Current Newsletters

Early management is important for horseweed control in soybean

Glyphosate-/multiple-resistant horseweed (marestail) is fairly common in many of Michigan’s no-till soybean fields. In fact, of the 12 horseweed samples that we tested this winter for resistance all showed some sort of resistance. Nine were multiple-resistant to glyphosate (Group 9) and ALS-inhibiting herbicides (Group 2), two were resistant to glyphosate only, and one was resistant to the ALS-inhibitors only. Because of resistance problems...

 

Posted April 30, 2015

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2015 Status of herbicide resistant weeds in Michigan

Each fall we receive several weed seed samples from around the state to test for resistance to various herbicides. All testing is conducted by the weed science group within the Department of Plant, Soil, and Microbial Sciences at MSU and is sponsored by the Michigan Soybean Promotion Committee. In 2014 we received samples of redroot pigweed (1), Palmer amaranth (2), common waterhemp (5), common ragweed (7), common lambsquarters (2), and horseweed/maretail (15). Each sample received is tested for resistance to five or six herbicide Sites of Action. 

 

Posted April 23, 2015

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Herbicide options for weed control in winter wheat

Most of the 2015 wheat crop faired considerably well over the winter. Over the next couple of weeks, many of these acres will be treated with herbicides for weed control. While there are several herbicide options available for use in wheat, there are many factors that growers should consider prior to deciding when to spray and what products to use.

 

Posted April 23, 2015

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