Archive for the ‘Uncategorized’ Category

Horseweed the focus of new Extension publication

Thursday, December 1st, 2016

-E. Hill

Horseweed/marestail has been the #1 weed submitted to MSU Diagnostic Services for herbicide-resistance screening. In 2015, all samples screened were found to be resistant to glyphosate. In 2016, screens have only been completed for 6 of the 36 samples submitted, but all thus far were resistant to both glyphosate and the ALS inhibiting herbicides (e.g. FirstRate, Group 2). With wind dispersal making this problematic weed more and more widespread with each passing year it is important to be diligent about control. Just this past month Christy Sprague has published a new MSU Weed Science bulletin addressing this issue titled, “Herbicide-resistant horseweed (marestail) in Michigan: Keys to management in no-till soybean.” Check out the bulletin to see her latest recommendations.


New Extension Publication: “Tips for collecting weed seeds: Ensure your resistance sample gets tested”

Tuesday, March 29th, 2016

-E. Hill

In an effort to increase the quality of weed seed samples sent to MSU Diagnostic Services for herbicide resistance screening we have developed this brief, all-color publication”Tips for collecting weed seeds“. The most frequent weeds submitted include: horseweed/marestail, pigweeds/amaranths (Powell, Palmer, Redroot, Waterhemp), common ragweed, and common lambsquarters. Following the tips in this guide will give us the best chance of getting seedlings to germinate for the greenhouse bioassay.

Stay tuned for the results of this year’s herbicide resistance screening (with 47 samples submitted)!


2016 Weed Control for Field Crops now online!

Monday, February 1st, 2016

-E. Hill2016WG_Cover

In addition to the new 2016 Weed Control Guide for Field Crops (E-434) being available for purchase at the MSU Extension Bookstore, you can now also view it as a PDF on!

Check out the 2015 Research Results!

Friday, November 13th, 2015

-E. Hill

The 2015 MSU Weed Science Research Results have just been posted to The results for each study show our weed control ratings by species, any crop injury observed and crop yields when taken. The results also detail all of the application information.