- Author: Brad Hanson
Earlier this year, Lynn posted an explanation of herbicide modes of action and what that means for herbicide resistance management in orchards and vineyards.
I thought to myself "Self, we should put this in a table so it would be easy to understand". Then I remembered that we actually did this already in one of the four glyphosate resistance publications that I mentioned in an August posting.
Here's an excerpted table from ANR Publication 8501 "Preventing and Managing Glyphosate-Resistant Weeds in...
- Posted by: Gale Perez
Abstract: Reduction in herbicide use in non-agricultural areas is being imposed by a growing number of governments, triggering the development of alternative strategies for weed prevention and control. This study aimed to determine the weed preventive abilities of different paving types, the required treatment frequency of non-chemical weed control scenarios on these pavements and the associated weed species composition. A test parking area, constructed with four concrete paving types, was sown with a mixture of dominant weed species. Six scenarios with repeated use of a single weed control method (brushing with waste removal, hot air, selective application of hot water and three scenarios with flaming) and two...
- Author: Franz J.A. Niederholzer
- Author: John A Roncoroni
Saving Glyphosate
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: Guy B Kyser
After making a bunch of extension presentations, and following our 2012 publication of “Preemergent control of medusahead on California annual rangelands with aminopyralid” (Rangeland Ecology & Management 65:418-425), I’ve talked with quite a few ranchers who have successfully used Milestone® preemergence at 7 to 14 oz/acre to control medusahead. (See this blog post.) I should note here that 7 oz of Milestone is the maximum broadcast rate; 14 oz is labelled only for spot treatments.
Recently, Matt Rinella (USDA-ARS, Montana) found that aminopyralid controls seed set in medusahead in the greenhouse. He previously demonstrated this effect for...
- Author: Brad Hanson
Weed Science CE Specialist position available at UC Riverside:
The Department of Botany and Plant Sciences invites applications for an Assistant Cooperative Extension Weed Specialist (11-month tenure-track, 90% CE, 10% OR). The Weed Specialist will work with county-based CE Advisors, other Extension Specialists, faculty, land managers and the industry to conduct research on biology of weedy and invasive plants and their interactions with managed ecosystems, focusing on urban systems. Research could address potential invasiveness of ornamental or biofuel crops; environmental issues associated with herbicide use and other weed control practices; development of integrated weed management practices in nurseries,...