NDSU Extension - Griggs County

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Feb 19

The Extension Connection Column by Jeff Stachler

Meetings and Kochia

Hello!  Hope all is well for you! 

Remember crop pest guides are now available at the office.

Here are some meetings to keep in mind.  NDSU will be offering the Livestock Drought Planning Webinar Series.  Register for this series of meetings at the following website:  https://www.ag.ndsu.edu/drought .  On February 17, 2021 NDSU will be hosting a soybean Getting-It-Right virtual meeting.  To register for this meeting visit the following website:  https://www.ag.ndsu.edu/carringtonrec/events .    Barley and Wheat commodity elections are nearly here.  This year there will be a virtual meeting before each election with both meetings starting at 9:00 AM and elections held at 10:00 AM.  The barley meeting is February 19, 2021 and the wheat meeting is February 23, 2021.  To register for the barley meeting go to https://tinyurl.com/D2barley .  To register for the wheat meeting go to https://bit.ly/2021ExtensionWheatUpdate .  Griggs County Pesticide Recertification is back!  There are two meeting date choices, one on February 23, 2021 starting at 12:30 PM and the other on March 18, 2021 starting at 9:00 AM.  To register for these pesticide recertification meetings, go to https://tinyurl.com/GriggsPrivate .  If you have questions about registering for any of these meetings feel free to contact the extension office at 701-797-3312 or e-mail the Agent at jeff.stachler@ndsu.edu.

NDSU Extension has put together a Spring Fever Garden Forum and I have decided to host it here in Cooperstown at the Courthouse.  The meeting will be virtual, but shown here at the County Courthouse on March 22, 29, and April 5 and 12, 2021 from 6:30 to 8:30 PM.  Please preregister by calling the extension office at 701-797-3312 or e-mailing the Agent at jeff.stachler@ndsu.edu. 

Kochia has always been a concern in North Dakota when managing weeds, but it has become more difficult in recent years.  Resistance to herbicides is the reason for the more difficult control now.  In North Dakota, kochia has been confirmed resistant to ALS inhibitor herbicides (Group 2), Growth Regulator herbicides (Group 4 – 2,4-D, dicamba, and Starane), Photosystem II Inhibitor herbicides (Group 5 and 7), EPSP synthase inhibitor herbicide (Group 9 – glyphosate), and resistance to Groups 2, 4, and 9 within the same plant! 

Last fall I conducted a survey of weed control in soybean fields in mid-September in parts of 5 townships in Griggs County to get a handle on weed populations in the county.  I rated the weed control as no weeds, a 1 meaning an occasional plant of a species, a 2 meaning a patch or patches of 8 or more plants scattered in the field or a 3 meaning numerous patches or individual plants spread throughout the field.  Only 21% of fields were weed free, but an additional 27% of fields only had three broadleaf plants within an entire field.  The most prevalent weed in soybean fields near harvest in 2020 was kochia at 35%.  The percentage of fields with a rating of 1 was 21.2%, for 2 was 11.5%, and for 3 was 1.9%.  The average rating of kochia in fields was a 1.44, the highest of all weeds.  This is a large concern to me especially since kochia tolerates high salt areas where there is no crop and that kochia easily breaks off at the base of the plant and starts rolling across fields spreading seeds.

To identify kochia look for short linear cotyledons (remnants of the seed).  The first two true leaves come out at the same time meaning they are oppositely attached and the leaves are very hairy.  Sometimes the next two leaves can come out in a pair as well, but all subsequent leaves emerge one leaf at a time.  True leaves are linear and short initially, but become longer as the plant ages.  The stem is grooved and branches very well at the base of the plant.

One positive aspect of kochia is that most seeds germinate the next growing season.

Herbicides providing excellent control include all HPPD inhibitors plus atrazine, sulfentrazone, Corvus, dicamba applied preemergence, Sharpen at 2 to 3 fluid ounces per acre, Verdict at 10 to 18 fluid ounces, atrazine at 0.5 to 0.75 pounds active ingredient per acre, Axial Star, DiFlexx Duo, Extreme, Huskie FX, Liberty, Raze, Starane NXT, and Supremacy.

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