- Author: Clyde Elmore
- Posted by: Gale Perez
Do weed populations change during a drought? Does drought favor certain species? Does annual or perennial species matter? During this four year period of drought in California, have they changed? What are the populations of annual and perennial weeds? With a limiting growth factor, in this case water, weeds become more prominent and which of them will or could disappear?
In urban landscapes, where turf grass areas are being renovated, or in non-irrigated land that has been farmed, but furloughed, or in non-cropped roadsides or wasteland, are we seeing life-cycle species shifts? Or is it that we see a loss or decreased competitiveness of annual species, thus perennial species can be observed?
I will give the example of...
- Author: John A Roncoroni
- Posted by: Brad Hanson
Reposted with permission from the January 2014 issue of "CWSS Research Update and News", a semiannual publication by the California Weed Science Society. Check out that issue for several other interesting research and extension articles. Take care, Brad
Control of Willowherb in California's North Coast Vineyards
- John Roncoroni, UCCE Napa...
- Posted by: Gale Perez
Here's an article by Paul Franson | Wines & Vines | 07.22.2014
Napa, Calif.—Last week John Roncoroni, a Napa County UC Cooperative Extension weed science advisor, held a field demonstration about the efficacy of herbicides newly registered for vineyard application. He had laid out 25 treatment plots and rated the herbicides for weed control in vineyards.
- Author: Carl E. Bell
- Re-posted by: Gale Perez
From the Invasive Plants in Southern California blog :: Jan. 24, 2014
Tips on applying herbicides
The table below is from training that my colleagues Dr. Cheryl Wilen, Area Advisor, UC IPM; Dr. Milt McGiffen, Extension Specialist, UC Riverside; and I did in southern California at four locations in 2009/2010 with a total of 80 people that all had previous experience applying herbicides on invasive plants. This training utilized the 128th acre sprayer calibration method (more on that below).
- Author: Carl E. Bell
- Posted by: Gale Perez
Plant growth and development and herbicide efficacy, part 1
In the 1920's and 30's field bindweed (Convovulus arvensis) was a major weed in the western US; so much so that coordinated research was undertaken by the most prestigious Agricultural Universities from California to Oklahoma to figure out what to do. And this was before the advent of herbicides, so scientists and farmers had to rely on other methods, especially cultivation. After much work, it was discovered that the pernicious bindweed could be eradicated from a field by regular cultivation for just two seasons. They used duck-foot cultivators; a collection of several flat triangular blades that overlapped and ran horizontally about 2-4 inches below the...
