Dear Colleagues:
Please find enclosed some new dates and new information regarding our
upcoming meeting, including cost of registration and accommodation
suggestions as well as abstract formats. You are kindly invited to
circulate this message among colleagues you think might be interested
in the meeting. Please also visit the web site for more information.
Don't hesitate to contact the organizers for more information.
Apologies for those who received this message twice.
Hope to see you in Florence!
Salvatore Moricca
Richard Hamelin
http://www.iufro.org/science/divisions/division-7/70000/70200/70205/
Hi Mike, and others who have responded,
Kevin Smith's review "An organismal view of dendrochronology" in
Dendrochronologia mentions examples of white rings that develop in poplar
and birch in response to insect defoliation or crown loss in winter
storms.
I am not sure what would cause dark rings in oak, but agree that it is
something that is activating a compartmentalization response and/or
creating a barrier zone. Because these occurrences are a complete, single
growth ring that encompasses the whole tree, I suspect an environmental
factor.
Mike, you might check for a correlation between the year of the ring and
winter injury, late or early frost, an extreme winter or summer
temperature event, or maybe even flooding or insect defoliation.
In response to Ed Barnard, I don't think these rings indicate oak wilt, as
infections in white oaks that survive the first year generally show up as
incomplete and spotty dark rings, with additional partial dark rings in
the same affected areas the following year in surviving white oaks. Among
oaks, red oaks die very quickly of oak wilt, so you wouldn't see this long
term survival.
On a different dendrochronology note:
If anyone is familiar with "islands" of enclosed phloem in red or live
oaks that apparently generate a new layer of xylem-generating cambium
after cambium injury please let me know. I have found this response in
several oak species after attack by the cambium-feeding gold-spotted oak
borer (GSOB), Agrilus coxalis, which is now a problem pest in Southern
California.
I am developing methods of back-dating such enclosed phloem to reconstruct
the history of the pest's residence and spread within and among stands,
and determine onset of tree mortality after attacks. So I need to know
other factors -- biotic or environmental -- that may generate similar new
layers of xylem external to patches of enclosed phloem. I have enclosed
pictures of the enclosed phloem and response wood that develops after GSOB
attack if inner phloem has not been killed by very heavy attacks and/or
pathogens associated with this decline.
Thanks!
Paul Zambino
><><><><><><><><><><><><><><><><><><><><><
Paul Zambino, Ph.D.
Plant Pathologist, Forest Health Protection
Southern California Shared Service Area
San Bernardino NF - SO
602 S. Tippecanoe
San Bernardino, CA 92408-3430
Ph: (909)382-2727 FAX: (909)383-5586
Cell: (909)215-0394
Email: pzambino(a)fs.fed.us
><><><><><><><><><><><><><><><><><><><><><
"Barnard, Ed" <barnare(a)doacs.state.fl.us>
Sent by: rg70300-forent-bounces(a)lists.iufro.org
11/21/2009 11:09 AM
Please respond to
"IUFRO RG 7.03.00" <rg70300-forent(a)lists.iufro.org>
To
"IUFRO RG 7.03.00" <rg70300-forent(a)lists.iufro.org>
cc
Subject
Re: [IUFRO RG 7.03 FORENT] Fwd: Dark rings in red oak logs
Folks (and particularly Mike Albers),
Very interesting! I really have no idea, being for the most
part a Pathologist in Florida dealing primarily with pines. As a
pathologist, a thought comes to mind, but you should try to verify even
the possibility of this with someone who deals with oak wilt (caused by
Ceratocystis fagacearum). You are (as I understand it) in an area where
this disease occurs, and red oaks are susceptible hosts, often displaying
vascular staining or streaking. Most of the time infected red oaks die,
but I do know that if infections of some vascular wilts are not lethal,
recovery can occur, sometimes ?compartmentalizing? the pathogen in
interior vascular tissues ? together with its associated vascular
staining. Any chance that these trees might be oak wilt survivors? This
could possibly be evaluated in a laboratory.
Ed
From: rg70300-forent-bounces(a)lists.iufro.org
[mailto:rg70300-forent-bounces@lists.iufro.org] On Behalf Of Mike Albers
Sent: Thursday, November 19, 2009 11:44 AM
To: rg70300-forent(a)lists.iufro.org
Subject: [IUFRO RG 7.03 FORENT] Fwd: Dark rings in red oak logs
Any idea what would cause dark rings in red oak logs as in the attached
pictures?
The dark rings run the length of the logs. So far this has been seen on a
number of sites in 3 or 4 counties in Minnesota. Not all red oak trees on
a site have the dark rings.
My first guess is that it is a barrier zone resulting from a wound or
injury of some type. However it seems strange that it forms a complete
cylinder that reaches the ends of the logs. I didn't see any logs where
the dark ring only went part way around a log. Also there were some logs
that had obvious injuries with decay and discoloration but these logs did
not form rings or even have distinct barrier zones going even part way
around the log.
I've only looked at logs like this while in the mill, not on the site
where they were harvested. At first, the thought was that these rings were
the result of something happening 16 to 17 years ago. This will take more
investigation, but it looks to me like the time period varies anywhere
from 6 to 35 years. Also at this time I can't say if the time period
varies ibetween sites, or if the time period varies from log to log on the
same site.
Any suggestions would be appreciated.
Mike Albers
Forest Health Specialist
MN DNR-Forestry
1201 E. Hwy. # 2
Grand Rapids, MN 55744
(218)-327-4115_______________________________________________
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Any idea what would cause dark rings in red oak logs as in the attached pictures?
The dark rings run the length of the logs. So far this has been seen on a number of sites in 3 or 4 counties in Minnesota. Not all red oak trees on a site have the dark rings.
My first guess is that it is a barrier zone resulting from a wound or injury of some type. However it seems strange that it forms a complete cylinder that reaches the ends of the logs. I didn't see any logs where the dark ring only went part way around a log. Also there were some logs that had obvious injuries with decay and discoloration but these logs did not form rings or even have distinct barrier zones going even part way around the log.
I've only looked at logs like this while in the mill, not on the site where they were harvested. At first, the thought was that these rings were the result of something happening 16 to 17 years ago. This will take more investigation, but it looks to me like the time period varies anywhere from 6 to 35 years. Also at this time I can't say if the time period varies ibetween sites, or if the time period varies from log to log on the same site.
Any suggestions would be appreciated.
Mike Albers
Forest Health Specialist
MN DNR-Forestry
1201 E. Hwy. # 2
Grand Rapids, MN 55744
(218)-327-4115
Mike Albers
Forest Health Specialist
MN DNR-Forestry
1201 E. Hwy. # 2
Grand Rapids, MN 55744
(218)-327-4115
Mike Albers
Forest Health Specialist
MN DNR-Forestry
1201 E. Hwy. # 2
Grand Rapids, MN 55744
(218)-327-4115
Mike Albers
Forest Health Specialist
MN DNR-Forestry
1201 E. Hwy. # 2
Grand Rapids, MN 55744
(218)-327-4115
Mike Albers
Forest Health Specialist
MN DNR-Forestry
1201 E. Hwy. # 2
Grand Rapids, MN 55744
(218)-327-4115
A graduate research assistantship is available to support a student pursuing
an MS or PhD degree with my program through the Department of Forest and
Wildlife Ecology at the University of Wisconsin-Madison. A generous
stipend, medical benefits, and tuition waiver are included. Only candidates
with a strong background in plant and forest sciences, as well as plant
pathology and mycology, are encouraged to apply. Excellent abilities in
spoken and written English are required. Support can begin in fall semester
2010.
Please see the web page of the Department of Forest and Wildlife Ecology
(http://forestandwildlifeecology.wisc.edu/) and the link there for
application instructions. Information regarding recent activities in my
program can easily be obtained by searching the web for publications.
Glen R. Stanosz, Ph. D.
Professor of Forest Pathology
Department of Plant Pathology
Department of Forest and Wildlife Ecology
University of Wisconsin-Madison
1630 Linden Drive
Madison, WI 53706 USA
telephone: 608-265-2863
fax: 608-263-2626
email: grs(a)plantpath.wisc.edu
FOREST PATHOLOGY: research, teaching, and outreach to keep trees and forests
green and growing!
Colleagues - Please circulate to all interested persons:
The Missouri Department of Conservation is seeking candidates for the Forest Pathologist (Resource Scientist) position located in Columbia, Missouri, USA. The Pathologist partners with the Forest Entomologist to monitor forest health and provide forest health information to resource managers, landowners and the general public in Missouri. The Pathologist provides leadership in Department responses to emerging forest disease issues and conducts forest pathology research relating to forest health monitoring and resource management. The job description and information for applying online are available at this site:
http://mdc.mo.gov/about/jobs/<http://webmail/owa/redir.aspx?C=8fde18d6b1514768b1dbe8ad86318409&URL=http%3…>
Deadline for applications is January 15, 2010.
--------------------------------------------------------------
Robert Lawrence, Ph.D.
Resource Scientist - Forest Entomologist
Missouri Department of Conservation
1110 South College Ave.
Columbia, MO 65201
Tel: 573-882-9909, ext. 3303
Fax: 573-882-4517
E-mail: Robert.Lawrence(a)mdc.mo.gov<http://webmail/owa/redir.aspx?C=8fde18d6b1514768b1dbe8ad86318409&URL=mailto…>
---------------------------------------------------------------
Dear Forest Pathologists:
Mark your calendars! The Fourth International Rusts of Forest Trees
Conference will be held in beautiful Florence, Italy, May 3-7 2010.
Stay tuned for further details or visit the web site at
http://www.iufro.org/science/divisions/division-7/70000/70200/70205/activit…
Hope to see you in Florence!
Salvatore Moricca
Richard Hamelin
Nancy,
The problem is that it takes several years to produce a broom of a size
that results in culling, and hence the current culls are almost
certainly a legacy from before the time of chick weed control. The
broom in your picture is at least five years old.
So, even if chickweed control is effective, it will take several more
years before the damage disappears.
Infection by basidiospores occurs in the spring from telia on dead
foliage of the previous year, and the first symptom is a slight swelling
of the infected twig a year or more later. Two years after infection
the first systemically infected shoots appear. Assuming that chickweed
control became effective in 2007, then 2007 was the last possible year
of infection (from telia on 2006 chickweed foliage). The first
systemically infected shoots on these infections would have been
produced in 2009. They would be nearly impossible to find this late in
the year, but they should be visible early summer 2010 when the aecia on
their new shoots are in their full glory.
But there is a further consideration. Rusts of this sort typically have
wave years of infection. I would expect that the large majority of
brooms in a single plantation belong to a single or at most a few age
cohorts. This means that you may have to wait several years before you
can begin to be confident that the chickweed control has worked (or that
other hosts are involved).
Bart van der Kamp
UBC
Dear Forest Phytophthorologists,
This is a reminder that earlybird registration and abstract submission for
the 5th IUFRO Phytophthora diseases in forests and natural ecosystems
meeting close 31 October 2009. The meeting will begin in Auckland, New
Zealand on 7 March 2010 and we will travel together to Rotorua for the
remainder of the meeting, which will finish on 12 March 2010.
Further information is available at the conference homepage:
http://www.phyto2010.com/index.html
Regards, Tod Ramsfield
Tod Ramsfield, Ph.D.
Molecular Forest Pathologist
Forest Biosecurity and Protection
Scion*
Private Bag 3020
Rotorua
3046
New Zealand
Phone: 64-7-343-5534
Mobile: 64-27-366-1422
Fax: 64-7-348-0952
e-mail: tod.ramsfield(a)scionresearch.com
*Scion is the trading name of the New Zealand Forest Research Institute,
Ltd.
Hello Forpathers,
I am forwarding this message at the request of our diagnostician,
Nancy Taylor (taylor.8(a)osu.edu) If anyone has any insights, please
share directly with Nancy.
I apologize in advance if you see this multiple times.
Thanks!
Enrico
>
>
>Hi Diagnosticians,
>
>A few Christmas tree growers in Upstate NY are having problems with
>Fir Broom Rust (Melampsorella) on their fraser firs. This disease,
>with the disfiguration it causes on random branches, has lead to
>loss of hundred of trees that became unmarketable. The main
>alternate hosts for this disease, chickweeds, have been controlled
>in the affected plantings about two years ago. The disease still is
>presenting a problem for some growers. One reference indicates that
>ferns may also be alternate hosts. The growers have some
>naturalized ferns (hay scented and sensitive ferns) with no apparent
>symptoms in nearby hedge rows. Not much has been written about
>this disease. Does anybody have insights they could share.
>Fungicides? Timing?
>
>Thanks,
>
>Brian
>
>Brian Eshenaur
>Cornell University Extension
>New York State Integrated Pest Management Program
>Internet: http://www.nysipm.cornell.edu
>
>249 Highland Avenue
>Rochester NY 14620
>p 585.461.1000 ext 240
>f 585.442.7577
>
>
>
>Content-Type: text/plain; name="CANIT-VOTING-LINKS-948903426-2332d04102cd.txt"
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>--
>BEGIN-ANTISPAM-VOTING-LINKS
>------------------------------------------------------
>
>Teach CanIt if this mail (ID 948903426) is spam:
>Spam: https://antispam.osu.edu/b.php?i=948903426&m=2332d04102cd&c=s
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>Forget vote: https://antispam.osu.edu/b.php?i=948903426&m=2332d04102cd&c=f
>------------------------------------------------------
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--
Pierluigi (Enrico) Bonello, Assoc. Professor
Dept. of Plant Pathology
The Ohio State University
201 Kottman Hall
2021 Coffey Road
Columbus, OH 43210
Tel: (614) 688-5401
Lab: (614) 688-5409
Fax: (614) 292-4455
http://plantpath.osu.edu/people-and-programs/faculty-directory/bonello-pier…
Environmental Science Graduate Program (ESGP)
http://esgp.osu.edu/
Plant Molecular Biology and Biotechnology Program (PMBB)
http://pmbb.osu.edu/
To all Forest Pathers:
I am currently looking for Tree of heaven(Ailanthus altissima) seed from the
following
regions/states of the U.S. & Canada:
Northeast-
VT, NH, CT,RI,
Quebec, New Brunswick, Nova Scotia
Southeast-
GA, AL, LA, MS, FL,
TN,
KY,AR
Midwest-
MN,SD,ND,MI,WI,NE,KS,MO,IA,IN,Manitoba, Saskatchewan
West-
WA,OR,WY,MT,NV,UT,CO, Alberta, BC
Southwest-NM,TX,OK, Mexico
We
have already collected seed from all non-listed states. We are also aware that
Ailanthus may not exist in some of the states listed. There is evidence that
Ailanthus was introduced multiple times into this country on both coasts
possibly suggesting that sub-populations of this species may exist if seed came
from geographically different areas in China. We are
currently working with a Verticillium fungus as a potential control of
Ailanthus and want to test to see if all subspecies of Ailanthus are equally
susceptible to our fungus, assuming that subspecies
even exist. Please Email me if you have seed or could get seed (100-250 seeds
if possible) from those regions listed above. Samples can be sent to the
address below. Please dry before sending. Helpful information includes GPS
coordinates or closest town name, number of trees seed was collected from (1 or
>1), general setting (roadside, forest, etc.). Again, thank you for your
help.
Regards,
Matt Kasson
Matthew T. Kasson
PhD Candidate
401
Buckhout Lab
Department of Plant Pathology
The Pennsylvania State University
University Park, PA
16802
phone: 814.308.2887
email:
mtk178(a)psu.edu
