Control of phenoxyalkanoic acid herbicide-resistant weeds with 4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)pyridine-2-carboxylic acid and its salts or esters

• US 8,673,817 B2
• Filed: 11/04/2011
• Issued: 03/18/2014
• Est. Priority Date: 11/05/2010
• Status: Active Grant

• Current Assignee: Corteva Agriscience LLC (Corteva, Inc.)
• Original Assignee: Dow Agrosciences LLC (Corteva, Inc.)
• Inventors: Satchivi, Norbert M., Schmitzer, Paul R.
• Primary Examiner(s): Epps-Smith, Janet
• Assistant Examiner(s): Buckley, Audrea
• Application Number:
  US13/289,008
• Publication Number:
  US 20120115727A1
• Time in Patent Office: 865 Days
• Field of Search: 504/260
• US Class Current: 504/260
• CPC Class Codes: A01N 39/04 Aryloxy-acetic acids; Derivatives thereof
• CPC Class Codes: A01N 43/40 six-membered rings

Abstract

4-Amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)pyridine-2-carboxylic acid and its salts or esters effectively controls phenoxyalkanoic acid herbicide-resistant weeds despite having the same mode of action as phenoxyalkanoic acid herbicides.

Claims

1. A method of controlling the growth of weeds that are resistant to phenoxyalkanoic acid herbicides, wherein the weeds are corn poppies, comprising contacting the weeds or a locus of the weeds with an herbicidally effective amount of 4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)pyridine-2-carboxylic acid or a salt or ester thereof.

2. The method of claim 1 in which the 4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)pyridine-2-carboxylic acid or the salt or ester thereof is applied at a rate from about 4 gae/ha to about 70 gae/ha.