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.

sun rising over South Dakota field

South Dakota Pest Management Guides

The South Dakota Pest Management guides are now available for free. The guides offer recommendations for controlling weeds, insects, and diseases in a variety of South Dakota crops.

All Soybean Weeds Content

Two photos of yellow soybeans, one with green and yellow weeds in between the rows and the other with a clearing in-between soybean rows.

Order of Fields Harvested Can Improve Weed Management

Weeds at harvest time are hard to avoid, and their severity in fields can range from “clean” to a “weedy mess.” Harvesting weedier fields last can help limit the movement of weed seeds and reduce future weed pressure.

Waterhemp growing at the edge of a soybean field nearing harvest.

Row Crop and Noxious Weed Surveys

Controlling noxious weeds and weeds in row crops is a challenge every year. SDSU Extension has created two online surveys to capture the current climate of weed control in South Dakota.

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.

aerial view of South Dakota farm and surrounding land

Crops

During the growing season, SDSU Extension provides weekly production recommendations.

Aerial view of test plots at the Volga Research Farm.

SDSU Extension to host Integrated Pest Management Field School on July 25

July 18, 2023

South Dakota State University Extension will host the 2023 Integrated Pest Management Field School from 9 a.m. until 4 p.m. CDT on July 25 at the SDSU Volga Farm south of Volga, South Dakota.