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

A few small, green weed plants among a background of brown dirt, tan crop residue and green soybean plants.

Excess Moisture and Heat Will Likely Increase Weed Growth and Germination

With warmer temperatures on the horizon, crop growth and development is set to rapidly increase, and so is weed growth and germination. Learn some expert tips for scouting and managing later-emerging weeds.

Picture of multiple green plants and tan, corn residue with brown soil in the background.

Reminder: One herbicide in the postemergence application will likely not be effective

The SDSU Extension Weed Science Project is currently conducting a plethora of field research evaluating weed management in soybean. One study is investigating the effectiveness of 2,4-D and tank mixtures applied one time to 4-inch weeds.

People walk through rows of crops with nets

SDSU Extension hosting Integrated Pest Management Field School

July 08, 2024

South Dakota State University Extension will host an Integrated Pest Management Field School on July 23, 2024, by Volga.

Small, green weeds throughout with a brown yard stick showing the weeds’ height being 2.5 inches.

Postemergence Herbicide Applications Need to Happen Soon in Soybean

In soybean crops, postemergence herbicides should be applied to smaller weeds, but proper scouting is likely necessary before application. Learn everything you need to know before making an application this growing season.

Green plant with bright yellow flowers throughout.

Leafy Spurge Management in the Early Summer

Early summer and fall integrated management tactics are critical for leafy spurge management. Now is the time to consider implementing early summer management tactics for leafy spurge.

A red, tractor-mounted sprayer with its tank being flushed by a hose connected to a large truck.

Dicamba Cannot be Applied Postemergence in Dicamba-Tolerant Soybeans After June 20

With weather delaying the planting of soybean, the clock is ticking to spray dicamba before the cutoff date of June 20, 2024. Learn what application tactics might work best before the deadline.

Two pictures of bright, green plants with yellow flowers.

Leafy Spurge or an Imposter?

Leafy spurge is a statewide noxious weed that can be difficult to manage. However, are the recent yellow flowers appearing throughout South Dakota landscapes leafy spurge or another species?

Producer with tablet observing a field in late autumn.

Critical Period of Weed Control: A good, but not perfect guideline

The critical period of weed control is the period during a crop lifecycle when weeds need to be managed to avoid a significant yield loss.

A picture of a absinth wormwood plant that has white colored leaves.

Absinth Wormwood Control in the Spring

Absinth wormwood is a difficult-to-control, noxious weed that can produce great amounts of seed (50,000 seeds per-stem) and spreads only by seed, illustrating the importance of management prior to seed production.

Various weeds emerging from a research plot in some rows, while other rows are weed-free.

Weeds Are Starting to Emerge: Even After a Preemergence Herbicide Application

During recent scouting, weeds were noticed in plots treated with preemergence herbicides. Learn some troubleshooting considerations to help determine why some weeds emerge following preemergence treatments.