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...
- Author: Gale Perez
Check out the Sept. issue of the California Weed Science Society journal (CWSS Research Update and News).
- Developing an Accuracy Risk Assessment Tool for Evaluating the Potential Invasiveness of Ornamental Plants
- Managing Junglerice in Corn
- Managing Junglerice in Tree Nut Crops--A Summer Weed Resistant to Glyphosate
- Weed Management in Tulelake Processing Onions
- Passive Restoration of California Grassland and Coastal Sage Scrub
- Riding instead of Walking: The UTV sprayer system for large-scale invasive plant control
- Posted by: Gale Perez
The UC Davis Weed Day is popular among a cross-section of agricultural interests. It typically draws university representatives including weed science experts, farm advisors, graduate students, visiting professors, technical experts from the various chemical companies and even state and federal regulators.
The 58th annual event was no different, which pleased event...
- Author: Joe DiTomaso
- Author: Tom Barr
Aquatic weed propagules pose a serious long-term management problem. Curlyleaf pondweed (Potamogeton crispus) produces numerous asexual propagules that make traditional management difficult. We initially compared the effect of three benthic barrier materials (jute, polyethylene and rubber) on the control of curlyleaf pondweed turions (see Fig. 1 for example of bottom barriers) in both laboratory bench studies and studies using larger mesocosms. After the bottom barriers covered the turions for eight weeks we then determined the viability of the turions by allowing them to sprout. Our results showed that the jute and polyethylene did not give any control of curlyleaf pondweed sprouting, but the rubber barrier, which blocks both...
- Author: Rob Wilson
Happy New Year! It’s too cold in Tulelake for field work, so I’m busy summarizing 2013 research results. Today I posted a progress report on the Intermountain Research and Extension Center (IREC) website summarizing results for our 2013 onion weed control research. The study was conducted at IREC to evaluate rates of DCPA (Dacthal) alone and combined with pendamethalin (Prowl H20) applied at loop stage for control of kochia in onions grown on silty clay soil with high organic matter. Sulfentrazone (Zeus), an unregistered herbicide in onions, was tested at various rates as a preemergence and postemergence herbicide on the same soil type. Prowl H20 application timing was also evaluated by comparing applications...