- Author: Lynn M. Sosnoskie
- Author: Ted Webster
- Author: Stanley Culpepper
Since it was first identified in 2004, glyphosate-resistant Palmer amaranth has become the most significant weedy pest of cotton in the Southeastern United States. When acceptable control is not realized, and Palmer amaranth is allowed to set seed, population densities can become quite high in infested fields. For example, research conducted by the University of Georgia indicated that Palmer amaranth seed densities exceeded 35,000 seeds per m2 in a cotton field where the glyphosate-resistant biotype had been ineffectively managed.
To combat Palmer amaranth, some cotton growers in Georgia have resumed using pre-plant deep-tillage and in-crop cultivation in fields with high weed population densities....
A repost today from the Australian Herbicide Resistance Initiative. Int this snap shot, AHRI discusses new Monsanto technology called BioDirect (RNAi) for control of glyphosate-resistant weeds with glyphosate.
I'll admit that I don't know enough about this yet to have much a well-formed opinion on this (and I don't want to muck up the internet with a bunch of inaccurate info - ha!) so I'll just share the text and links below.
Do Monsanto have the next big thing?
I wanted to share a link today to a paper published by CAST, the Council for Agricultural Science and Technology. This paper, entitled "Herbicide-resistant weeds threaten soil conservation gains: finding a balance for soil and farm sustainablity", was released about a year ago and addresses one of the less obvious issues resistance imposes - soil erosion. This paper can be viewed or downloaded (free!) at the link above.
The development and adoption of effective postemergence...
Herbicides are defined as a chemical substance that is used to eliminate unwanted plants. This is a very general description and it is important to remember that herbicides differ with respect to when they are used (for example, pre-emergence or post-emergence), their activity (for example, contact or systemic), their selectivity (for example, grasses or broadleaves), and their mechanism of action (also known as: mode of action, site of action). (See this blog post about basic herbicide terminology:http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=5973)
What is a mechanism of action? The...
A quick post today to share a link to the California Weed Science Society Journal. Click here for a direct link to the January 2013 edition of the CWSS Research Update and News. This edition focuses on herbicide resistance and includes articles by UC Farm Advisors, UC Cooperative Extension Specialists, CSU-Fresno faculty, UC Davis researchers, and herbicide industry researchers :
- Introduction - Steve Orloff
- Selection pressure, shifting populations, and herbicide resistance - Lynn Sosnoskie and Brad...