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Herbicide Tolerant Kochia (06/28/18)

Kochia has been a weed control challenge for North Dakota growers for decades.

Herbicide Tolerant Kochia

Kochia has been a weed control challenge for North Dakota growers for decades. Kochia is extremely competitive, creating significant yield losses when only a few weed escapes occur in crop fields. In North Dakota, kochia is resistant to 2,4-D, MCPA and the ALS inhibitor herbicides (SOA 2). Consider all biotypes resistant to these herbicides or herbicide families when planning a weed management program.

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We are hearing about more biotypes resistant to glyphosate. In hindsight, glyphosate-resistant kochia populations in North Dakota should not have come as a surprise. Glyphosate (group 9) is often used as a burndown treatment before planting and / or applied POST in Roundup Ready® crops. Finally, there are reports of kochia surviving dicamba and Starane (fluoxypyr).

Growers with kochia will need to implement weed management plans across the crop sequence on their farms. However, what about plants that ‘roll-in’ from other areas? Dr. Zollinger often spoke of creating a “living fence” or one planter pass of corn or sunflower around the perimeter of field to trap kochia plants on the outside of fields. A critical weakness in kochia biology is most seed remains viable for only one year. Thus, two or three years of excellent season-long weed control can reduce kochia population in the seed bank.

 

Tom Peters

Extension Sugarbeet Agronomist

 

 

Sam Haugen

Grand Forks County ANR Extension Agent


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