RE: Quercus agrifolia and leaf drop.

Leaf drop in Q. agrifolia is not a symptom of Sudden Oak Death (SOD). I recommend the website www.suddenoakdeath.org. Also, contact your county agriculture commissioner (if you live in California). Or, try the UC Davis IPM website www.ipm.ucdavis.edu which has a ton of good info on several pest and disease problems!

Q. agrifolia tend to shed leaves in the summer. Also, it may be getting too much water. I don't have the original message of this thread, so I may be out of the loop with the specifics on this one.

Good luck!
Bridget


*******************************************
Bridget Lamp
Horticulturist/Museum Scientist
Mediterranean and Eastern North America
University of California Botanical Garden
200 Centennial Drive
Berkeley, Ca 94720
(510) 642-3812
*******************************************

At 09:55 PM 10/4/02 -0700, david feix wrote:
Carol,
Sudden Oak Death syndrome tends to have a much
different appearance on affected Quercus agrifolia
oaks.  The trees tend to retain the dead brown foliage
for some time after they are dead, and not to appear
suddenly stripped bare as after a bad attack of oak
leaf moths.

As far as I have heard, there has not been any further
bad news about Coast Redwoods being killed by the same
fungus, it may only serve as an alternate host, and
not be killed outright as for many oak species and
rhododendron species.
--- "Joynson, Carol" <carol.joynson@medtronic.com>
wrote:
>
> A quote from "City Trees", the March/April 2002
> edition:
> "Tree experts are anxiously running tests to
> determine whether redwoods, a key to the state's
> timber and tourism industries, are susceptible to a
> disease that has been laying waste to California
> oaks. The disease, called Sudden Oak Death (SOD),
> has killed tens of thousands of trees from Monterey
> County near San Francisco to southern Oregon, 500
> miles away. Campsites have been closed and trees
> chopped down to try to contain the infection. The
> disease-causing organism, Phytophthora ramorum, is
> related to the organism believed to have caused the
> Irish potato famine in the mid-19th century. No cure
> has been found. "
>
> It is a great sadness to travel up the coast and
> seesome of my favorite old beauties withering.  The
> disease is also threatening British oaks.


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