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Got weeds? U of M Extension has resources

Managing herbicide resistance and controlling resistant weeds is a challenge. The U of MN Extension Crops Team is offering new video and web resources to help manage these difficult to control weeds:
  • Weed management website – includes resources on herbicide resistance management, weed identification, herbicide application and chemistry, and research reports.
  • Herbicide resistant waterhemp (video) – Waterhemp has an extended emergence pattern, making it difficult to control. Results from a 2015 trial demonstrating the effectiveness of layering residual herbicides for herbicide-resistant waterhemp control are shown in this video.
  • Herbicide resistant giant ragweed (video series) – Due to its large seed and early emergence, giant ragweed can be difficult to control. This video series describes a study looking at alternative management practices to control this herbicide-resistant weed.

To see additional videos from the U of M Crops Team, visit:

Here are some highlighted videos that may be useful now:

Herbicide resistant waterhemp

Herbicide resistant waterhemp: A layered approach
Waterhemp has an extended emergence pattern, making it difficult to control. In addition, some populations are resistant to glyphosate (SOA-9) and ALS (SOA-2) herbicides, limiting control options. A 2015 trial demonstrated the effectiveness of layering residual herbicides for waterhemp control and results are shown in this video.

Herbicide resistance management series

Herbicide resistance and mode of action basics
Dr. Jeff Gunsolus describes what herbicide resistance is and how it can occur. Herbicide mode of action and mechanisms for developing resistance are also introduced.

Herbicide mode of action breakdown
This second video in the Herbicide Resistance Management series focuses on how herbicides work. For each group of herbicides, the affected biochemical reaction, translocation, time of herbicide application and symptoms are described.

Herbicide resistance development by site of action
This third video describes how resistance develops with continued use of the same herbicides, the importance of developing a robust resistance management program and the need to diversify herbicide sites of action.

History of herbicide resistance throughout Minnesota
Dr. Beverly Durgan describes the history of herbicide resistance development in Minnesota, beginning with triazines in the 1980's to glyphosate resistance today.

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