Weeds & Invasive Plants

All Weeds & Invasive Plants Content

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.

Top: Field pennycress leaves and seeds. Bottom: Shepherd’s purse leaves and seeds.

Early Season Prevalence of Field Pennycress and Shepherd’s Purse

Many fields that are planted to winter wheat or have yet to be tilled may have a healthy infestation of field pennycress or shepherd’s purse. Learn some expert tips for identifying and managing these weeds before they become a problem this growing season.

Canada thistle growing in a pasture.

Current State of Noxious Weed Management in South Dakota

Results of an online survey to determine how South Dakota stakeholders are currently managing noxious weeds.

A collection of empty pesticide and herbicide containers.

Herbicide Group Classification

The intent of providing herbicide group numbers and mode/site-of-action information on labels is to help develop herbicide plans that reduce the selection pressure on herbicide-resistant weeds. Learn how understanding this information can help improve your plans.

Nozzle on a boom sprayer in a crop field.

Factors Influencing Spray Coverage

Learn about the different factors that influence spray coverage and how you can tailor your practices to ensure that proper coverage is achieved.

Tractor-mounted wick applicator applying herbicide to a pasture.

Low-Cost and Adaptable Plans to Build a Wick Applicator for Herbicides

From crop fields to home gardens, wick applicators can manage weeds by applying herbicides directly to weeds growing at a set height above desirable plants. Learn how to build one yourself in this article.

Tractor spraying pre-emergent herbicide in a bare field.

Preemergence Herbicide Application Considerations for 2024

Preemergence herbicides control germinating weeds, which minimizes early-season competition with crops to keep yield potential higher. Learn what factors influence their effectiveness and what can be done to avoid control failures and unintended crop injury.

Field pennycress, common ragweed, and kochia weeds emerging in early spring.

Early Emerging Weeds and Effective Management

Managing early emerging weeds before crop planting or emergence is important to minimize early season competition, which can lower yield potential, even if the weeds are managed later in the season. Learn some tips for getting started.

Row of young corn plants in dry soil.

Herbicide Carryover Concerns for 2024

Herbicides with residual activity have great utility for weed management. However, due to environmental conditions, some herbicides can persist so that the crop grown next year can be injured.

Soybean field in early spring.

Conventional Soybean Weed Management

Compared to GMO soybean varieties, weed management in conventional soybean is more difficult and requires more planning to be successful. Learn some expert tips for getting conventional soybeans off to a great start.