|Weed Day attendees head to research field at UC Davis.|
A crowd of near 100 attended
the UC Davis Weed Day on Thursday, July 11.
The popular event is hosted by the UC Davis Weed Science Program and UC Weed
Research and Information Center.
Topics discussed included melons and weed response to
herbicides, by Lynn Sosnoskie and Brad Hanson, UC Davis. They reported that
herbicides are available for postemergence use in melon production, but only on
grass species, not broadleaves. Melon
growers are in need of new pre and post options as well as a new weed
management program to effectively control troublesome weeds.
Sosnoskie and Hanson also
focused on field bindweed management in processing tomatoes. Field Bindweed is
a deep-rooted, hardy perennial that propagates and spreads via asexual
(rhizomes) and sexual (seed) means. Once established, the species is extremely
difficult to manage.
The goal of the research was
to evaluate the efficacy of pre/post herbicides for field bindweed control in
early and late planted tomatoes.
In the early planted tomatoes
all herbicide treatment combinations reduced both perennial and seedling
bindweed density and cover.
On the late planted tomatoes,
the use of glyphosate, preplant, reduced in-crop field bindweed cover at two
weeks after transplanting across treatments.
|Brad Hanson |
Hanson also spoke about the
management and mitigation of herbicide resistant weeds. He noted that most
recommendations focus on multiple herbicide modes of action. “In tree and vine
crops, including preemergence herbicides can increase the available herbicide
modes of action and can reduce dependence of the available postemergence
herbicides,” Hanson said. “Several relatively new preemergence herbicides are
available for use in tree nut orchards and growers.”
For instance, Hairy Fleabane can
be controlled very well during the bolting stage with Rely herbicide at 3 pints
per acre with AMS at 2 quarts per 100 gallons.
More information on this
meeting will be published in Vegetables
Labels: 57th annual Weed Day, Brand Hanson, California Ag Today, Field Bindweed, Harry Fleabane, Lynn Sosnoskie, UC Davis, Vegetables West Magazine