Soybean Weeds

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Best Management Practices for Soybean Production

This is your unbiased, research-based guide to soybean production to help increase yield, reduce input costs and protect your investment.

All Soybean Weeds Content

Green to yellow kochia plants within sixteen, separate black pots filled with brown soil. Green, white, pink and blue marker stakes are within the pots denoting treatments.

Dicamba-Resistant Kochia Can Likely Be Found Across South Dakota

Kochia populations collected across South Dakota have been subjected to an herbicide effectiveness screen, where a treatment of dicamba was applied and some kochia plants exhibited survival and regrowth after treatment.

Two small, green soybean plants with brown to yellow coloration on their leaf edges, indicative of herbicide damage. Tan sand and yellow fertilizer pellets are in the background.

Wind and Rain May Have Delayed Preemergence Herbicide Application: What Now?

With recent winds and rain, preemergence herbicide applications may be further delayed. Scouting to determine if crops and/or weeds have emerged is critical to ensure effective and safe application of preemergence herbicides.

A green leafy spurge plant with small, yellow bracts at top. Various brown and green plants surround the green leafy spurge plant.

Leafy spurge has germinated and is growing rapidly in South Dakota: Scout carefully!

Leafy spurge can reduce the value and productivity of pasture and displace desirable vegetation. Now is the time to scout for infestations to determine which management tactics will be most effective.

Corn plants and scattered weeds emerge from a dry, no-till field.

Dry Conditions May Hinder the Performance of Recently Applied Preemergence Herbicides

If a preemergence herbicide does not receive an activating rainfall, generally 0.5 to 1 inch of rain, many weeds will emerge, as the herbicide remains on the soil surface.

Ten small green pots with brown dirt and green kochia plants within with a black background.

Saflufenacil-Resistant Kochia Confirmed in South Dakota

Saflufenacil is an herbicide that can be applied at a burndown timing before most South Dakota crops to effectively manage kochia. However, overreliance on saflufenacil has selected for resistant kochia in our region.

Bull thistle, Canada thistle, and absinth wormwood emerging in early spring.

Noxious Weeds Have Germinated in East River South Dakota

Seasonal conditions have been favorable for weed germination, including biennial thistle, Canada thistle, and absinth wormwood. Learn some tips for scouting, identifying, and managing these noxious weeds before they become a problem.

Scattered weeds emerge from a no-till corn field in Kennebec.

Watch Temperature Forecast Before a Burndown Herbicide Application

As planting season approaches, no-till fields will likely need a burndown herbicide application to manage the established winter annual and early emerging summer annual weeds.

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2,4-D (Enlist One) and Glufosinate (Liberty) Additively Control Common Weeds in South Dakota Soybean Production

Fact sheet on the experiment to determine how 2,4-D and glufosinate, when applied alone or mixed, control common weeds and affect soybean yield.

Soybean field with volunteer corn stalks growing throughout.

Stalk Grazing to Combat Volunteer Corn

Fall aftermath grazing by livestock, particularly cows, can dramatically reduce the amount of volunteer corn in the field. Learn some key benefits that stalk grazing can bring to your operation.

Group of farmers strategizing near a field at sunset.

Now is Time to Plan Your Weed Management Strategy for the 2025 Growing Season

As harvest season comes to an end, now is the time to start formulating your weed management plan for next year. Learn some expert tips for getting your operation off to a good start next growing season.