Skip to main content Skip to navigation

New Extension Publication on BMPs for Managing Herbicide Resistance

Posted by Blythe Howell | December 10, 2020

Herbicide resistance has been a focus of WSU Weed Science for several years. The overreliance on herbicides for weed control has brought us to a situation where we are quickly running out of effective herbicide options for some of our most problematic weeds. The only way to slow the loss of effective herbicides is to adopt integrated weed management approaches for weed control.

Best Management Practices for Managing Herbicide Resistance (PNW754) is a new regional extension publication that presents growers and farm managers with best management practices (BMPs) that can be incorporated into farming systems to manage herbicide resistance. The graphics-heavy, 12-page publication can be used as a go-to resource for developing an integrated weed management plan for your farming operation.

""


Drew Lyon.
For questions or comments, contact Drew Lyon by email at drew.lyon@wsu.edu or by phone at 509-335-2961.

2 thoughts on "New Extension Publication on BMPs for Managing Herbicide Resistance"

  1. Drew Lyon says:

    Yellow nutsedge is an aggressive perennial weed that is difficult to control once it is established. While I have not worked on yellow nutsedge, I have worked on several persistent perennial weed species, and I know that consistent persistence is the key to eventual control. You will not solve the problem quickly or easily, which is why preventing yellow nutsedge from getting established is the easiest and best recommendation, albeit in this case, too late.

    Yellow nutsedge thrives in low, damp soils, but once established, it can withstand drought. It has an extensive underground system of rhizomes and tubers (nutlets) that store large reserves of energy. An integrated weed management approach uses cultural, mechanical, and chemical strategies to optimize control. Growing a competitive crop like winter wheat can be helpful, as can planting in narrower rows to promote quicker shading of the ground. Yellow nutsedge is not tolerant of shade. Tilling will destroy germinating tubers and smaller nutsedge plants and move nutsedge tubers to the soil surface where they can dry out and be exposed to temperature extremes. There are not a lot of herbicide that are effective at controlling yellow nutsedge. Two that can be used in pulse production are S-metolachlor ( for example, Dual Magnum) and demethenamid-P (for example, Outlook; not labeled for use in dry pea). Glyphosate can be effective when applied to young actively growing plants, but is not translocated to the rhizomes and tubers when applied to older plants. Be sure to apply herbicides at the appropriate time and at the recommended rates. For more information on herbicides, use this link to the PNW Weed Management Handbook (https://pnwhandbooks.org/weed/problem-weeds/nutsedge-yellow-cyperus-esculentus-purple-cyperus-rotundus). You might also be interested in this publication from the University of California Cooperative Extension (http://www.cwss.org/uploaded/media_pdf/109-042_2003.pdf).

    You have a war on your hands. I wish you luck!

    Sincerely,

    Drew

  2. alamto says:

    Congrats & thanks DrewLyon.
    I have a problem with Yellow nutsedge how can I stop this little enemy on my fields?

Leave a Reply

Your email address will not be published. Required fields are marked *

Washington State University