- Author: Brad Hanson
Today I thought I would post a brief writeup and a poster presentation by Amit Jhala, a recent postdoctoral researcher in the UCD weed group. Amit and I put out two small experiments in the spring of 2010 to evaluate combinations of glyphosate (Roundup WeatherMax) plus various residual herbicides in a walnut orchard near Davis and a vineyard near Winters, CA.
All treatments included 2 lb ae/A glyphosate The residual materials included:
- penoxsulam (to be registered alone as "Tangent" and is one of the active ingredients in "Pindar GT")
- indazaflam (to be registered as...
- Author: Brad Hanson
I had the opportunity last week to attend the Weed Science Society of America (WSSA) annual meeting which was held in Portland OR this year. The meeting was really interesting as usual with many interesting oral and poster research presentations.
Two UCD weed scientists, Joe DiTomasso and Kassim Al-Khatib, were honored with the Society's Fellow Award - the highest level of recognition given by the group. More info on this award can be found here: http://www.wssa.net/WSSA/PressRoom/WSSA-2011-AwardWinners.htm
I've attached a research report presented by a UCD...
- Author: Brad Hanson
Reposted from a paper presented at the 59th annual Lodi Grape Day (February 1, 2011).
Brad Hanson, Cooperative Extension Weed Specialist, UC Davis
What makes a weed a weed? Better yet, what makes a weed a "tough weed"? Or even better still, what makes a tough weed tough to control? Confused yet?
One definition of agricultural weeds that I like is "a plant that is especially successful at colonizing and proliferating in disturbed, but potentially productive areas". Most vineyards fall into the category of "disturbed, but productive"...
- Author: Brad Hanson
Weed management in non-crop areas presents very different problems compared to highly managed agricultural and horticultural crop situations. Invasive weeds can displace native vegetation (or preferred naturalized plants), reduce economic or recreational opportunities, alter fire regimes and generally cause problems with ecosystem services on a local, watershed, and regional basis.
Further complicating the problem of noxious and invasive weeds is the difficulty in implementing control strategies on vast areas of often difficult terrain. For example, yellow starthistle (Centaurea solstitialis) has invaded over 12 million acres in California alone!
- Author: Brad Hanson
During the last few years, one of my core research areas has included several projects related to preplant soil fumigation in collaboration with a number of UC, USDA-ARS, and industry researchers. I touched on soil fumigants a bit a few weeks ago shortly after methyl iodide was registered by DPR (link to previos post). Today I thought I’d touch upon research results related to minimizing emissions of two of the most widely used methyl bromide alternatives, 1,3-dichloropropene and chloropicrin.
Soil fumigation is used prior to planting a number of high value crops in California. One of the most widely used soil fumigants, methyl bromide,...
