This article was originally prepared for the CWSS Research Update and News (September 2014 edition). You can see it and several other articles at the CWSS website. You can also get information on the annual California Weed Science Society Conference which will be held in Santa Barbara January 21-25, 2015.
Managing Junglerice in Tree Nut Crops – a summer weed resistant...
- Author: Brad Hanson
The risks of GMO herbicide-resistant crops as a source for resistance traits in weeds has garnered recent attention in discussions of so-called “superweeds”. [I've commented previously on my general disagreement with the term "superweed" when talking about herbicide resistance]. Some media reports and online sources have suggested that herbicide resistance can be caused by resistance “jumping” from the crops into weeds. In fact, at least one online dictionary defines the problem in these terms:
From the May 2014 Tulare County UC Cooperative Extension "Field Crop Notes" newsletter
Managing Junglerice in Corn
by Steve Wright and Carol Frate
Introduction. The summer annual grass weed junglerice (Echinocloa colona) has become a difficult problem to control in corn fields in the southern San Joaquin Valley, especially minimum till...
Glyphosate, the active ingredient in Roundup, is the most commonly used herbicide in California. Highly effective, safe for the user and the environment, and now inexpensive, glyphosate is a valuable weed management tool. How valuable? Imagine the cost of weed control if you couldn’t count on glyphosate!
Resistance–the inherited ability of a plant to survive and produce healthy seed after being sprayed with enough material to kill non-resistant plants of the same species–has developed to glyphosate in several weeds in California. These include rigid ryegrass, annual ryegrass, marestail (Horseweed), Hairy fleabane, and jungle rice. Glyphosate resistance is a...
- Author: Brad Hanson
One of the major research and extension areas in my program is weed control efficacy in orchards and vineyards. During the 2012-13 growing season, we conducted about 50 herbicide efficacy trials in commercial orchards or research station sites. Today I thought I'd share some data from 2012-13 orchard weed control efficacy experiments comparing various tank mixtures and sequential applications of Matrix (rimsulfuron) and Alion (indaziflam). This work was primarily funded by the Almond Board of California, Bayer CropSciences, and DuPont.
By way of background, both of these herbicides are residual products with different modes of action. Matrix is a group 2 herbide (ALS inhibitor) and Alion is a group...