Herbicide-safener combination based on isoxozoline carboxylate safeners

Abstract

Herbicide safener combiantions consisting of A) an effective amount of a compound of the formula (1) or a salt thereof, in which R 1 is phenyl which is unsubstituted or substituted, R 2 is (C 1 -C 6 )alkyl, (C 3 -C 6 )cycloalkyl or phenyl, each of the 3 last-mentioned radicals is unsubstituted or substituted, R 3 is hydrogen or a hydrocarbon radical having 1 to 18 C-atoms which is unsubstituted or substituted, and B) a herbicide selected form the group consisting of and florasulam, chloransulam, dicamba, diflufenzopyr; triclopyr, fluroxypyr, metribuzin, carfentrazone-ethyl, S.metolachlor, dimethenamide, dimethenamide-P or flufenacet and mixtures of the above herbicides, optionally in combination with toher herbicidal active ingredients can be used for effective selective cotrolling weeds in crop such as maize.

1 . herbicide safener combination consisting of 
 A) an effective amount of a compound of the formula (I) or a salt thereof,                           in which 
 R 1  is phenyl which is unsubstituted or substituted,  
 R 2  is (C 1 -C 6 )alkyl, (C 3 -C 6 )cycloalkyl or phenyl, each of the 3 last-mentioned radicals is unsubstituted or substituted,  
 R 3  is hydrogen or a hydrocarbon radical having 1 to 18 C-atoms which is unsubstituted or substituted,  
 and  
   B) a herbicide selected from the group consisting of 
 (B1) Triazolopyrimidine derivatives (B1-1) and (B1-2)  
 (B1-1) N-(2,6-difluorophenyl)-8-fluoro-5-methoxy-1,2,4-triazolo[1,5-c]pyrimidin-2-sulfonamide (florasulam),  
 (B-1-2) methyl 3-chloro-(5-ethoxy-7-fluoro[1,2,4]triazole-[1,5-c]pyrimidin-2-ylsulfonamido)-benzoate (chloransulam)  
 (B2) plant hormone-type herbicides (B2-1) to (B2-4)  
 (B2-1) 3,6-dichloro-2-methoxy-benzoic acid and salts and esters (e.g. methyl ester) thereof; (dicamba),  
 (B2-2) 2-{1-[4-(3,5-difluorophenyl)semicarbazono]ethyl}nicotinic acid and salts (e.g. sodium salt) thereof (diflufenzopyr);  
 (B2-3) 3,5,6-trichloro-2-pyridyloxyacetic acid (triclopyr);  
 (B2-4) 4-amino-3,5-dichloro-6-fluoro-2-pyridyloxyacetic acid and salts and esters thereof (fluroxypyr); and  
 (B3-1) 4-amino-6-tert-butyl-4,5-dihydro-3-methylthio-1,2,4-triazin-5-one (metribuzin);  
 (B4-1) ethyl (RS)-2-chloro-3-[2-chloro-5-(4-difluoromethyl-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl) 4 -fluorophenyl]propionate (carfentrazone-ethyl)  
 (B5) chloroacetanilides (B5-1) to (B5-4)  
 (B5-1) 2-chloro-N-(2-ethyl-6-methylphenyl)-N-[(1S)-2-methoxy-1-methylethyl)]-acetamide (S-metolachlor),  
 (B5-2) (RS)-2-chloro-N-(2,4-diethyl-3-thienyl)-N-(2-methoxy-1-methylethyl)acetamide (dimethenamide),  
 (B5-3) (S)-2-chloro-N-(2,4-diethyl-3-thienyl)-N-(2-methoxy-1-methylethyl)acetamide (dimethenamide-P), and  
 (B5-4) 4′-fluoro-N-isopropyl-2-[5-trifluoromethyl-1,3,4-thiadiazol-2-yloxy]acetanilide (flufenacet) and  
 mixtures of the above herbicides, optionally in combination with other herbicidal active ingredients.  
   
     
     
         2 . A combination as claimed in  claim 1  wherein in formula (I) 
 R 1  is phenyl which is unsubstituted or substituted by one or more radicals selected from the group consisting of halogen, cyano, nitro, amino, (C 1 -C 4 )haloalkyl, (C 1 -C 4 )haloalkoxy, (C 1 -C 4 )alkyl, (C 1 -C 4 )alkoxy, mono(C 1 -C 4 )alkyl-amino, di(C 1 -C 4 )alkyl-amino, (C 1 -C 4 )alkylthio and (C 1 -C 4 )alkylsulfonyl,  
 R 2  is (C 1 -C 6 )alkyl, (C 3 -C 6 )cycloalkyl or phenyl, each of the 3 last-mentioned radicals is unsubstituted or substituted by one or more radicals selected from the group consisting of halogen, cyano, nitro, amino, (C 1 -C 4 )haloalkyl, (C 1 -C 4 )haloalkoxy, (C 1 -C 4 )alkyl, (C 1 -C 4 )alkoxy, mono(C 1 -C 4 )alkyl-amino, di(C 1 -C 4 )alkyl-amino, (C 1 -C 4 )alkylthio and (C 1 -C 4 )alkylsulfonyl,  
 R 3  is hydrogen or a hydrocarbon radical having 1 to 18 C-atoms which is unsubstituted or substituted by one or more radicals selected from the group consisting of 
 halogen, cyano, thio, nitro, hydroxyl, (C 1 -C 6 )alkyl, (C 1 -C 6 )haloalkyl, the 2 last-mentioned radicals as substituents of cyclic radicals only, (C 1 -C 6 )alkoxy, (C 2 -C 6 )alkenyloxy, (C 2 -C 6 )alkinyloxy, (C 1 -C 6 )haloalkoxy, (C 2 -C 6 )alkylthio, (C 3 -C 6 )cycloalkyl, (C 3 -C 6 )cycloalkoxy, (C 1 -C 8 )alkoxy-carbonyl, (C 2 -C 6 )alkenyloxy-carbonyl, (C 2 -C 6 )alkinyloxy-carbonyl, (C 1 -C 8 )alkyl-carbonyl, (C 1 -C 6 )alkyl-carbonyloxy, phenyl, phenyl-(C 1 -C 6 )alkoxy, phenyl-(C 1 -C 6 )alkoxy-carbonyl, phenoxy, phenoxy-(C 1 -C 6 )alkoxy, phenoxy-(C 1 -C 6 )alkoxy-carbonyl, phenoxycarbonyl, phenylcarbonyloxy and phenyl-(C 1 -C 6 )alkyl-carbonyloxy,  
 wherein the 9 last-mentioned radicals are unsubstituted or substituted in the phenyl ring by one or more radicals selected from the group consisting of halogen, (C 1 -C 4 )alkyl, (C 1 -C 4 )alkoxy, (C 1 -C 4 )haloalkyl, (C 1 -C 4 )haloalkoxy and nitro,  
 
 and radicals of the formula —O—N═CR′ 2 , —N═CR′ 2 . 
 wherein the R′ in the formulae independently of one another are hydrogen, (C 1 -C 4 )alkyl or phenyl, which is unsubstituted or substituted by one or more radicals selected from the group consisting of halogen, (C 1 -C 4 )alkyl, (C 1 -C 4 )alkoxy, (C 1 -C 4 )haloalkyl, (C 1 -C 4 )haloalkoxy and nitro, or together are a (C 2 -C 6 )alkylene chain.  
 
 
     
     
         3 . combination claimed in  claim 1  or  2  wherein in formula (I) 
 R 1  and R 2  both are phenyl and R 3  is hydrogen or (C 1 -C 6 )alkyl which is unsubstituted or substituted by one or more radicals selected from the group consisting of halogen, cyano, (C 1 -C 4 )alkoxy, (C 2 -C 4 )alkenyloxy, (C 2 -C 4 )alkinyloxy, (C 1 -C 4 )haloalkoxy, (C 2 -C 4 )alkylthio, (C 3 -C 6 )cycloalkyl, (C 3 -C 6 )cycloalkoxy, (C 1 -C 4 )alkoxy-carbonyl, (C 2 -C 4 )alkenyloxy-carbonyl, (C 2 -C 4 )alkinyloxy-carbonyl, (C 1 -C 4 )alkyl-carbonyl, (C 1 -C 4 )alkyl-carbonyloxy, phenyl which is unsubstituted or substituted in the phenyl ring by one or more radicals selected from the group consisting of halogen, (C 1 -C 4 )alkyl, (C 1 -C 4 )alkoxy, (C 1 -C 4 )haloalkyl and (C 1 -C 4 )haloalkoxy.  
 
     
     
         4 . A combination as claimed in any of  claims 1  to  3  wherein in formula (I) R 3  is H or (C 1 -C 4 )alkyl.  
     
     
         5 . A combination as claimed in  claim 1  wherein the safener of formula (I) is 5,5-diphenyl-2-isoxazoline-3-carboxylic acid.  
     
     
         6 . A combination as claimed in  claim 1  wherein the safener of formula (I) is ethyl 5,5-diphenyl-2-isoxazoline-3-carboxylate.  
     
     
         7 . A combination as claimed in any of  claims 1  to  5  which is a co-formulation additionally containing formulation auxiliaries.  
     
     
         8 . A method of combatting weed plants in a crop of useful plants wherein a safener A) is applied to the plants, seed of the plants or the area under cultivation before, simultaneously or after a herbicide A) pre-emergent and/or post-emergent related to the crop and wherein the safener A) and the herbicide B) are as defined in any of  claims 1  to  7 .  
     
     
         9 . A method of reducing the phytotoxicity of a herbicide B) to a crop plant wherein a safener A) is applied to the plants, seed of the plants or the area under cultivation before, simultaneously or after a herbicide A) pre-emergent and/or post-emergent related to the crop and wherein the safener A) and the herbicide B) are as defined in any of  claims 1  to  7 .