Archive for the ‘Summer 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.
Recently Karen Renner has begun working with MSU’s soil biologist, Lisa Tieman, to explore how cover crops influence the microbiology of the soil and weed seeds. Last week we put tiny mesh bags of weed seeds into an incubation experiment hoping to gain some preliminary information. It is always exciting when different disciplines come together to try to understand a system. After one week of our bags being in the incubators we had some germination and growth of giant foxtail and velvetleaf. We removed the seedlings (pictured below), but it will be interesting to see if germination correlated to any of the factors that Lisa and her team are measuring…stay tuned.
Last week the majority of our weed science research team attended the annual Weed Science Society of America meeting in Lexington, KY. We are pleased to report that in the first ever graduate student competition both of our graduate students placed. Jonathan Kohrt tool 1st place amongst the Ph.D. candidate posters and Amanda Goffnett placed 2nd amongst the M.S. student posters. Congratulations to you both! These posters and more from the meeting can now be found on MSUweeds.com/research/presented-research
Earlier this month MSU weed scientist, Christy Sprague, published and article for the Progressive Forage Grower titled, “Palmer amaranth: Managing this new weed problem.” This article details the characteristics and biology of this herbicide-resistant weed and discusses management considerations specific to alfalfa.