Scouting will be key to stopping the spread of glyphosate-resistant Palmer amaranth in Michigan.
It has been almost three years (fall 2010) since Palmer amaranth resistant to glyphosate (Roundup) and ALS-inhibiting herbicides was first reported in Michigan. Initially, populations of this weed appeared to be localized to parts of St. Joseph and Kalamazoo counties. However, last summer more populations of Palmer amaranth were confirmed in nine Michigan counties: St. Joseph, Kalamazoo, Cass, Barry, Ionia, Clinton, Shiawassee, Gratiot, and Livingston. This weed is not native to Michigan and with resistance to glyphosate and other effective herbicides this weed is undoubtedly the toughest that Michigan growers have ever faced. In fact, in many Southern states where this weed is a problem it has been reported that the average increased cost to manage this weed ranges from $30 to $50 more per acre.
May 30, 2013
We invite you to make plans to attend the annual Michigan State University Weed Tour, beginning at the MSU Crops Field Lab on Wednesday, June 26th (Beaumont Road and Mount Hope Road on MSU Campus). Registration begins at 9:00 am, with the field tour kicking off at 9:30 am.
May 30, 2013
- NEW extension bulletins:
- Preliminary 2013 Weed Control Results are now available for viewing
- 2013 extension bulletin: Keys to distinguishing Palmer amaranth from other species
- Corn and soybean herbicides chart (Univ. of Wisconsin Extension)-This chart provides useful information about the mode of action of corn and soybean herbicides. Utilizing different modes of action can reduce the incidence of weed resistance.
Photos from the 2013 Weed Tour are posted on the blog