Crop & Pest Report



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Flag your Herbicide Trait (06/01/17)

Hey Dad, why is there a bicycle flag in the corner of our soybean field?” “Jimmy, it’s so our ag-retailer can verify they are spraying the herbicide matching our soybean variety.”

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Adjuvant Properties from Humic Acid (06/01/17)

Question: Humic acid is getting some 'play' in the countryside. I understand it is sourced locally, derived from North Dakota Leonardite shale. We heard from farmers that humic acid has been suggested as a herbicide adjuvant to increase the activity of and to improve the rainfastness of translocated herbicides. I understand the trade is suggesting humic acid at 1 pint per to the spray solution. Sometimes it is recommended alone, other times it is recommended with non-ionic surfactant.

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Controlling Seedling Alfalfa in Sugarbeet (05/25/17)

Field Agronomists have observed a greater than normal occurrence of seedling alfalfa in row crop fields.

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Actively Managing Nurse Crops in Sugarbeets (05/25/17)

Sugarbeet growers routinely plant cereals as a companion crop to reduce sugarbeet injury from blowing soil and wind.

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Crop Stage For Clethodim (05/25/17)

Question: A question on the clethodim labels. The labels restrict application to “prior to bolting” for both canola and mustards. Is the clethodim actually causing some damage at this stage or does it have to do with the MSO oil? I get this question quite often, “Why can’t I spray clethodim after bolting. All it does is kill grass?”

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Herbicide that has Been Frozen (05/25/17)

Question: I had a call about some Tordon that is 4 to 5 years old and to make it better yet, it had been frozen every winter. Is it still an active herbicide? Is there a rule of thumb for frozen herbicide?

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Herbicides Labeled on Faba Bean (05/25/17)

Interest in Faba production has increased, which has resulted in more questions about registered herbicides for weed control.

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Change in Use Area for Flexstar (05/25/17)

On March 3, 2017, the North Dakota Department of Agriculture issued FIFRA Section 24(c) Special Local Needs (SLN) registration ND-170001 to Syngenta Crop Protection LLC.

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Herbicide: Fungicide Combinations in Sugarbeet (5/18/17)

Rhizoctonia can cause damping-off of sugarbeet seedlings and root rot when soils are warm and moist. Control strategies include resistant sugarbeet varieties, seed treatments, and in-furrow fungicides.

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Waterhemp has Emerged in 2017 (5/18/17)

Waterhemp has emerged in Minnesota and North Dakota.

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Crop Safety from Products with Same Mode of Action (5/18/17)

Question: If I apply a soil-applied herbicide containing the active ingredient mesotrione (Callisto – Group 27) to my corn pre-emergence, can I follow with a post-application of Laudis (tembotrione – Group 27)? Will the two group 27 herbicides “overlap” on soil residual and cause crop safety issues or rotation restriction issues if used at labeled rates?

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Chemical Control of Cleavers/Catchweed Bedstraw (5/18/17)

Last week an article was included in the Crop & Pest Report identifying cleavers or catchweed bedstraw as an emerging weed in the state.

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Does Rye Residue Affect the Corn Crop? (5/18/17)

Question: Does rye breakdown residues (allelopathy) affect corn the same way quackgrass residue does? Can a grower plant corn after killing a fall planted cover crop of rye at 1/3 bu/A?

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Weed ID Resources (5/11/17)

“Weeds of the West” is a highly recommended book for weed identification. It can be purchased on-line from several sources. There are several web-based resources that can also help with weed ID. I suspect many of you have already book-marked sites that show common weeds found in ND. Below are a few other resources you may consider.

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zollinger cleaver

Cleaver/Catchweed Bedstraw Control (5/11/17)

Several reports show cleavers becoming more prevalent across northern North Dakota. Cleavers as known in Canada or Catchweed bedstraw (Galium aparine) as known in North Dakota is an annual and a winter annual resuming growth early in the spring.

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Absinth Wormwood Control (5/11/17)

Question: How can absinth wormwood be controlled in a newer alfalfa/grass pasture or CRP planting that he planted last year, but doesn’t want to kill the alfalfa. In looking through the alfalfa herbicides in the weed guide on pages 48-49 I see several herbicides recommended, such as Pursuit, Raptor, and 2,4 DB amine. They all indicate no wormwood control. Of the wormwood herbicides on page 65, how bad would Chaparral, Milestone or Tordon hurt the alfalfa?

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Preemergence Herbicides are a Proactive Approach for Weed Management (5/11/17)

Agriculturalists frequently advocate for use of preemergent herbicides. You heard state Extension Specialists recommend this in presentations during winter meetings and you have read it in trade magazines while you relax at home. Now it is time to put what you have heard and read into action. However, you are not so sure anymore, for some reason. The following evidence is intended to encourage you to apply herbicides preemergence.

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zollinger table

Crop Rotation Following Dicamba (5/11/17)

Review of the Banvel (generics) or Clarity labels may create questions when some rotational crops can be planted after dicamba application.

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Correction to Weed Guide (05/04/17)

Question: I have been getting questions left and right about Absinth wormwood control in pastures. I understand that there are recommendations in the ND Weed Guide that are not correct. What is the best time to control this weed, and what products/rates do we need to be using?

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Waterhemp Control in Sugarbeet (05/04/17)

Congratulations if you planted sugarbeet the week of April 9 and are starting to see emergence this week. Your sugarbeet crop should reach the 2-lf stage by approximately May 12th or timing for application of one of the chloroacetamide herbicides for waterhemp control.

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