Herbicidal concentrate compositions containing glyphosate and dicamba salts

Abstract

The mixture of potassium or certain amine salts of glyphosate and dicamba allows the preparation of high-strength liquid compositions containing greater than 300 gae/L of total active ingredient loading if the pH is adjusted between about 6.0 and about 8.0. Compositions are particularly well-suited for herbicidal applications on crops that are resistant or tolerant to both glyphosate and dicamba.

What is claimed is: 
     
         1 . A homogeneous, stable, high-strength aqueous herbicidal concentrate composition comprising:
 (a) water,   (b) a glyphosate potassium or amine salt, and   (c) a dicamba potassium or amine salt,   
       in which (i) the glyphosate salt is potassium or a secondary, tertiary or quaternary alkylamine or a primary, secondary, tertiary or quaternary alkanolamine, alkylalkanolamine or alkoxyalkanolamine salt, wherein the alkyl and alkanol groups are saturated and contain from C 1 -C 4  carbon atoms individually, (ii) the dicamba salt is potassium or a secondary, tertiary or quaternary alkylamine or a primary, secondary, tertiary or quaternary alkanolamine, alkylalkanolamine or alkoxyalkanolamine salt, wherein the alkyl and alkanol groups are saturated and contain from C 1 -C 4  carbon atoms individually, (iii) the composition contains a total active ingredient loading of at least 300 gae/L of the glyphosate potassium or amine salt and the dicamba potassium or amine salt, (iv) the acid equivalent weight ratio of the glyphosate potassium or amine salt to the dicamba potassium or amine salt is from about 1:1 to about 3:1, and (v) the pH is from about 6.0 to about 8.0. 
     
     
         2 . A composition of  claim 1  which contains a total active ingredient loading of greater than about 450 grams of acid equivalent of the glyphosate potassium or amine salt and the dicamba potassium or amine salt. 
     
     
         3 . A composition of  claim 1  in which the acid equivalent weight ratio of the glyphosate potassium or amine salt to the dicamba potassium or amine salt is about 1.5:1 to about 3:1. 
     
     
         4 . A composition of  claim 1  in which the pH is from about 6.5 to about 7.5. 
     
     
         5 . A composition of  claim 1  in which the glyphosate salt is potassium or a monoethanolamine, dimethylethanolamine, dimethylamine, diglycolamine or choline salt. 
     
     
         6 . A composition of  claim 1  in which the dicamba salt is potassium or a dimethylamine, monoethanolamine, dimethylethanolamine, choline or diglycolamine salt. 
     
     
         7 . A composition of  claim 1  which includes at least one cosolvent in amounts between about 20 g/L and about 200 g/L. 
     
     
         8 . A composition of  claim 1  which includes at least one efficacy enhancing surfactant in amounts between about 20 g/L and about 200 g/L. 
     
     
         9 . A composition of  claim 1  which includes a second auxin type herbicide including chlorophenoxy acids such as 2,4-dichlorophenoxy acetic acid [2,4-D], 2,4-dichlorophenoxy butyric acid [2,4-DB], (4-chloro-2-methylphenoxy)acetic acid [MCPA] or 4-(4-chloro-2-methylphenoxy)butanoic acid [MCPB]; pyridine carboxylic acids such as picloram, aminopyralid, fluroxypyr, clopyralid or triclopyr; or quinoline carboxylic acids such as quinmerac or quinclorac. 
     
     
         10 . A method of controlling undesirable vegetation in crops that are resistant or tolerant to both glyphosate and dicamba which comprises applying to the undesirable vegetation and the crops that are resistant or tolerant to both glyphosate and dicamba a water-diluted composition of any one of  claims 1 - 9 .