The global horticultural trade in ornamental plants is well known to be a primary source of non-native invasive plant introductions worldwide. In the United States, non-native species make up as much as 80% of the ornamental nursery stock and account for most nursery revenue. Although only a small percentage of these species escape cultivation and become invasive, the large number and diversity cultivated, especially in California, results in ornamental plants contributing to more than half of the invasive weeds currently damaging California's wildlands and remnant natural areas in urban landscapes.
The majority of ornamental plants are purchased and grown by the public. Thus, educating consumers to make informed choices towards...
When wildfires burn in California, people often call them forest fires or brushfires, but the odds are high that an invasive weed is an unrecognized fuels component, says a UC Agriculture and Natural Resources scientist.
“We have all of the nasty non-native Bromus species here in California, and these weeds are key drivers of increasing fire frequency,” said Travis Bean, UC Cooperative Extension weed science specialist based at UC Riverside.
The invasive, non-native Bromus species aggressively outcompete native plants, forming dense stands that grow fast and dry out quickly, becoming highly flammable. Fire can move...
- Author: Thomas Jabusch
- Posted by: Guy B Kyser
Arundo donax is devastating to riparian habitat and becoming increasingly widespread in the Sacramento – San Joaquin Delta. To counter this growing problem, the Sacramento-San Joaquin Delta Conservancy (Delta Conservancy) envisions a delta-wide, long-term Arundo Control and Restoration Program to treat Arundo infestations and restore native vegetation to improve habitat along Delta waterways.
Since 2014, the Delta Conservancy has led a pilot project controlling Arundo and restoring riparian forest habitat in the Cache Slough Complex, funded by the California Department of Water Resources (DWR), and partnered with the Solano Resource Conservation District (SRCD) and Sonoma Ecology Center (SEC). As part of the Delta...
- Author: Brad Hanson
James Schaeffer and his UCCE and CSU Fresno colleagues are conducting a survey to gather information on a relatively new weed problem in orchard crops of the San Joaquin Valley. The species, alkaliweed (Cressa truxillensis) is a native perennial that can be a really difficult weed to control because 1) it is a perennial so not very senstive to PRE herbidies, 2) it is not very sensitive to glyphosate, and 3) it is very tolerant of saline soils where many other plant species do not grow well.
James' request and link to the survey is below
- Author: Sarah Light
In March of this year I traveled to Chimoio, Mozambique to provide an Integrated Pest Management training to a group of farmers through the USAID Farmer-to-Farmer program. On my first day at the farm, we toured the farm and discussed their worst pest issues. One of the farmers brought a red flowering weed to show me, which he said it caused major issues in corn and was very difficult to control.
We continued on our way and it became clear that the biggest pest issue they were facing was the fall armyworm, an invasive species that spread to Mozambique in 2017 and can decimate a corn field. Since chemical inputs aren't always economically feasible for low-input systems like the one I was working in, I was interested learning about...