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New Herbicide-Resistant Kochia Montguide Available
Information for this article comes from Montguide MT 201806AG. Authors include Dr. Prashant Jha from MSU Southern Agricultural Research Center and group of County Extension Agents from the Golden Triangle. The complete document is available online or at the Chouteau County Extension Office. Our office is located in the green building next to the courthouse.
Herbicide -resistant plants often develop from repeated use of a single mode of action herbicide. Plants can develop resistance to additional herbicides, and then require integrated, and more costly management techniques. As of February, 2018, glyphosate-resistant Kochia has been identified in Glacier, Toole, Pondera, Teton, Liberty, Chouteau, Hill, Blaine, Phillips, Custer and Bighorn Counties.
All Integrated Pest Management recommendations are available in the Montguide. Herbicide options for glyphosate-resistant kochia control in a wheat-fallow rotation include the following:
• Wheat: Talinor/Huskie 15 ounces mixed with Starane at 4 ounces. Treatment includes groups 27, 6, and 4.
• Wheat: Starane NXT at 27.4 ounces mixed with NIS at 0.5%. Treatment includes groups 4 and 6.
• Wheat: Bronate Advanced at 25.6 ounces mixed with Carnivore at 1.5 pints). Treatment includes groups 4 and 6.
• Burndown: Gramoxone SL mixed with 32-48 ounces per acre). Treatment includes group 22.
• Burndown: Sharpen at 2 ounces mixed with 2,4-D LV4 ester at 8 ounces. Treatment includes groups 14 and 4.
• Burndown: Kochiavore at 2.5 pints per acre. Treatment includes groups 4 and 6.
Herbicide Options for glyphosate-resistant kochia control in wheat-pulse rotation include:
• Wheat: Starane NXT at 27.4 ounces per acre. Treatment includes groups 4 and 6.
• Wheat: Bronate Advanced at 25.6 ounces per acre mixed with Carnivore at 1.5 pints per acre. Treatment includes group 4 and 6.
• Burndown: Gramoxone SL at 32-48 ounces per acre. Treatment includes group 22.
• Burndown: Sharpen at 2ounces per acre mixed with 2,4-D LV4 ester at 9 ounces per acre.
Treatment includes groups 14 and 4.
• Burndown: Kochiavore at 2.5 pints per acre. Treatment includes groups 4 and 6.
Growers who suspect a glyphosate-resistant weed population should contact their local MSU Extension office for instructions on submitting a sample for testing. Testing is offered as a free service through the MSU-Southern Ag Research Center Weeds Lab: 748 Railroad Highway Huntley, MT 59037 Phone: 406-348-3400 Email: pjha@montana.edu.
Montana State University U.S. Department of Agriculture and Montana Counties Cooperating. MSU Extension is an equal opportunity/affirmative action provider of educational outreach.
