Weeds & Invasive Plants

All Weeds & Invasive Plants Content

Two pictures of green grass demonstrating their physical differences.

Preemergence Crabgrass Herbicide Decisions

The optimal application window for preemergence herbicides to manage crabgrass in turf is normally during April, and earlier in the month during warmer years.

Field of green soybean plants with green corn and blue sky in the background.

Performance of Enlist One (2,4-D) and Liberty (Glufosinate) Applied in Mixture or Sequentially for Weed Control in Soybean

Trial results for Enlist One (2,4-D) and Liberty (Glufosinate) on weed control in soybean.

A sprawling sorghum field ready for harvest

Sorghum Weed Control

Early competition, especially from grass, is critical for successfully controlling weeds in sorghum. There are preemergence as well as postemergence herbicides available for this crop. Early treatment provides the best control of broadleaved weeds with crop stage also being a critical factor for some postemergence treatments.

Greenhouse bench containing plants in potted substrate exhibiting death (brown plants) and survival (green plants) after herbicide treatment.

SDSU Research Update on Herbicide Resistance Screening

SDSU Extension's herbicide resistance screening has been gathering valuable information on regional resistance patterns across South Dakota. Results will help guide herbicide selection, tank-mix strategies, and resistance management programs for growers.

Field of green soybean plants with green corn and blue sky in the background.

EPA Approves Dicamba for Over-the-Top Applications in Tolerant Soybean in 2026 and 2027

The Environmental Protection Agency has issued a limited-time registration of over-the-top use of dicamba on tolerant cotton and soybean for two growing seasons, 2026 and 2027.

Sprayer in a field with a blue sky and wispy clouds on the horizon
Apr 15

Private Applicator Training for Crops

SDSU Extension will host a free private applicator training for crops on April 15, 2026, from 1:30 - 4:30 p.m. CT (12:30 - 3:30 p.m. MT). Participants have the option to attend online or at various locations across the state.

grass with field bindweed, a viny green weed with white flowers

Weed Control: Noxious Weeds

Weed control recommendations for noxious weeds in South Dakota.

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.

A herd of cattle gather around a stock pond on a vast, lush grassland. Courtesy: USDA [CC BY 2.0]

Weed Control: Pasture and Range

There are many undesirable plants or invasive plant species in South Dakota's 24 million acres of native and tame pasture range. This guide provides a summary of different herbicide suggestions and uses.

Yellow wheat field with green weeds throughout.

Weed Control Field Test Data

Data books to use as a reference to select appropriate herbicide(s) for row crops