- Author: Cheryl A. Wilen
There has been more than the usual number of questions about what I am calling "bio-based" herbicides recently. Arguably, this is coming from news that some school districts and cities specifically calling out the use of glyphosate on the properties they manage. Landscaping departments want to know which of the products available work the best.
To start, please be aware that all of these products are contact herbicides that will not move through the plant. Therefore, they will not be effective if you are trying to get to any underground organ such as the roots, rhizomes, tubers, etc. of any perennial plant. Do not try to make a head to head comparison...
- Author: Ben Faber
- Re-posted by: Gale Perez
From the Topics in Subtropics blog ∴ June 15, 2016
Researchers have now confirmed that six glyphosate-resistant weed species have been identified in California. Four have been known to exist for some time; they are horseweed (marestail, Conyza spp.), hairy fleabane, rigid ryegrass and annual ryegrass. To that list, junglerice and Palmer amaranth in the Central Valley have been recently added to the list. Additional weeds that have become more of a challenge to control and are on the suspect list are goosegrass and, in the central San Joaquin Valley, the summer grasses sprangletop and witchgrass.
There have never been a lot of...
- Author: Seth Watkins
- Posted by: Gale Perez
Treevix (saflufenacil) is now labeled for use in California on pomegranates thanks in part to the Western Region IR-4 Project and the UC Davis Weed Science Program.
The IR-4 Project facilitates the registration of pest management products for specialty crops (fruits,vegetables,herbs,and other ornamentals.) Often, specialty crops have limited options for pest control, so the USDA funded IR-4 Program works with universities, industry, and growers to conduct the research to get the crop registered with the EPA.
The UC Davis IR-4 Field Research Center conducts approximately 30 field trials a year to evaluate chemical residue, crop safety, or efficacy. This year we have pest control residue trials in broccoli, plum, sesame,...
- Author: Gale Perez
Don't miss Clyde Elmore's photo exhibit “Our Great Outdoors”.
If you attend Weed Day 2016 (July 7, 2016) you'll get a chance to see the exhibit.
“Our Great Outdoors”
July 8-Sept. 2, 2016
Buehler Alumni Center, UC Davis
There will be a reception from 4-7 PM on July 8, 2016.
Clyde Elmore
clelmore37@gmail.com
- Author: Richard Smith
- Posted by: Gale Perez
On January 12, 2016 the Federal EPA label for Kerb SC was reinstated for leaf lettuce. The registration on leaf lettuce was pulled in 2009 and Dow AgroSciences worked in the intervening years reregister Kerb. The new label allows for the use of Kerb from 25 to 55 day prior to harvest (Table 1). The 25 day preharvest interval is significant because it allows the use of Kerb on baby lettuce which is typically harvested in 25-30 days after the first wet date during the summer months (Figure 1). The 25 day preharvest interval gives growers an option for controlling weeds in high density plantings; this change is very helpful because high density plantings cannot be cultivated and weeds that occur must be removed by hand prior to mechanical...