FYI :

Have seen DITGRA in Santa Cruz county along hwy. 152 (near fair grounds), in "animal ag" areas in the Casserly rd. region,

 in the San Lorenzo river south of hwy. 1 (pretty thick), along Hwy 1 near La Fonda  and lots of it along Hwy 152 near Casa de Fruita. 

 I have been working (with the interns) to keep this weed off of the UCSC campus  and out of the quarries where I conduct additional

weed abatement, with pretty good success. Mostly hand pulling before flowering.

Bill

On Tue, Sep 11, 2018 at 3:08 PM, Wrubel, Eric <eric_wrubel@nps.gov> wrote:

Brownsey, Kaiser and DiTomaso (2013)  provide a good overview of invasion risk, impacts and management of stinkwort in California. Here's the link: https://wric.ucdavis.edu/PDFs/CalAg6702p110-2013.pdf

In it's native Mediterranean range, stinkwort inhabits regularly disturbed riparian, marsh, and ruderal habitats such as floodplains, sandbars, marsh transition zones, vernal pools, and alluvial plains. I expect that these types of high-disturbance, low competition habitats are the most at risk from stinkwort invasion in California. Initial results reported in this paper indicate that stinkwort has relatively slow-growing, shallow root systems, which may limit it's competitiveness in rangelands. This is consistent with my observations of dense infestations along road shoulders that have not significantly spread into adjacent annual grasslands. However, in riparian or marsh systems with more water availability, stinkwort may not be as limited by belowground competition for moisture, and could invade open wetlands and riparian zones. This sounds like what you've observed at Annadel. I'm not surprised stinkwort spread into burned areas, because it is well adapted to disperse into disturbed areas. I expect it will eventually get shaded out where there is forest regrowth, but will probably persist in pockets. Important to time treatments before seed set.

Thanks, 

Eric

Eric Wrubel

Botanist

National Park Service

San Francisco Bay Area Network

Inventory and Monitoring Program

415-289-1849

On Tue, Sep 11, 2018 at 2:55 PM, Simpson, Bobbi <bobbi_simpson@nps.gov> wrote:

This might be of interest to you... 

https://shastacnps.org/images/recordsearchlight/Stinkwort_Jennifer_Gibson_12-3-16_as_published_LB.pdf

 ~

Bobbi Simpson
~~~~~
Liaison, California Exotic Plant Management Team

National Park Service

1 Bear Valley Road

Point Reyes Station, California 94956
415-717-0471 cell, 415-464-5190 office

For NPS invasive plant practitioners, check out our CAEPMT sharepoint site 

 

One ....

 

 

California Invasive Plant Council, www.cal-ipc.org
To unsubscribe from this list please go to http://www.simplelists.com/confirm.php?u=9T8KAOkZS077wFDS6AX3724k7d9oPx1z

California Invasive Plant Council, www.cal-ipc.org
To unsubscribe from this list please go to http://www.simplelists.com/confirm.php?u=rS403RsUMnRI1H4SrQC8I1BjORoeVSrG

--

Bill Reid
Coordinator
Campus Site Stewardship Program
UCSC Grounds Services
1156 High st. Barn G
Santa Cruz (5064
(831)459-4680

California Invasive Plant Council, www.cal-ipc.org
To unsubscribe from this list please go to http://www.simplelists.com/confirm.php?u=hX2mS7OPJICHdlCMroQDpeSI7EHh0k4U