Newspaper Page Text
Sudden Oak Death has infected plants in five Georgia nurseries
By Shay Smith
For the Forsyth County News
By now most of you may
have already heard that
Phytophthora ramorum, cause
of Sudden Oak Death, has
been positively identified on
plants within five Georgia
nurseries: John Deere No.
173, College Park; Greenbrier
Nurseries, Evans; Green
Thumb-West, Augusta; Co
fer’s Home and Garden,
Athens; and Craven Pottery,
Commerce.
The infected plants are all
camellias, that originated from
Monrovia Nurseries in Azusa
(Los Angeles County), Calif.
Only these imported plants
have tested positive for SOD.
No plants grown or origi
nating in Georgia have tested
positive for SOD. Hundreds of
samples have already been
processed through the
Extension Plant Pathology
laboratory in Athens, and
more are in the process of
being evaluated.
SOD has killed oaks in
California and Oregon, and
has the potential to kill eastern
oak species as well. Oak tree
infection is a virtual "dead
end’’ for the fungal pathogen.
It infects through the bark of
oak trees and causes girdling
cankers to develop that kill the
tree. The cankers are referred
to as "bleeding cankers”
because the sites of infection
ooze sap and are often darkly
discolored.
SOD has not been identi
fied on oaks in Georgia. Years
of drought, followed by very
wet conditions in 2003. that
has led to root decay, is most
often the cause of oak decline
and mortality across the state.
Insect borers also may
have attacked the weakened
trees contributing to their
decline.
Borer infestations often
Amy Blackmarr to
speak at Hall library
Noted north Georgia author
Amy Blackmarr will be fea
tured at the Friends of the Hall
County Library System annual
meeting April 29 at 6:30 p.m.
at the Blackshear Place
Branch on Atlanta Highway in
Oakwood.
Ms. Blackmarr is the
author of three books: "Above
the Fall Line," "The Trail From
White Pine Cabin,” “House of
Steps,” “Finding the Path
Home," "Going to Ground.”
and “Simple Life on a Georgia
Pond.” This event is free and
open to the public. Refresh
ments will be served.
In her most recent book,
"Above the Fall Line: The Trail
from White Pine Cabin,”
Blackmarr returns to her native
Georgia from Kansas to live in
a tiny cabin in the north
Georgia mountains. This book
has given her a 2004 nomina
tion for Georgia Author of the
Year and the Philip D. Reed
B MOVIES 400 MfcC
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Smith
cause sap
oozing or
bleeding al
ong the trunk
that can stain
the trunk
black.
Oak infec
tion is a
"dead-end’’
for the dis
ease because
the fungus is not known to
produce spores on infected
oaks.
Therefore, the disease does
not spread from infected oaks.
Rather, the fungus infects
numerous shrub hosts that are
often found in association
with oak forests or in land
scapes. These include camel
lia, rhododendron, viburnum,
rose, honeysuckle, and many
more.
A complete list of hosts
can be found within the links
provided below. These hosts
are not killed by the disease,
but leaf spots and blighting
often occur that resembles leaf
scorch symptoms. The fungus
then produces abundant spores
on the infected leaves that are
mostly water-splashed to adja
cent plants.
Research in California also
has recovered P ramorum
from soil beneath infected
plants, as well as w ithin soil
contaminating hiker’s boots,
bike tires, and clothing. P.
ramorum is unlike other
Phytophthora species in that it
does not seem to infect the
roots of plants only the
aboveground parts of the
plant.
Provided below are links to
various Web sites containing
information on SOD Many
include pictures of infected
plants. Take a look at these to
familiarize yourself with SOD
symptoms, particularly on
camellia.
L- s.
Ksk' >
L i *■
Amy Blackmarr
Memorial Award for
Outstanding W'riting on the
Southern Environment.
Ms. Blackmarr will be
speaking about her writing,
answering questions and sign
ing copies of her books. All
three of her works will be avail
able for purchase at Chapter 11
bookstore before the annual
meeting. For more information
contact the Hall County Library
System at (770) 532-3311 or
visit the Web site at www.hall
countylibrary.org.
One of the other symptoms
associated with camellia
infection, aside from the tan to
brown, zoned, water-soaked
leaf spots that begin at the leaf
tip and progress down the leaf
toward the petiole, is exces
sive leaf drop
We are not recommending
the digging up and removal of
plants from the landscape.
Removal of the plants could
actually spread the disease
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faster and farther as infected
plants may wind up in munici
pal wastes and be shredded for
use as landscape mulch.
If you purchased Monrovia
Nursery plants, monitor them
and contact the Extension
office to have suspect samples
submitted to the Homeowner
Plant Disease Clinic in
Griffin.
Monrovia Nursery plants
are “branded” plants in that
FORSYTH COUNTY NEWS - Sunday, April IS, 2004 -
they are grown and sold in
specially labeled pots with
"Monrovia” written across the
side, as well as larger, colorful
plant labels.
We are only concerned
about plants that may have
been purchased and planted
within the last year, and possi
bly conservatively two years.
Plants that have been estab
lished within a landscape for
many years are unlikely to be
infected with SOD.
Links:
•Georgia Department of
Agriculture’s Q&A format
information:
http://www.apps.caes.uga.e
du/attachment/SOD.html
•Extension Disaster
Education Network look
for SOD link in upper left
hand comer:
http://www.agctr.lsu.cdu/e
den/default.aspx.
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