Soybean Weeds

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soybean pods

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

Leafy spurge growing along the edge of a field.

Leafy Spurge Control in the Fall

Leafy spurge is a difficult-to-control, noxious weed in South Dakota. Spring and fall herbicide applications are critical for leafy spurge management.

Canada thistle growing along field’s edge.

Canada Thistle Control in the Fall

Canada thistle begins to transport assimilates and nutrients down its roots in the fall to survive the winter months. Now is the time to consider a fall herbicide application to keep it under control.

Absinth wormwood growing in a field.

Absinth Wormwood Control in the Fall

Absinth wormwood is a difficult-to-control, noxious weed in South Dakota. Now is the time to consider fall applications for absinth wormwood control.

Yellow toadflax in the reproductive-flowering stage.

Yellow Toadflax Control

Yellow toadflax is a short-lived perennial plant that infests pasture and rangeland. If not controlled, it can displace native plant species and increase the potential for soil erosion. Learn some tactics for managing it.

Long, sharp bracts on a flowering female Palmer amaranth plant.

Palmer Amaranth Infestations Have Been Reported in South Dakota

Recent reports of Palmer amaranth infestations are concerning due to its aggressive growth, seed production, and resistance to multiple herbicide groups. Learn some management tactics to help control it before it becomes a serious problem.

Common ragweed and kochia growing along a road ditch.

Late-Season Weed Management

At this time during the growing season, many herbicides cannot be applied to crops in the reproductive growth stage. However, weed management can still be implemented. Learn some expert tips for controlling late-season weeds.

Green soybeans with a few green weeds throughout.

The Value of a Preemergence Herbicide After a Dry Period During the Growing Season

Preemergence herbicides are an essential component of weed management, even when early season weather isn't cooperative. Learn about some of the benefits they can offer following a dry growing season.

Tractor spraying soybean.

Herbicide Resistance Detection in the Field

Have you noticed weeds surviving a typically lethal herbicide application? There’s a chance they’ve developed herbicide resistance. Learn some expert tips for detecting and confirming resistance in fields.

Kristine Lang and Rhoda Burrows look at some plants with two men inside a high tunnel

The South Dakota State University Southeast Research Farm to host Field Day on July 11

June 30, 2023

The South Dakota State University Southeast Research Farm Field Day will be held on July 11 near Beresford, South Dakota.

Soybean field in early summer.

Dicamba Cannot Be Applied Postemergence in Dicamba-Tolerant Soybeans After June 20. Now What?

While you may have purchased dicamba to use in soybeans, applying it past the deadline is illegal. Learn about some other viable postemergence herbicide options for soybeans now that the deadline has passed.