Weeds & Invasive Plants
All Weeds & Invasive Plants Content
Be on the Lookout: Ventenata
Ventenata is an invasive annual grass that's an emerging threat to South Dakota rangelands due to its ability to exclude desired native species. Learn how to identify, report, and manage it before it becomes a problem in your area.
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.
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.
Be on the Lookout: Medusahead
Grassland managers are encouraged to be on the lookout for Medusahead, an invasive grass that can aggressively out-compete native species. Learn how to identify, report, and manage it before it becomes an issue.
Be on the Lookout: Bulbous Bluegrass
Bulbous bluegrass is a resilient, invasive grass that can tolerate a wide variety of environmental conditions. Learn how to identify and manage it before it impacts forage production.
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.
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.
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.
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.
Knowing the Soil Types in Your Fields Can Increase Weed Control
As soil temperatures increase, many farmers are beginning to plant crops and start preemergent weed control. Learn the important role that soil type can play in getting the most out of preemergence herbicide applications.