- 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...
- Author: Marie Jasieniuk
Horseweed and hairy fleabane are closely related annual weeds that are widespread in Central Valley orchards and vineyards where many populations have evolved resistance to glyphosate. Interestingly, however, the geographic distribution of glyphosate resistance differs markedly between the two weeds.
A survey of 42 horseweed populations across the Central Valley in 2010 showed that glyphosate-resistant plants were abundant across the southern part of the Valley but that horseweed in the northern part of the Valley was still largely susceptible. In contrast, a survey (unpublished) of 35 hairy fleabane populations in the same general...
- Author: Brad Hanson
A followup today on a post from last October about a series of glyphosate-resistant weed extension publications that were "about to be finalized". These four paper finally wound their way through the review and publication process and were posted on the UC ANR Catalog last week.
Brad
Selection pressure, shifting populations, and herbicide resistance and tolerance. Hanson, B., A. Fisher, A. Shrestha, M. Jasieniuk, E. Peachey, R. Boydston, T. Miller, K. Al-Khatib. 2013. University of California, Division of...
- Author: Brad Hanson
Kassim Al-Khatib, Director of the UC-Statewide Integrated Pest Management (UC-IPM) Program, sent a couple links about the identification of Palmer amaranth and comparison to other amaranth (pigweed) species. I thought they were useful and potentially of interest to California weed managers so I thought I'd share:
In this first link, Dr Bill Johnson and Travis Legleiter, weed scientists from Purdue University have a video explanation for helping growers identify Palmer amaranth and explain differences between other related species in Indiana (click here for...
- Author: Gale Perez
Join UC Farm Advisor Janet Caprile for an overview of weed management techniques for perennial and annual cropping systems that don't rely on synthetic herbicides or chemicals.
Wednesday, July 31, 2013
Livermore, California
For more information, click HERE.
