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

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.

Three green plants that showcase A) waterhemp, B) redroot pigweed, and C) common lambsquarter.

Weeds Have Started to Flower!

Early-flowering waterhemp, redroot pigweed, and common lambsquarters show the importance of early weed control, as they can produce seeds before a delayed postemergence herbicide application.

Plant Profiles: Palmer Amaranth, Waterhemp, and Pigweed.

Vegetative Identification of Palmer Amaranth, Waterhemp, and Redroot Pigweed

Palmer amaranth is a non-native weed sharing common characteristics with waterhemp and redroot pigweed. Learn how to identify all three of these aggressive weeds before they become an issue in your fields this growing season.

A red sprayer in a green field with a cloudy sky in the background.

June 20 Was the Last Day to Apply Dicamba Postemergence in Dicamba-Tolerant Soybean in South Dakota

The cutoff date to apply dicamba postemergence was June 20, 2023. Eric Jones, Assistant Professor and SDSU Extension Weed Management Specialist, shares some important updates now that the deadline has passed.

Tractor with sprayer applying postemergence herbicide to soybeans.

Considerations for Postemergence Herbicides

Postemergence herbicide applications can protect your crop yields by limiting in-season weed competition. Learn everything you need to know before firing up your sprayer.

Tractor applying preemergence herbicide on a freshly planted field.

Considerations for Preemergence Herbicides

Weeds emerging with crop plants have the potential to reduce yields. Learn some tips for applying preemergence herbicides to control weeds before emergence to ensure that your yields aren't limited by early-season weeds.