Archive for the ‘Winter Annuals’ Category
If you suspect that you have herbicide resistant weeds in your fields, now is the time to collect seed and have it tested. This week I began my new role as the Weed/Herbicide Diagnostician with MSU Diagnostic Services. One of my main responsibilities is continuing the herbicide resistance screening that has been conducted in Christy Sprague’s laboratory the past several years. The Michigan Soybean Promotion Committee has agreed to continue to suplement the costs of this testing for soybean growers so that they may submit samples free of charge. Species that are eligible for the free testing include amaranth species (Palmer amaranth, common waterhemp, Powell amaranth), maretail/horseweed, common and giant ragweed, and common lambsquarters. A minimum of 5 plants with mature seed present should be collected, stored in a sealed paper bag and mailed or brought into Diagnostic Services (578 Wilson Rd., Room. 107, East Lansing, MI 48824-6469). Please also send in a completed form with your submission (MSPC resistance screen form).
The turn around time for results can be 2-3 months to allow us to clean samples, break seed dormancy, grow and treat seedlings in the greenhouse, and assess control.
Stay tuned as I develop some photos and other materials to ensure the best collection of samples.
Recently this topic has been in the MI news:
Consider collecting seeds from weed escapes if you think they may be resistant to herbicides -MSUE, Bruce MacKellar
Also, stay tuned for a video that Christy Sprague and I recorded with MSPC this week further detailing detecting and confirming resistance.
With a camera constantly at my fingertips I thought a spring review in photos would display what we have been up to lately.
Dr. Christy Sprague recently completed a 2 year study on the control of windgrass in winter wheat. As a result of this study she has produced a new extension bulletin with common windgrass information on properly identifying the weed and keys to successful management. You can find the new bulletin at MSUweeds.com in the Extension Publications section or by clicking on the image below.
Yesterday Christy Sprague and I traveled up into the thumb to Minden City, MI. Here we have a plot with a grower cooperator looking at windgrass (Apera spica-venti) control in winter wheat. Windgrass is a winter annual grass, so its growing season corresponds well to the wheat season. Today we applied four preemergence treatments and we will return to the sight when the windgrass is ~1″ tall to apply several post-emergence treatments. This will be the second year of this study. The results from the 2011-2012 season can be found on here on MSUweeds.com