Herbicidal compositions containing n-phosphonomethyl glycine and an auxin herbicide

Abstract

Herbicidal compositions are provided which cause rapid symptomology while delivering long term control of regrowth of plants. The herbicidal concentrate compositions comprise N-phosphonomethylglycine or a herbicidal derivative thereof, an auxin herbicide or a herbicidal derivative thereof, and at least one surfactant. Also provided is a method for killing or controlling the growth of certain plants by contacting the foliage of the plants with the diluted concentrate composition.

What is claimed is: 
     
         1 . An aqueous herbicidal concentrate composition comprising:
 (a) glyphosate or a herbicidal derivative thereof, in a concentration of at least 150 grams acid equivalent per liter;   (b) an auxin herbicide component comprising one or more auxin herbicides selected from the group consisting of 2,4-D, 2,4-DB, dichlorprop, MCPA, MCPB, mecoprop, dicamba, picloram, quniclorac and agriculturally acceptable salts or esters thereof; and   (c) a first surfactant component in solution or stable suspension, emulsion or dispersion and comprising an amine oxide having the formula:   
       
         
           
           
               
               
           
         
       
       wherein R 51 , R 52  and R 53  are independently hydrogen, hydrocarbyl or substituted hydrocarbyl, —(R 54 O) x   5 R 55 , or —R 56 (OR 54 ) x   5 OR 55 , R 54  in each of the x 5  (R 54 O) groups is independently C 2 -C 4  alkylene, R 55  is hydrogen, or a linear or branched alkyl group having from 1 to about 30 carbon atoms, R 56  is hydrocarbylene or substituted hydrocarbylene having from 2 to about 6 carbon atoms, x 5  is an average number from 1 to about 50, and the total number of carbon atoms in R 51 , R 52  and R 53  is at least 8. 
     
     
         2 . The composition of  claim 1  comprising glyphosate in the form of the potassium, isopropylamine, di-ammonium, ammonium, sodium, monoethanolamine, n-propylamine, methylamine, ethylamine, hexamethylenediamine, dimethylamine, or trimethylsulfonium salt thereof. 
     
     
         3 . The composition of  claim 2  comprising glyphosate in the form of the dimethylamine salt thereof. 
     
     
         4 . The composition of  claim 1  wherein the auxin herbicide component comprises one or more auxin herbicides selected from the group consisting of 2,4-D, dicamba and agriculturally acceptable salts or esters thereof. 
     
     
         5 . The composition of  claim 1  wherein the auxin herbicide component comprises 2,4-D or an agriculturally acceptable salt thereof. 
     
     
         6 . The composition of  claim 1  wherein the auxin herbicide component comprises dicamba or an agriculturally acceptable salt thereof. 
     
     
         7 . The composition of  claim 1  wherein the glyphosate is present in an amount of from about 150 to about 600 grams acid equivalent per liter. 
     
     
         8 . The composition of  claim 1  wherein the first surfactant component is present in the composition is in an amount of at least about 5 wt. % based on the total weight of the composition. 
     
     
         9 . The composition of  claim 1  wherein the composition has a cloud point of at least about 50° C. 
     
     
         10 . The composition of  claim 1  wherein the composition has a crystallization point not higher than about 0° C. 
     
     
         11 . The composition of  claim 1  wherein R 51  and R 52  are independently hydrogen, a linear or branched alkyl or linear or branched alkenyl group having from 1 to about 30 carbon atoms, or —(R 54 O) x   5 R 55 , R 53  is a linear or branched alkyl or linear or branched alkenyl group having from about 8 to about 30 carbon atoms, R 54  in each of the x 5  (R 54 O) groups is independently C 2 -C 4  alkylene; R 55  is hydrogen, methyl or ethyl, and x 5  is an average number from 1 to about 30. 
     
     
         12 . The composition of  claim 1  wherein R 51  and R 52  are independently hydrogen, or a linear or branched alkyl group having from 1 to about 6 carbon atoms, and R 53  is a linear or branched alkyl group having from about 8 to about 22 carbon atoms. 
     
     
         13 . The composition of  claim 1  wherein R 51  and R 52  are independently methyl, and R 53  is a linear or branched alkyl group having from about 8 to about 18 carbon atoms. 
     
     
         14 . The composition of  claim 1  further comprising a water-soluble solvent. 
     
     
         15 . The composition of  claim 14  wherein the water-soluble solvent is selected from the group consisting of methylene glycol, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, polyalkalene glycol, and mixtures thereof. 
     
     
         16 . The composition of  claim 1  further comprising an organic acid. 
     
     
         17 . An aqueous herbicidal concentrate composition comprising:
 (a) glyphosate in the form of the dimethylamine salt thereof, in a concentration of from about 150 to about 600 grams acid equivalent per liter;   (b) an auxin herbicide component comprising 2,4-D or an agriculturally acceptable salt thereof;   (c) a first surfactant component in solution or stable suspension, emulsion or dispersion and comprising an amine oxide having the formula:   
       
         
           
           
               
               
           
         
       
       wherein R 51  and R 52  are independently hydrogen, or a linear or branched alkyl group having from 1 to about 6 carbon atoms, and R 53  is a linear or branched alkyl group having from about 8 to about 22 carbon atoms; and
 (d) a water-soluble solvent selected from the group consisting of methylene glycol, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, polyalkalene glycol, and mixtures thereof. 
 
     
     
         18 . The composition of  claim 17  wherein R 51  and R 52  are independently methyl, and R 53  is a linear or branched alkyl group having from about 8 to about 18 carbon atoms. 
     
     
         19 . The composition of  claim 17  wherein the water-soluble solvent comprises propylene glycol. 
     
     
         20 . The composition of  claim 17  further comprising an organic acid.