to c15) are the compounds listed below:
Most preferred herbicides are those of groups c1), c2), c3) and c13) in particular the compounds listed below:
Tribenuron and the herbicides C of groups c1) to c15) are known herbicides, see the quoted literature references and, for example, The Compendium of Pesticide Common Names (http://www.hclrss.demon.co.uk/index.html); Farm Chemicals Handbook 2000 Vol. 86, Meister Publishing Company, 2000; B. Hock, C. Fedtke, R. R. Schmidt, Herbizide, Georg Thieme Verlag, Stuttgart 1995; W. H. Ahrens, Herbicide Handbook, 7th Edition, Weed Science Society of America, 1994; and K. K. Hatzios, Herbicide Hand-book, Supplement to 7th Edition, Weed Science Society of America, 1998. 2,2,5-Trimethyl-3-(dichloroacetyl)-1,3-oxazolidine [CAS No. 52836-31-4] is also known under the name R-29148. 4-(Dichloroacetyl)-1-oxa-4-azaspiro[4.5]decane [CAS No. 71526-07-03] is also known under the names AD-67 and MON 4660.
The categorization of the active compounds according to their mode of action is based on current understanding. If an active compound acts by more than one mode of action, this substance was assigned to only one mode of action.
If the phenyluracils I and/or the herbicides C are capable of forming geometrical isomers, for example E/Z isomers, it is possible to use both the pure isomers and mixtures thereof in the compositions according to the invention. If the phenyluracils I and/or the herbicides C have one or more centers of chirality and, as a consequence, are present as enantiomers or diastereomers, it is possible to use both the pure enantiomers and diastereomers and their mixtures in the compositions according to the invention.
If the phenyluracils I and/or the herbicides C have functional groups which can be ionized, they can also be used in the form of their agriculturally acceptable salts. Also tribenuron has such functional groups and can therefore be used in the form of such salts. In general, the salts of those cations or the acid addition salts of those acids are suitable whose cations and anions, respectively, have no adverse effect on the action of the active compounds. The same is applicable with regard to tribenuron and/or its derivatives such as tribenuron-methyl.
Preferred cations are the ions of the alkali metals, preferably of lithium, sodium and potassium, of the alkaline earth metals, preferably of calcium and magnesium, and of the transition metals, preferably of manganese, copper, zinc and iron, furthermore ammonium and substituted ammonium in which one to four hydrogen atoms are replaced by C1-C4-alkyl, hydroxy-C1-C4-alkyl, C1-C4-alkoxy-C1-C4-alkyl, hydroxy-C1-C4-alkoxy-C1-C4-alkyl, phenyl or benzyl, preferably ammonium, methylammonium, isopropylammonium, dimethylammonium, diisopropylammonium, trimethylammonium, tetramethyl-ammonium, tetraethylammonium, tetrabutylammonium, 2-hydroxyethylammonium, 2-(2-hydroxyethoxy)eth-1-ylammonium, di(2-hydroxyeth-1-yl)ammonium, benzyl-trimethylammonium, benzyltriethylammonium, furthermore phosphonium ions, sulfonium ions, preferably tri(C1-C4-alkyl)sulfonium such as trimethylsulfonium, and sulfoxonium ions, preferably tri(C1-C4-alkyl)sulfoxonium.
It is possible to use the active compounds of the formula I, tribenuron and at least one herbicide C selected from chlorazifop, clodinafop, clofop, cyhalofop, diclofop, fenoxaprop, fenoxaprop-P, fenthiaprop, fluazifop, fluazifop-P, haloxyfop, haloxyfop-P, isoxapyrifop, propaquizafop, quizalofop, quizalofop-P, trifop, alloxydim, butroxydim, clethodim, cloproxydim, cycloxydim, profoxydim, sethoxydim, tepraloxydim, tralkoxydim, amidosulfuron, azimsulfuron, bensulfuron, chlorimuron, chlorsulfuron, cinosulfuron, cyclosulfamuron, ethametsulfuron, ethoxysulfuron, flazasulfuron, flupyrsulfuron, foramsulfuron, halosulfuron, imazosulfuron, iodosulfuron, mesosulfuron, metsulfuron, nicosulfuron, oxasulfuron, primisulfuron, prosulfuron, pyrazosulfuron, rimsulfuron, sulfometuron, sulfosulfuron, thifensulfuron, triasulfuron, trifloxysulfuron, triflusulfuron, tritosulfuron, propoxycarbazon, flucarbazon, imazamethabenz, imazamox, imazapic, imazapyr, imazaquin, imazethapyr, cloransulam, diclosulam, florasulam, flumetsulam, metosulam, penoxsulam, bispyribac, pyrithiobac, flucetosulfuron, orthosulfamuron, pyrimisulfam, [N-(5,7-dimethoxy[1,2,4]triazolo[1,5-a]-pyrimidin-2-yl-2-methoxy-4-(trifluoromethyl)-3-pyridinsulfonamide, pyriminobac, bentazon, acifluorfen, ethoxyfen, fluoroglycofen, fomesafen, halosafen, lactofen, pyraflufen, flumiclorac, fluthiacet, carfentrazone, flufenpyr, mesotrione, sulcotrione, topramezone, 4-hydroxy-3-{[2-methyl-6-(trifluoromethyl)-3-pyridinyl]carbonyl}bicylo-[3.2.1]oct-3-en-2-one, 4-hydroxy-3-{[2-(2-methoxyethoxy)methyl-6-(trifluoromethyl)-3-pyridinyl]carbonyl}bicyclo[3.2.1]oct-3-en-2-one, 4-hydroxy-3-[4-(methylsulfonyl)-2-nitrobenzoyl]-bicyclo[3.2.1]oct-3-en-2-one, 2-[2-chloro-4-(methylsulfonyl)-3-[(2,2,2-trifluoroethoxy)methyl]benzoyl]-3-hydroxy-2-cyclohexen-1-one, pyrasulfotole, glyphosate, glufosinate, bilanaphos, clomeprop, 2,4-D, 2,4 DB, dichlorprop, dichlorprop-P, MCPA, MCPB, mecoprop, mecoprop-P, 2,4,5-T, chloramben, dicamba, 2,3,6-TBA, tricamba, quinclorac, quinmerac, clopyralid, fluroxypyr, picloram, triclopyr, aminopyralid, naptalam, diflufenzopyr, cloquintocet, fenchlorazole, isoxadifen and mefenpyr, in the form of salts with the agriculturally useful cations mentioned above.
Anions of useful acid addition salts are primarily chloride, bromide, fluoride, iodide, hydrogen sulfate, methyl sulfate, sulfate, dihydrogen phosphate, hydrogen phosphate, nitrate, dicarbonate, carbonate, hexafluorosilicate, hexafluorophosphate, benzoate and the anions of C1-C4-alkanoic acids, preferably formate, acetate, propionate and butyrate.
According to the invention, the herbicides cyperquat, diethamquat, difenzoquat, diquat, morfamquat and paraquat are usually employed in the form of salts with the agriculturally useful anions mentioned above.
According to the invention, the active compounds which carry a carboxyl group can, instead of the active compounds mentioned above, also be employed in the form of an agriculturally acceptable derivative, for example as amides such as mono- or di-C1-C6-alkylamides or arylamides, as esters, for example as allyl esters, propargyl esters, C1-C10-alkyl esters or alkoxyalkyl esters, and also as thioesters, for example as C1-C10-alkyl thioesters. Examples of active compounds having a COOH group which can also be employed as derivatives are: tribenuron, chlorazifop, clodinafop, clofop, cyhalofop, diclofop, fenoxaprop, fenoxaprop-P, fenthiaprop, fluazifop, fluazifop-P, haloxyfop, haloxyfop-P, isoxapyrifop, propaquizafop, quizalofop, quizalofop-P, trifop, bensulfuron, chlorimuron, ethametsulfuron, flupyrsulfuron, halosulfuron, iodosulfuron, mesosulfuron, metsulfuron, primisulfuron, pyrazosulfuron, sulfometuron, thifensulfuron, tribenuron, triflusulfuron, imazamethabenz, imazamox, imazapic, imazapyr, imazaquin, imazethapyr, cloransulam, bispyribac, pyrithiobac, pyriminobac, acifluorfen, ethoxyfen, fluoroglycofen, lactofen, pyraflufen, flumiclorac, fluthiacet, carfentrazone, flufenpyr, clomeprop, 2,4-D, 2,4-DB, dichlorprop, dichlorprop-P, MCPA, MCPB, mecoprop, mecoprop-P, 2,4,5-T, chloramben, dicamba, 2,3,6-TBA, tricamba, quinclorac, quinmerac, clopyralid, fluoroxypyr, picloram, triclopyr, aminopyralid, naptalam, diflufenzopyr, cloquintocet, fenchlorazole, isoxadifen and mefenpyr.
Preferred mono- and di-C1-C6-alkylamides are the methyl- and the dimethylamides. Preferred arylamides are, for example, the anilidines and the 2-chloroanilides. Preferred alkyl esters are, for example, the methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, mexyl (1-methylhexyl) or isooctyl (2-ethylhexyl) esters. Preferred C1-C4-alkoxy-C1-C4-alkyl esters are the straight-chain or branched C1-C4-alkoxyethyl esters, for ex-ample the methoxyethyl, ethoxyethyl or butoxyethyl esters. An example of the straight-chain or branched C1-C10-alkyl thioesters is the ethyl thioester.
In case of tribenuron, the esters and in particular the C1-C10-alkyl esters, more particularly the C1-C6-alkyl esters, are preferred. The most preferred tribenuron derivative is the methyl ester, i.e. tribenuron-methyl.
According to the invention binary and ternary compositions are used comprising at least one 3-phenyluracil of formula I as active compound A in combination with component B and optionally with at least one herbicide C.
Here and below, the term “binary compositions” includes compositions which comprise one or more, for example 2 or 3, active compounds A, and component B. Correspondingly, the term “ternary compositions” includes compositions which comprise one or more, for example 2 or 3, active compounds A, component B and one or more, for example 2 or 3, herbicides C.
In binary compositions which comprise at least one 3-phenyluracil of the formula I and component B, the weight ratio of the active compounds A:B is usually in the range from 1:100 to 10:1, preferably from 1:50 to 10:1 and in particular in the range from 1:25 to 5:1.
In ternary compositions which comprise both a 3-phenyluracil I as component A, component B and at least one herbicide C, the relative weight ratios of the components A:B:C are usually in the range from 10:1:1 to 1:10:500, preferably from 10:1:1 to 1:10:100, in particular from 10:1:1 to 1:1:50 and particularly preferably from 5:1:1 to 1:25:5. In these ternary compositions, the weight ratio of herbicide C to component B is preferably in the range from 50:1 to 1:10.
In a particularly preferred embodiment of the invention, preference is given to those compositions of the invention which comprise a 3-phenyluracil of the formula I, especially of formulae Ia or Ib, in combination with component B and optionally at least one and especially exactly one herbicidally active compound of the group c1), in particular selected from the group consisting of clodinafop, fenoxaprop, fenoxaprop-P, tralkoxydim and pinoxaden.
In another particularly preferred embodiment of the invention, preference is given to those compositions of the invention which comprise a 3-phenyluracil of the formula I, especially of formulae Ia or Ib, in combination with component B and optionally at least one and especially exactly one herbicidally active compound of the group c2), in particular selected from the group consisting of chlorsulfuron, mesosulfuron, metsulfuron, prosulfuron, sulfosulfuron, propoxycarbazone, flucarbazone, imazamethabenz, imazamox, imazapic, imazapyr, imazaquin, imazethapyr, thifensulfuron, triasulfuron and [N-(5,7-dimethoxy[1, 2,4]triazolo[1,5-a]pyrimidin-2-yl-2-methoxy-4-(trifluoromethyl)-3-pyridinesulfonamide.
In another particularly preferred embodiment of the invention, preference is given to those compositions of the invention which comprise a 3-phenyluracil of the formula I, especially of formulae Ia or Ib, in combination with component B and optionally at least one and especially exactly one herbicidally active compound of the group c3), in particular selected from the group consisting of bromoxynil and ioxynil.
In another particularly preferred embodiment of the invention, preference is given to those compositions of the invention which comprise a 3-phenyluracil of the formula I, especially of formulae Ia or Ib, in combination with component B and optionally at least one and especially exactly one herbicidally active compound of the group c13), in particular selected from the group consisting of 2,4-D, dichlorprop, dichlorprop-P, mecoprop, MCPA, mecoprop-P, dicamba, clopyralid, fluoroxypyr and aminopyralid.
For application ready-to-use preparations in the form of crop protection products can be employed. Component A, component B and optionally component C may be present in suspended, emulsified or dissolved form and can be formulated jointly or separately. The application forms depend entirely on the intended use.
The preparations can be applied, for example, in the form of directly sprayable aqueous solutions, powders, suspensions, also highly-concentrated aqueous, oily or other suspensions or dispersions, emulsions, oil dispersions, pastes, dusts, materials for spreading or granules, by means of spraying, atomizing, dusting, broadcasting or watering. The use forms depend on the intended use; in any case, they should ensure the finest possible distribution of the active compounds.
Depending on the form in which the ready-to-use preparations are present, they comprise one or more liquid or solid carriers, if appropriate surfactants and if appropriate further auxiliaries which are customary for formulating crop protection products. The person skilled in the art is sufficiently familiar with the recipes for such formulations.
The ready-to-use preparations may comprise auxiliaries which are customary formulating crop protection products, which auxiliaries may also comprise a liquid carrier.
Suitable inert additives with carrier function are essentially: mineral oil fractions of medium to high boiling point, such as kerosene and diesel oil, furthermore coal tar oils and oils of vegetable or animal origin, aliphatic, cyclic and aromatic hydrocarbons, e.g. paraffins, tetrahydronaphthalene, alkylated naphthalenes and their derivatives, alkylated benzenes and their derivatives, alcohols such as methanol, ethanol, propanol, butanol and cyclohexanol, ketones such as cyclohexanone, strongly polar solvents, e.g. amines such as N-methylpyrrolidone, and water.
Aqueous use forms can be prepared from emulsion concentrates, suspensions, pastes, wettable powders or water-dispersible granules by adding water. To prepare emulsions, pastes or oil dispersions, the active compound(s) as such or dissolved in an oil or solvent, can be homogenized in water by means of wetting agent, tackifier, dispersant or emulsifier. Alternatively, it is possible to prepare concentrates consisting of active substance, wetting agent, tackifier, dispersant or emulsifier and, if desired, solvent or oil, and these concentrates are suitable for dilution with water.
Suitable surfactants are the alkali metal salts, alkaline earth metal salts and ammonium salts of aromatic sulfonic acids, e.g. ligno-, phenol-, naphthalene- and dibutylnaphthalenesulfonic acid, and of fatty acids, of alkyl- and alkylarylsulfonates, of alkyl sulfates, lauryl ether sulfates and fatty alcohol sulfates, and salts of sulfated hexa-, hepta- and octadecanols and of fatty alcohol glycol ethers, condensates of sulfonated naphthalene and its derivatives with formaldehyde, condensates of naphthalene or of the naphthalenesulfonic acids with phenol and formaldehyde, polyoxyethylene octylphenol ether, ethoxylated isooctyl-, octyl- or nonylphenol, alkylphenyl polyglycol ethers, tributylphenyl polyglycol ether, alkylaryl polyether alcohols, isotridecyl alcohol, fatty alcohol/ethylene oxide condensates, ethoxylated castor oil, polyoxyethylene alkyl ether or polyoxypropylene alkyl ether, lauryl alcohol polyglycol ether acetate, sorbitol esters, lignosulfite waste liquors or methylcellulose.
Powders, materials for spreading and dusts can be prepared by mixing or concomitant grinding of the active substances with a solid carrier.
Granules, e.g. coated granules, impregnated granules and homogeneous granules, can be prepared by binding the active ingredient (s) to solid carriers. Solid carriers are mineral earths such as silicas, silica gels, silicates, talc, kaolin, limestone, lime, chalk, bole, loess, clay, dolomite, diatomaceous earth, calcium sulfate, magnesium sulfate, magnesium oxide, ground synthetic materials, fertilizers such as ammonium sulfate, ammonium phosphate, ammonium nitrate, ureas, and products of vegetable origin such as cereal meal, tree bark meal, wood meal and nutshell meal, cellulose powders, or other solid carriers.
The concentrations of the active compound(s) in the ready-to-use preparations can be varied within wide ranges. In general, the formulations comprise from 0.001 to 98% by weight, preferably 0.01 to 95% by weight, of active ingredient (s). The active ingredient (s) are employed in a purity of from 90% to 100%, preferably 95% to 100% (according to NMR spectrum).
The preparations can, for example, be formulated as follows:
The components A, B and C can be formulated jointly or separately.
The components A, B and C can be applied jointly or separately, simultaneously or successively, before, during or after emergence of the plants.
If the active compound(s) are less well tolerated by certain crop plants, it is possible to use application methods in which the herbicidal compositions are sprayed with the aid of sprayers in such a way that the leaves of the sensitive crop plants are as far as possible unaffected, whereas the active compounds reach the leaves of the undesirable plants growing underneath or the uncovered soil surface (post-directed, lay-by).
The required application rate of the pure active compounds, i.e. of component A, in combination with component B and/or optionally in combination with component C without formulation auxiliary, depends on the density of the undesired vegetation, on the development stage of the plants, on the climatic conditions of the location where the composition is used and on the application method. In general, the application rate is from 0.001 to 3 kg/ha, preferably from 0.005 to 2 kg/ha and in particular from 0.01 to 1 kg/ha, from 0.1 g/ha to 1 kg/ha, from 1 g/ha to 500 g/ha or from 5 g/ha to 500 g/ha of active substance.
The preparations are applied to the plants mainly by spraying, in particular foliar spraying. Application can be carried out by customary spraying techniques using, for example, water as carrier and spray liquid rates of from about 50 to 1 000 l/ha (for example from 300 to 400 l/ha). Application of the preparations by the low-volume and the ultra-low-volume method is possible, as is their application in the form of microgranules.
Moreover, it may be useful to apply the compositions according to the invention jointly as a mixture with other crop protection products, for example with pesticides or agents for controlling phytopathogenic fungi or bacteria. Also of interest is the miscibility with mineral salt solutions which are employed for treating nutritional and trace element deficiencies. Non-phytotoxic oils and oil concentrates may also be added.
According to a preferred embodiment, the invention provides for weed control in wheat, oat, barley or rye.
The weed control according to the present invention may be provided in transgenic or resistant small-grain cereals, in particular wheat. More preferably, the transgenic or resistant crop of small-grain cereals may be a glyphosate resistant crop, an oxynil resistant crop, a glufosinate resistant crop, an imidazolinone resistant crop, a sulfonylurea resistant crop, a dicamba tolerant crop, a cyclohexanedione resistant crop, a PPO resistant crop, an HPPD resistant crop, a fungus resistant crop, an insect resistant crop, or a crop which by means of multiple changes of the genome (“stacked traits”) exhibits more than one of said resistance properties. Most preferably, the crop is a glyphosate resistant crop, an imidazolinone resistant crop or a crop which by means of multiple changes of the genome (“stacked traits”) is both a glyphosate and/or imidazolinone resistant and/or a fungus resistant crop.
The weed control according to the present invention can be provided in crops which are resistant to one or more herbicides and/or which are resistant to the attack of fungi and/or which are resistant to the attack of insects, whereby resistance may be conferred by genetic engineering. For example, by said techniques such crops may have acquired the capability to synthesize (i) one or more selectively acting toxins, in particular fungicidal toxins or insecticidal toxins, such as those which are known from toxin producing bacteria, especially those of the genus bacillus, for example endotoxins, e.g. CryIA(b), CryIA(c), CryIF, CryIF(a2), CryIIA(b), CryIIIA, CryIIB(b1), Cry9c, VIP1, VIP2, VIP3 or VIP3A or hybrids (i.e. combinations of different domains of such toxins), modifications (by replacement of one or more of the amino acids as compared to the naturally occurring sequence, e.g. CryIIIA055) and/or truncated versions thereof, and/or (ii) an altered amount of an enzyme which is the target of a herbicide, and/or (iii) a modified form of an enzyme which is the target of a herbicide, and/or (iv) one or more enzymes which are alone or together capable of converting a herbicide into a chemical which is not toxic to the plant and/or (v) antipathogenic substances, such as, for example, the so-called “pathogenesis-related proteins”. Such crops are illustrated by, but not limited to, the examples described in the following table, which are commercially available or known to the person skilled in the art or described in the quoted publications, and by any other examples which arise from stacking more than one of the traits listed in table 2. Amongst the traits listed in table 2, those are preferred which provide imidazolinone and/or glyphosate and/or fungus resistance.
The following examples illustrate the invention without limiting it.
The effect of the use of safened herbicidal combinations according to the present invention on the growth of crop plants and/or undesired plants was demonstrated by field tests (examples 1-2).
The phenyluracils I and/or the other active ingredients according to the present invention were formulated in a suitable way, either separately or in mixture, e.g. as emulsifiable concentrates (EC), soluble concentrates (SL), suspo-emulsions (SE), suspension concentrates (SC) or water-dispersible granules (WG). The formulation(s) were suspended or emulsified in water as a distribution medium immediately prior to spraying. Afterwards, the aqueous mixture was evenly sprayed on the test plots by means of finely distributing nozzles.
The test plots were of uniform size (typically between 14 and 37 square meters, each) and the distribution of treated and untreated plots was organized according to a randomised bloc design. Crops were sown in rows at a season which was typical for the region and the crop according to usual farm practice. Weeds were not sown but germinated according to the natural infestation.
For pre-plant and pre-plant burn-down treatments, the plots were treated before the crop was planted, typically 7 to 28 days prior to planting. For pre-emergence treatments, the plots were treated at planting (plus or minus two days) but before emergence. For post-emergence or in-crop treatments, the plots were treated after the emergence of the weed or crop, typically 20 to 50 days after planting.
The evaluation of the damage caused by the phenyluracils I and/or the other active ingredients according to the present invention was carried out using a scale from 0 to 100%, compared to the untreated control plots. Here, 0 means no damage and 100 means complete destruction of the plants of a respective weed or crop species.
A safener action is present if the damage to the crop plant caused by using a mixture according to the present invention which contains tribenuron-methyl is less than the damage caused when the phenyluracil I optionally in mixture with the other herbicides according to the present invention is used without tribenuron-methyl.
The results are shown in the following table 3.
In this example, Phenyluracil I.7 was formulated as a 120 g/l EC, and tribenuron-methyl as a 75% WG. Prior to application, the formulated active ingredients were tank-mixed with an aqueous 100 l/ha spray solution which contained, in addition, 10 g/l of Assist oil concentrate. The cereal crops were planted 27 days before treatment.
The results are shown in the following table 4.
In this example, Phenyluracil I.7 was formulated as a 120 g/l EC, and tribenuron-methyl as a 75% WG. Prior to application, the formulated active ingredients were tank-mixed with an aqueous 100 l/ha spray solution which contained, in addition, 10 g/l of Assist oil concentrate. The cereal crops were planted 27 days before treatment.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2006/007616 | 8/1/2006 | WO | 00 | 2/22/2008 |
| Number | Date | Country | |
|---|---|---|---|
| 60703893 | Aug 2005 | US |
