Auxin herbicidal mixtures
AssigneeMonsanto Technology LLC
InventorsDaniel R. Wright, Junhua Zhang
Life of this patent
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Abstract
Herbicidal mixtures comprising an auxin herbicide and an adjuvant comprising a salt having a quaternary ammonium cation and/or a phosphonium cation are described. The adjuvant reduces the volatility of the auxin herbicide and/or counteracts the negative impact on the volatility of the auxin herbicide caused by the addition of a co-herbicide. Methods of preparing the herbicidal mixtures are also described.
Claims37
A method of preparing a herbicidal mixture, the method comprising:
- combining an auxin herbicide comprising a first cation and an adjuvant comprising a salt comprising a second cation, wherein the salt is selected from the group consisting of:
- (a) an ammonium salt of Formula I
- wherein R1, R2, R3, and R4 are independently a C1-C12 alkyl or benzyl and X is an agronomically acceptable anion;
- (b) a salt containing a nitrogen heterocycle of Formula II
- wherein A is a 5 or 6-membered heterocyclic ring;
- R5 is a C1-C20 alkyl;
- R6 is hydrogen or a C1-C6 alkyl, and X is an agronomically acceptable anion;
- (c) a phosphonium salt of Formula III
- wherein R7, R8, R9, and R10 are independently a C1-C12 hydrocarbyl and X is an agronomically acceptable anion;
- and mixtures thereof, wherein the herbicidal mixture has a total herbicide concentration no greater than about 40% by weight acid equivalent (a.e), and wherein the molar ratio of auxin herbicide to adjuvant salt (a), (b), and/or (c) is from about 1:1 to about 3:1.
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A herbicidal mixture, comprising:
- an auxin herbicide comprising a first cation and an adjuvant comprising a salt comprising a second cation, wherein the salt is selected from the group consisting of:
- (a) an ammonium salt of Formula I
- wherein R1, R2, R3, and R4 are independently a C1-C12 alkyl or benzyl and X is an agronomically acceptable anion;
- (b) a salt containing a nitrogen heterocycle of Formula II
- wherein A is a 5 or 6-membered heterocyclic ring;
- R5 is a C1-C20 alkyl;
- R6 is hydrogen or a C1-C6 alkyl, and X is an agronomically acceptable anion;
- (c) a phosphonium salt of Formula III
- wherein R7, R8, R9, and R10 are independently a C1-C12 hydrocarbyl and X is an agronomically acceptable anion;
- and mixtures thereof, wherein the herbicidal mixture has a total herbicide concentration no greater than about 40% by weight acid equivalent (a.e), and wherein the molar ratio of auxin herbicide to adjuvant salt (a), (b), and/or (c) is from about 1:1 to about 3:1.
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The herbicidal mixture of claim 83 wherein A is a substituted imidazole ring, a substituted pyridine ring, or a substituted pyrrolidine ring;
- R5 is C1-C12 alkyl;
- and/or
- the salt of Formula II is selected from the group consisting of 1-butyl-1-methyl-pyrrolidinium chloride, 1-ethyl-3-methylimidazolium chloride, 1-butyl-3-methylimidazolium chloride, 1-methyl-3-octylimidazolium chloride, cetylpyridinium chloride, and cetylpyridinium bromide.
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The herbicidal mixture of claim 84 wherein R7, R8, R9, and R10 are independently C1-C12 alkyl;
- and/or
- the salt of Formula III comprises tetrabutylphosphonium chloride.
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67-79. (canceled)
A method of reducing off-site movement of an auxin herbicide following application to the foliage of auxin-susceptible plants of a herbicidal mixture comprising an auxin herbicide, the method comprising:
- combining the auxin comprising a first cation and an adjuvant comprising a salt comprising a second cation, wherein the salt is selected from the group consisting of:
- (a) an ammonium salt of Formula I
- wherein R1, R2, R3, and R4 are independently a C1-C12 alkyl or benzyl and X is an agronomically acceptable anion;
- (b) a salt containing a nitrogen heterocycle of Formula II
- wherein A is a 5 or 6-membered heterocyclic ring;
- R5 is a C1-C20 alkyl;
- R6 is hydrogen or a C1-C6 alkyl, and X is an agronomically acceptable anion;
- (c) a phosphonium salt of Formula III
- wherein R7, R8, R9, and R10 are independently a C1-C12 hydrocarbyl and X is an agronomically acceptable anion;
- and mixtures thereof, to prepare the herbicidal mixture, and wherein the molar ratio of auxin herbicide to adjuvant salt (a), (b), and/or (c) is from about 1:1 to about 3:1 and the herbicidal mixture has a total herbicide concentration no greater than about 10% by weight a.e.;
- and
- applying the herbicidal mixture to the foliage of the auxin-susceptible plants.
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Dependencies are inferred from the claim text.