Sudden
Oak Death found in NJ |
greentreedoctor |
Jun
04, 2004 15:03 PDT |
TREE-KILLING
CALIFORNIA FUNGUS NOW A CONCERN IN NJ From:
http://www.pressofatlanticcity.com/news/cape/
The state is trying to keep Sudden Oak Death from becoming a
household name in New Jersey like Chestnut Blight or Dutch Elm
Disease. One lilac bush at a Cape May County nursery recently
tested positive for the fungal disease during a 13-county
surveillance sweep conducted by the U.S. and state departments
of agriculture. The bush was tracked to a California wholesaler.
The other lilac bushes surrounding this plant at the Cape May
County nursery did not have the disease but were destroyed as a
precaution. The state did not
identify the nursery to avoid stigmatizing the business, state
agriculture spokeswoman Lynne Richmond said. It was the first
time Phytophthora ramorum, commonly called Sudden Oak Death, was
found in the Garden State.
"There are 13 counties in California with the disease. In
the most severely impacted, Monterey, Sonoma, you'd be
hard-pressed to find someone who does not know what it is,"
Katie Palmieri said. Palmieri is a spokeswoman for the
California Oak Mortality Task Force. Sudden Oak Death has cost
California millions of dollars in lost business and surveillance
to stop its spread. More than 1,500nurseries were affected with
quarantines, testing or other regulation. Some lost more than $1
million in business, Palmieri said. In at least one case, an
outbreak of the fungus forced a wooded campground to close
temporarily, she said. "The trees were so unstable. It
proved to be a huge property liability," she said.
The dead
trees also pose a fire hazard. California has removed many dead
or dying trees in wooded areas near homes, Alameda County
biologist Ken Peek said. "More people are building near
woods, so the fire hazard has been an immediate concern,"
he said. Scientists identified the fungus in the mid-1990s.
Scientists are not sure how the fungus could affect eastern oak
trees, Peek said. "The other concern is back East you have
a lot of oak forest with many more varieties of oak. There is a
big concern about whether this thing could cause quite a
problem," he said. "We're not sure what the risk is
between a nursery setting and the woods, but people want to err
on the safe side."
New Jersey
was not the first eastern state to see the disease recently. So
far this year, Pennsylvania and Maryland have identified the
fungus, said Carl Schulze Jr., director of the New Jersey
Division of Plant Industry. "The disease leapfrogged across
the country through the shipment of infected nursery
stock," he said. "We're taking a cautious step hereto
do surveys of our nurseries and woodlands to see if the disease
is here, has been a minor disease here or whether this is a new
problem forests may face." Several shrubs and flowers serve
as host to the fungus, which causes leaf spots or twig die off.
But oak trees are especially susceptible. The disease has killed
thousands of California's black oaks, tanoaks and coast live
oaks. "It will girdle the tree, physically cut off the
transportation of food and water. You'll see this browning of
the leaves and a fairly rapid decline," Peek said.
Despite the
disease's name, the fungus usually takes more than a year to
kill a healthy tree. But the final browning and die off of
leavescan take just a few weeks, which accounts for its name.
California and New Jersey have done a good job informing Cape
May County's nurseries about the disease, said Stan Sperlak,
owner of Cape Shore Gardens in Middle Township. "We're in
good hands when those companies are doing research and
education," he said. "We get faxes and letters daily
about whether plants that have been quarantined are cleared. We
here in southern New Jersey are fairly safe." The state
said local homeowners should feel confident about buying plants
from any of the Cape May County nurseries. Just one plant
of2,100 samples taken in 13 counties tested positive.
"There should be no concern about people buying local stock
from their nurseries," Schulze said.
|
Re:
Non-native invasive update: SOD now reported in 17 states |
greentreedoctor |
Jun
07, 2004 17:36 PDT |
Nurseries
Trace-forward surveys from nursery shipments are still underway,
and the national survey continues. Of the trace-forward,
national, and other surveys conducted to date, 125 nurseries in
17 states have had P. ramorum detections. Positive findings by
state are: CA(45), AL(3), AR(1), FL(6), WA(18), OR(9), TX(6),
CO(1), GA(13), LA(6), MD(2), NC(9), NM(1), TN(2), PA(1), NJ(1),
and VA(1). In all, 787,842 plants have been destroyed (June SOD
newletter).
http://suddenoakdeath.tamu.edu/maps.asp
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Re:
Non-native invasive update: SOD now reported in 17 states |
greentreedoctor |
Jun
08, 2004 15:06 PDT |
...do
they yet have any ideas where SOD came from?
Sudden oak death - a non-native plant disease whose origin is
still unknown - is caused by Phytophthora ramorum, a fungus that
invades susceptible trees through the bark, killing all or parts
of the tree, sometimes rapidly.
http://www.oda.state.or.us/information/news/2002/020903sod.html
The pathogen is not a fungus or a bacterium, but a member of a
unique group of organisms called Oomycetes. Oomycetes share some
characteristics of fungi but are biologically different..
The American strain of sudden oak death was found for the first
time in 1995 in Mill Valley, California.
Since May 2003, the European strain of sudden oak death has been
detected in nurseries in California, Oregon, Washington and
British Columbia, Canada. However, there is no evidence that the
European strain has moved beyond the nursery environment.
The origin of sudden oak death is unknown
Plant pathologists do not know where the pathogen originated,
but the disease is spread naturally and artificially.
a.. In nature, the pathogen is spread through the movement of
water in the form of rain, mist, dew and runoff.
b.. Humans spread the disease through the movement of infected
nursery stock, firewood and soil on the bottoms of shoes and
boots
http://agr.wa.gov/PlantsInsects/Diseases/SOD/default.htm
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