The old saying, “Everything's fine until it's not,” comes to mind when dealing with some tough to control perennial weeds in alfalfa production during the summertime. Such was the case for an alfalfa field in the Sacramento Valley, where weed control seemed good up until mid-summer, and then it wasn't. Perennial weeds that started off small and overlooked, grew through the season, persisting through multiple cuttings, including curly dock, plantain, and nutsedge. For tough to control weeds in alfalfa fields, one needs to determine: 1) What types of perennial weeds are present, and 2) How many of them are there, to make a decision on how to manage them. These sorts of weed issues can creep up quickly in older alfalfa...
- Author: Scott Oneto
This is a follow up article to a blog that my colleague, Guy Kyser wrote back in 2011 titled “Purple alert: Common Pokeweed”. Since that time, I probably get a dozen or so calls this time of year asking, “what is that huge weed growing in my yard with dark black berries and big green leaves.” Pokeweed!
I personally find this plant quite interesting. As a native to portions of the United States, it turns out this plant has a diverse history and in recent years it is being studied in cutting edge medical research and energy technology. Have I perked your interest? If so read on.
- Author: Brad Hanson
In late 2016 and early 2017, the Weed Science Society of America (WSSA) organized a series of seven "Herbicide Resistance Listening Sessions" around the country.
Brian Schutte (from New Mexico State University) and I co-hosted the Southwestern session in Tulare, CA on February 15, 2017 and, if you're a regular reader, this may sound vaguely familiar since I tried to drum up interest on the blog in November 2016 and Pratap shared
- Author: Lynn M. Sosnoskie
Glyphosate was commercialized in 1974. Since then, it has become one of the most widely used (and studied) herbicides. According to Duke (2018b), almost 20,000 scientific publications and patents have included glyphosate as a focus; only 2,4-D surpasses it with respect to citations. The articles in the 5th issue of the 74th volume of Pest Management Science all focus on glyphosate and arose from a day long symposium (which was also dedicated to the molecule) that was held at the 252nd annual meeting of the American Chemical Society (Duke 2018a).
Figure 1. The...