Low volatility auxin herbicide formulations

a technology of auxin herbicide and low volatility, which is applied in the direction of biocides, herbicides and algicides, botany apparatus and processes, etc., can solve the problems of inability to successfully regulate the movement of auxin herbicides from the application site, volatile and drift, contact damage to sensitive plants, etc., and achieve the effect of reducing the volatility of auxin herbicides

Inactive Publication Date: 2012-06-07
MONSANTO TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]The present invention is further directed to a method of reducing the volatility of auxin herbicides. The method comprises providing a nitrogen containing polybasic polymer source for use in preparation of an aqueous herbicidal application mixture comprising an auxin herbicide for application to auxin susceptible plants. The auxin herbicide content of said auxin herbicide consists essentially of the salts of one or more auxin herbicide species. The polybasic polymer has a molecular weight from 600 to 3,000,000 Daltons and has a nitrogen content from 10 to 50 percent by weight.
[0015]The present invention is yet further directed to a method of counseling a person responsible for control of auxin susceptible plants. The method comprises (i) identifying an auxin herbicide source to be used in the preparation of an aqueous auxin application mixture, the auxin herbicides contained in said auxin herbicide source consisting essentially of one or more auxin herbicide salt species, (ii) identifying a nitrogen containing polybasic polymer source comprising at least one polybasic polymer species, wherein the polybasic polymer has an average molecular weight of from 600 to 3,000,000 Daltons and has an average nitrogen content of from 13 to 50 percent by weight and (iii) enabling said person to prepare said aqueous auxin application mixture from materials comprising said auxin herbicide source and said nitrogen containing polybasic polymer source for application to said auxin susceptible plants.

Problems solved by technology

Volatility and drift problems are commonly associated with auxin herbicides.
Volatile auxin herbicides can, under certain conditions of application, vaporize into the surrounding atmosphere and thereby migrate from the application site to adjacent crop plants, such as soybeans and cotton, where contact damage to sensitive plants can occur.
Prior art solutions to volatility and drift have failed to successfully regulate off-target dicamba movement from the application site.
Problematically however, crop plants such as soybean and cotton or sensitive plants such as vegetables and flowers located in an area wherein CLARITY or BANVEL has been applied can still exhibit symptoms of injury such as leaf cupping, leaf malformation, leaf necrosis, terminal bud kill and / or delayed maturity.
However, the resulting particle sizes are typically not suitable for spray application therefore limiting use to granular drop application.
Microencapsulation in a polymer shell is also known in the art, but the relatively high solubility of dicamba and its salts precludes successful use of that technology in aqueous suspensions and commercial dicamba microencapsulation products have not been developed.

Method used

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  • Low volatility auxin herbicide formulations
  • Low volatility auxin herbicide formulations
  • Low volatility auxin herbicide formulations

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0157]An experiment was performed to determine the efficacy of experimental application mixtures prepared by aqueous dilution of experimental MEA dicamba salt formulations containing a surfactant relative to comparative application mixtures prepared by dilution of the commercial products CLARITY and BANVEL.

[0158]Aqueous formulations comprising MEA dicamba were typically prepared by mixing water and monoethanolamine for 5 min followed by addition of dicamba acid (98.3% purity) in one portion. The resulting suspensions were stirred until all of the solids had dissolved by visual inspection, typically between 60 min and overnight. Relative amounts of dicamba and MEA used to give 61% by wt solutions of dicamba are reported in Table 1a. These and MEA dicamba solutions prepared using this procedure were subsequently used in preparation of MEA dicamba formulations containing polyimine polymers and / or surfactants.

TABLE 1aDicamba WaterMEADicambamol eqwt %(g)(g)(g)MEA:dicamba61108.2881.45310....

example 2

[0186]Aqueous formulations comprising MEA dicamba and various coco and tallow di- and tri-amine ethoxylates were prepared as indicated in Table 2a wherein the dicamba concentration in each formulation was 633 g a.e. / ha (47.9 wt % a.e.) and the concentration of the other components in wt % is indicated in parenthesis.

TABLE 2aFormulation504A3F504B5T504C8N504D3JMEA Dicamba61616161SurfactantSurf9 (10)Surf10Surf11Surf12 (10)(wt %)(10)(10)Formulation504E7C504F2I504G0L504H6TMEA Dicamba61616161Surfactant Surf13Surf14Surf15Surf16 (10)(wt %)(10)(10)(10)Formulation504I8L504J4P504K1B504L9OMEA Dicamba61616161SurfactantSurf17Surf18Surf19Surf20 (10)(wt %)(10)(10)(10)Formulation504M6K504N5U504O7X50P1FMEA Dicamba61616161SurfactantSurf21Surf22Surf23Surf24 (10)(wt %)(10)(10)(10)Formulation504Q3D504R6E504S9M504T7QMEA Dicamba61616161SurfactantSurf25Surf26Surf27Surf28 (10)(wt %)(10)(10)(10)

[0187]The formulations from Table 2a and CLARITY were sprayed over the top of velvetleaf (ABUTH) plants evaluate her...

example 3

[0189]The specific gravity and pH of potassium and MEA dicamba aqueous solutions were evaluated. The results are reported in Table 3a wherein “Dicamba wt %” refers to weight percent acid equivalent dicamba in solution and “SG” refers to specific gravity in grams per mL. The pH of MEA dicamba was measured for two lots of material.

TABLE 3aK DicambaMEA DicambaDicamba wt %SGpHSGpHpHg a.e. / L51.035.41.026.68.3—101.055.41.056.78.4—151.095.41.076.88.5—201.125.91.096.98.55—251.156.31.1278.6—301.186.51.147.18.65291351.226.81.177.38.7391401.2571.27.48.8478451.297.31.237.58.85554501.337.61.257.68.9623551.367.81.287.78.95684601.48.11.317.89741

[0190]The data indicate that solutions of potassium dicamba have a greater specific gravity and lower pH at a given concentration than do solutions of MEA dicamba.

[0191]In a set of experiments, the crystallization behavior of formulations containing MEA dicamba, potassium glyphosate and a surfactant was evaluated. The formulation of the experimental dicamba...

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PUM

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Abstract

Low volatility dicamba herbicide formulations are described. In some embodiments, concentrate formulations comprising dicamba monoethanolamine salt, dicamba potassium salt, or mixed dicamba salts are provided. In other embodiments, a dicamba salt is combined with a polybasic polymer.

Description

FIELD OF THE INVENTION[0001]The present invention generally relates to low volatility auxin herbicide formulations.BACKGROUND OF THE INVENTION[0002]Auxin herbicides have proven to be effective and highly beneficial for control of unwanted plants. Auxin herbicides include 2,4-D (2,4-dichlorophenoxyacetic acid), 2,4-DB (4-(2,4-dichlorophenoxy)butanoic acid), dichloroprop (2-(2,4-dichlorophenoxy)propanoic acid), MCPA ((4-chloro-2-methylphenoxy)acetic acid), MCPB (4-(4-chloro-2-methylphenoxy)butanoic acid), aminopyralid (4-amino-3,6-dichloro-2-pyridinecarboxylic acid), clopyralid (3,6-dichloro-2-pyridinecarboxylic acid), fluoroxypyr ([(4-amino-3,5-dichloro-6-fluoro-2-pyridinyl)oxy]acetic acid), triclopyr ([(3,5,6-trichloro-2-pyridinyl)oxy]acetic acid), diclopyr, mecoprop (2-(4-chloro-2-methylphenoxy)propanoic acid) and mecoprop-P, dicamba (3,6-dichloro-2-methoxybenzoic acid), picloram (4-amino-3,5,6-trichloro-2-pyridinecarboxylic acid), quinclorac (3,7-dichloro-8-quinolinecarboxylic aci...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A01N37/10A01P13/00
CPCA01N25/32A01N37/40A01N25/22A01N57/20
Inventor WRIGHT, DANIEL R.ROSKAMP, ERIC J.BRINKER, RONALD J.
Owner MONSANTO TECH LLC
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