Dear colleagues,
On behalf of two Ph.D. students I would like to ask you for assistance
of their Ph.D. projects!
For molecular / population studies on Mycosphaerella dearnessii
(anamorph Lecanosticta acicola), the causal agent of brown spot needle
blight of pine species (Pinus spp.), we would be interested to obtain
isolates / populations of isolates of this fungus and/or pine needles
infected by M. dearnessii (preferably with conidiomata and/or ascomata
pesent). In the latter case the isolations would be done by the Ph.D.
candidates themselves.
The work will be done as part of the Ph.D. theses of Marion Kessler
(marion.kessler(a)bfw.gv.at ) at the Institute of Forest Entomology,
Forest Pathology and Forest Protection (IFFF), University of Natural
Resources and Applied Life Sciences, Vienna (BOKU), Austria (advisors:
Erhard Halmschlager, Thomas Cech & Christian Stauffer) and Josef
Janousek (janousek.jose(a)gmail.com) at the Faculty of Forestry and Wood
Technology, Mendel University in Brno, Czech Republic (advisors: Libor
Jankovsky & Christian Stauffer).
Isolates and samples from all parts of the world would be very welcome!
Of particular high interest are isolates from North, Central and South
America. This is because the fungus is suspected to be native there and
for comparisons of putative native versus introduced fungal populations
American isolates would be essential. Brown spot is a common and
important disease of Pinus palustris and other Pinus spp. in the
south-east and central USA, so we hope that US colleagues will be
willing to help in providing isolates/samples.
But isolates/samples from other parts of the world, especially also
from Asia, would be also very valuable. So far Marion and Josef have a
good collection of isolates from several parts of Europe, but additional
European material would also be good and can only strengthen the planned
work.
The EPPO diagnostic protocol for Mycosphaerella dearnessii contains a
lot of useful information on diagnosing the disease and it also includes
a number of excellent photographs of the symptoms:
http://www.eppo.org/QUARANTINE/fungi/Mycosphaerella_dearnessii/pm7-46%281%2…
In addition, Josef Janusek prepared a page with a few photos of
symptoms of brown spot needle blight:
http://picasaweb.google.cz/pepino96/BrownSpotNeedleBlightOfPines#
If you are able and willing to help, please contact me. Marion Kessler
and Josef Janusek will then provide you with further information
(details for sampling, sending, import permit, etc.). Please do not
hesitate to contact me in the case you have any further questions.
Thank you very much in advance for your help! Your assistance will be
invaluable and very much appreciated!
With best regards,
Thomas Kirisits
____________________________________________________________
Dr. Thomas Kirisits
Institut für Forstentomologie, Forstpathologie und Forstschutz
Department für Wald- und Bodenwissenschaften
Universität für Bodenkultur (BOKU)
Hasenauerstraße 38
A-1190 Wien
Österreich
Tel.: (++43) (1) 368-24-33
Fax: (++43) (1) 368-24-33 oder (++43) (1) 368-63-52-97
e-mail: thomas.kirisits(a)boku.ac.at
Homepage: http://ifff.boku.ac.at/
Institute of Forest Entomology, Forest Pathology and Forest Protection
Department for Forest and Soil Sciences
BOKU - University of Natural Resources and Applied Life Sciences
Hasenauerstrasse 38
A-1190 Vienna
Austria
Tel.: (++43) (1) 368-24-33
Fax: (++43) (1) 368-24-33 or (++43) (1) 368-63-52-97
e-mail: thomas.kirisits(a)boku.ac.at
Homepage: http://ifff.boku.ac.at/
Please forward to interested parties...
USDA Forest Service, Pacific Southwest Research Station,
2010 Sudden Oak Death Research Request for Proposals
Approximately $500,000 will be available in summer 2010 to fund new
research projects to combat Sudden Oak Death/Phytophthora ramorum.
Deadline for submission is Wednesday, March 31, 2010. For further details
see the attached Request for Proposals or http://www.fs.fed.us/psw/
In 2009, the National Ornamental Research Site was established at
Dominican University of California. (For questions about NORS-DUC, contact
Sibdas Ghosh at sibdas.ghosh(a)dominican.edu or go to
www.dominican.edu/norsduc) Via this Request for Proposals, we
anticipate funding roughly seven projects, including one to be conducted
at this facility.
For more information on Sudden Oak Death see www.suddenoakdeath.org.
- Susan
Susan J. Frankel
Sudden Oak Death Research Program Manager
USDA-Forest Service, Pacific Southwest Research Station
Mailing address:
PO Box 245
Berkeley, CA 94701
Street address:
800 Buchanan Street, West Annex Building,
Albany, CA 94710-0011
Phone: 510-559-6472 FAX :510-559-6440
sfrankel(a)fs.fed.us
Please find attached flyers for a PhD scholarship AND a Post Doctoral
Fellowship to work on various aspects of pest management in pine
plantations in Australia.
The project has three main components: (i) field survey and insect
rearing work to investigate the severity of ips bark beetle damage and
the extent to which it is adversely affecting the current program of
nematode-based biological control of sirex wood wasp (ii) laboratory
studies of the interactions between ips bark beetle, sirex wood wasp and
the fungi and nematodes associated with each (iii) laboratory and field
experiments on possible pest management strategies to reduce the impact
of ips bark beetle. The split of components between the PhD and
postdoctoral fellow will be negotiated according to the background of
the preferred applicants.
Both positions are open to overseas applicants.
If you are interested I can forward you the grant application that was
submitted to win the funds for the project, or feel free to email me
with any queries.
I apologise if you receive this message multiple times due to the 3
mailing lists.
Regards
Angus
Dr Angus J Carnegie | Principal Research Scientist - Forest Health
Primary Industries, Biosecurity Research | Industry & Investment NSW |
Forest Science Centre
121-131 Oratava Ave West Pennant Hills NSW 2125 | PO Box 100 Beecroft
NSW 2119 | Australia
T: 02 9872 0131 | F: 02 9871 6941 | M: 0429 453859 | E:
angus.carnegie(a)industry.nsw.gov.au
W: www.industry.nsw.gov.au <http://www.industry.nsw.gov.au/> |
www.dpi.nsw.gov.au/research/forestry
<http://www.dpi.nsw.gov.au/research/forestry>
DISCLAIMER:
This Email message is for the sole use of the intended recipient and may contain confidential and privileged information. Any unauthorised review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply Email and destroy all copies as well as the original message. All views expressed in this Email are those of the sender, except where specifically stated otherwise, and do not necessarily reflect the views of Forests NSW.
Dear colleagues and friends,
Due to several last-minute requests we are pleased to announce that
the deadline for abstract submission to the The Fourth International
Rusts of Forest Trees Conference has been postponed to February 5th
2010. As a consequence also the deadline for early-registration
payment has been postponed to this date. In the days soon after the
above deadline you'll receive the 2nd circular with all details of the
meeting. Hoping to see you soon in Florence!
Yours sincerely,
Salvatore Moricca and Richard Hamelin
Dear colleagues,
Apologizing for possible multiple messages, I wanted to advertise an
open research associate (technician) position in my lab, available
immediately. The position description and all application
information can be found at http://jobs.osu.edu/. Click on "View OSU
Job Opportunities", then "SEARCH POSTINGS" using requisition number
348627. Application deadline: Jan. 17, 2010.
Please distribute as you see fit to any and all qualified applicants.
Thanks!
Enrico
--
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/
Research Entomologist (Biocontrol and Molecular Biology) Vacancy - USDA
Forest Service, Northern Research Station, NRS-03 Ecology and Management
of Invasive Species and Forest Ecosystems is looking for a Research
Entomologist, GS-11/12 for our laboratory in Hamden CT. The major duties
of the position are:
1. Conducts research and develops new approaches to biological control of
invasive insect pests of trees.
2. Uses modern molecular techniques and DNA-based tools to study the
ecological roles of biological control organisms in their native and
introduced ranges.
3. Conducts laboratory and field experiments to optimize the rearing,
establishment, spread, and impact of biological control agents for
regulating pest populations.
4. Conducts exploration for additional biological control agents of
introduced forest pests as needs arise.
5. Plans and conducts research to understand the multitrophic ecological
interactions that impact biological control efficacy.
6. Analyzes and interprets research results, prepares reports and
manuscripts for publication, and presents papers and talks to professional
and lay audiences.
Research will initially focus on predators of hemlock woolly adelgid, but
opportunities to work on biological control of other invasive insects,
such as Asian longhorned beetle, emerald ash borer, or Sirex woodwasp will
be available.
The Hamden CT area is located just north of New Haven CT and has a
cooperative relationship with Yale University with opportunities to work
with the University community. The position is open to both public (must
be a US citizen to apply) and government employees on USAJOBS. Questions
can be directed to me at the address, phone, or email listed below.
Cheers, Kurt
http://www.usajobs.opm.gov/
Government vacancy announcement - TA10-NRS-EMI-0442G
Public vacancy announcement - TA10-NRS-EMI-0442DP
******************************************************************
Dr. Kurt W. Gottschalk
Research Forester and Project Leader
Ecology & Management of Invasive Species and Forest Ecosystems
USDA Forest Service
Northern Research Station
180 Canfield St.
Morgantown, WV 26505-3180 USA
Phone: 304-285-1598 Fax: 304-285-1505 Cell Phone: 304-276-9750
Email: kgottschalk(a)fs.fed.us Web page:
http://www.nrs.fs.fed.us/units/invasivesecology/
******************************************************************
Hello Colleagues,
The Dec. 31 deadline for submission of abstracts for presentations at the
Congress is approaching. If you would like to present (either oral or
poster) at the Congress, you should submit an abstract by visiting
http://www.iufro2010.com
then click on ?online abstract submission on the right?. You will be
prompted to establish a login ID and password prior to submitting an
abstract.
If you would like to submit an abstract for one of the sessions in our
Congress Theme ?Frontiers in forest and tree health? listed below, we
suggest that you contact the listed session coordinator to make sure that
there is still room in the session, before submitting an abstract with
that session designated.
It is also possible to submit an abstract without designating any of the
existing sessions. To do this, you should still select ?Frontiers in
Forest Health? as the Congress theme but select ?other? as the session.
The Congress Organizing Committee will organize these ?other?
presentations into sessions with similar content.
Finally, plans are being made for a special 2-day post-conference forest
health tour. As part of the tour, we would visit various forest stands
for first-hand view of some of the important insect and disease problems
in Korea. For more information, see
http://www.iufro2010.com/?code=iu06&subp=0201
-Sandy
Theme: ?Frontiers in Forest and Tree Health? (full descriptions can be
found at http://www.iufro2010.com/upload/Congress_Themes_And_Sessions.pdf)
G-01 Forest health in a changing environment
coordinators: Elena Paoletti (e.paoletti(a)ipp.cnr.it) & Mike Wingfield
G-02 New insights into roles of ophiostomatoid fungi in bark
beetle-fungus symbioses
coordinators: Diana Six (diana.six(a)cfc.umt.edu) & Mike Wingfield
G-03 Effect of multiple ecosystem stressors on tree and forest
ecosystem health
coordinator: Nancy Grulke (ngrulke(a)fs.fed.us)
G-04 The growing threat of Australian insect pests to world
eucalyptus plantation forestry coordinator: Simon Lawson
(simon.lawson(a)dpi.qld.gov.au)
G-05 Synergy in forest threats: symbiotic interactions and
invasives
coordinator: Kier Klepzig (Kklepzig(a)fs.fed.us)
G-06 Alien invasive pathogens: threats to forest ecosystem
integrity and services
coordinators: Steve Woodward & Ned Klopfenstein (nklopfenstein(a)fs.fed.us )
G-07 Impacts of interacting disturbances on forest health in the
boreal zone
coordinator: Douglas McRae (DMcRae(a)NRCan.gc.ca )
G-08 Invasive alien species: economic and environmental impacts on
forest ecosystems
coordinator: David Langor (David.Langor(a)NRCan-RNCan.gc.ca )
G-09 Semiochemical based monitoring of forest health
coordinator: Zhang Zhen (zhangzhen(a)caf.ac.cn)
G-10 Trends in wood and bark borer invasions and effects of policy
coordinators: Eckehard Brockerhoff
(Eckehard.Brockerhoff(a)scionresearch.com) & Robert Haack
G-11 Molecular ecological and evolutionary perspectives on changing
populations of forest insects and their symbionts
Session coordinator: Bernard Slippers (bernard.slippers(a)fabi.up.ac.za)
G-12 Oak decline in the world
Session coordinator: Naoto Kamata (kamatan(a)uf.a.u-tokyo.ac.jp) & Kazuyoshi
Futai
G-13 Advances in exotic forest pest surveillance and monitoring
Session coordinator: Jon Sweeney (jsweeney(a)nrcan.gc.ca)
G-14 Ecology and management of pine wood nematode in the face of
climate change
Session coordinators: Yeong-jin (yjchung(a)foa.go.kr) Chung & Han Hyerim
G-15 Cork Oak forest degradation causes and sustainable development
in western Mediterranean countries
Session coordinators: Mohammed Nejib Rejeb (Rejeb.nejib(a)iresa.agrinet.tn)
Abdelhamid Khaldi & Woo Su-Young
G-16 Climate factors and tree susceptibility/resistance to insects
and pathogens
Session coordinators: François Lieutier
(francois.lieutier(a)univ-orleans.fr) & Dan Herms
G-17 Managing cone and seed insects to preserve the regeneration of
future forests
Session coordinator: Jean-Noël Candau (Jean-Noel.Candau(a)NRCan-RNCan.gc.ca
)
G-18 Diseases and insects in pines threatening global forest health
in the 21st century
Session coordinators: Lee Kyung Joon (fraxinus(a)snu.ac.kr ) & Kang Ho Duck
G-19 Forest dieback caused by novel ambrosia beetle/Raffaelea pest
complexes
Session coordinators: Kazuyoshi Futai (futai(a)kais.kyoto-u.ac.jp ) & Naoto
Kamata
-------------------------------------------------------------------------
Andrew Liebhold 304-285-1512
Northern Research Station 304-285-1505 FAX
USDA Forest Service 724-317-8668 mobile
180 Canfield St. aliebhold(a)fs.fed.us
Morgantown, WV26505 USA http://sandyliebhold.com
-------------------------------------------------------------------------------
Please forward this on to any interested parties:
Now available....
Kliejunas, John T.; Geils, Brian W.; Glaeser, Jessie Micales; Goheen,
Ellen Michaels; Hennon, Paul; Kim, Mee-Sook; Kope, Harry; Stone, Jeff;
Sturrock, Rona; Frankel, Susan J. 2009. Review of literature on climate
change and forest diseases of western North America. Gen. Tech. Rep.
PSW-GTR-225. Albany, CA: U.S. Department of Agriculture, Forest Service,
Pacific Southwest Research Station. 54 p.
Online at: http://www.fs.fed.us/psw/publications/documents/psw_gtr225/
Hardcopy. There is NO charge for this publication and to order a free
copy:
Email: rschneider(a)fs.fed.us (include your full mailing address and the
publication name or number)
FAX: (970) 498-1122
Phone: (970) 498-1392
By US Mail: Send your name and address in block format (as if you are
addressing an envelope) to:
Publishing Services
Rocky Mountain Research Station
240 West Prospect Road
Fort Collins, CO 80526-2098 USA
ALSO... we have updated the Annotated Bibliography of Climate and Forest
Diseases of Western North America
http://www.fs.fed.us/psw/topics/climate_change/forest_disease/fdbib/
to add the following publications:
Allen, C.D. 2009. Climate-induced forest dieback: An escalating global
phenomenon?. Unasylva. 231/232 60(1-2): 43-49.
Allen, Craig D.; Breshears, David D. 1998. Drought-induced shift of a
forest?woodland ecotone: rapid landscape response to climate variation.
Proc. Natl. Acad. Sci. USA Vol. 95(25): 14839-14842.
Beier, Colin M.; Sink, Scot E.; Hennon, Paul E.; D'amore, David V.; Juday,
Glenn P. 2008. Twentieth-century warming and the dendroclimatology of
declining yellow-cedar forests in southeastern Alaska. Can. J. For. Res.
38(6): 1319-1334.
Blennow, Kristina; Andersson, Mikael; Sallnäs, Ola; Olofsson, Erika 2009.
Climate change and the probability of wind damage in two Swedish forests.
Forest Ecol. Manage. (2009), doi:10.1016/j.foreco.2009.07.004.
Brenes-Arguedas, Tania; Coley, Phyllis D.; Kursar, Thomas A. 2009. Pests
vs. drought as determinants of plant distribution along a tropical
rainfall gradient. Ecology. 90(7): 1751-1761.
Adams, Henry D.; Guardiola-Claramonte, Maite; Barron-Gafford, Greg A.;
Camilo Villegas, Juan; Breshears, David D.; Zou, Chris B.; Troch, Peter
A.; Huxman, Travis E. 2009. Temperature sensitivity of drought-induced
tree mortality portends increased regional die-off under
global-change-type drought. Proceedings of the National Academy of
Sciences. 106(17): 7063-7066.
Breshears, David D.; Myers, Orrin B.; Meyer, Clifton W.; Barnes, Fairley
J.; Zou, Chris B.; Allen, Craig D.; McDowell, Nathan G.; Pockman, William
T. 2009. Tree die-off in response to global change-type drought: mortality
insights from a decade of plant water potential measurements. Frontiers in
Ecology and the Environment. 7(4): 185-189.
Brodribb, Tim J.; Cochard, Hervé 2009. Hydraulic failure defines the
recovery and point of death in water-stressed conifers. Plant Physiology
149(1): 575-584.
Dukes, Jeffrey S.; Pontius, Jennifer; Orwig, David; Garnas, Jeffrey R.;
Rodgers, Vikki L.; Brazee, Nicholas; Cooke, Barry; Theoharides, Kathleen
A.; Stange, Erik E.; Harrington, Robin; Ehrenfeld, Joan; Gurevitch,
Jessica; Lerdau, Manuel; Stinson, Kristina; Wick, Robert; Ayres, Matthew
2009. Responses of insect pests, pathogens, and invasive plant species to
climate change in the forests of northeastern North America: What can we
predict? . Canadian Journal of Forest Research, Volume 39( 2): 231-248.
Gregory, Peter J.; Johnson, Scott N.; Newton, Adrian C.; Ingram, John S.
I. 2009. Integrating pests and pathogens into the climate change/food
security debate. Journal of Experimental Botany. 60 (10): p. 2827-2838.
Harsch, Melanie A.; Hulme, Philip E.; McGlone, Matt S.; Duncan, Richard P.
2009. Are treelines advancing? A global meta-analysis of treeline response
to climate warming. Ecology Letters. 12(10): 1040-1049.
Klopfenstein, Ned B.; Kim, Mee-Sook; Hanna, John W.; Richardson, Bryce A.;
Lundquist, John E. 2009. Approaches to predicting potential impacts of
climate change on forest disease: an example with Armillaria root disease.
Res. Pap. RMRS-RP-76. Fort Collins, CO: U.S. Department of Agriculture,
Forest Service, Rocky Mountain Research Station. 10 p.
Lake, Janice Ann; Wade, Ruth Nicola 2009. Plant-pathogen interactions and
elevated CO2: morphological changes in favour of pathogens. Journal of
Experimental Botany. 60(11): 3123-3131.
Linton, M. J.; Sperry, J. S.; Williams, D. G. 1998. Limits to Water
Transport in Juniperus osteosperma and Pinus edulis: Implications for
drought tolerance and regulation of transpiration . Functional Ecology.
12(6): 906-911.
Lutz, J.A.; van Wagtendonk, J.W.; Franklin, J.F. 2009. Twentieth-century
decline of large-diameter trees in Yosemite National Park, California,
USA. Forest Ecology and Management. 257(11): p. 2296-2307.
McDowell, Nate; Pockman, William T.; Allen, Craig D.; Breshears, David D.;
Cobb, Neil; Kolb, Thomas; Plaut, Jennifer; Sperry, John; West, Adam;
Williams, David G.; Yepez, Enrico A. 2008. Mechanisms of plant survival
and mortality during drought: why do some plants survive while others
succumb to drought?. New Phytologist. 178(4): 719 - 739.
Millar, C.I.; Westfall, R.D.; Delany, D.L. 2007. Response of
high-elevation limber pine (Pinus flexilis) to multiyear droughts and
20th-century warming, Sierra Nevada, California, USA. Canadian Journal of
Forest Research, Volume 37(12): 2508-2520.
Mueller, Rebecca C.; Scudder, Crescent M.; Porter, Marianne E.; Trotter,
R. Talbot III; Gehring, Catherine A.; Whitham, Thomas G. 2005.
Differential tree mortality in response to severe drought: evidence for
long-term vegetation shifts. Journal of Ecology. 93(6): 1085-1093
Niinemets, Ülo; Valladares, Fernando 2006. Tolerance to shade, drought,
and waterlogging of temperate northern hemisphere trees and shrubs.
Ecological Monographs. 76(4): 521?547.
Six, D.L.; Bentz, B.J. 2007. Temperature determines symbiont abundance in
a multipartite bark beetle-fungus ectosymbiosis. Microbial Ecology. 54(1):
112-118.
van Mantgem, Phillip J.; Stephenson, Nathan L.; Byrne, John C.; Daniels,
Lori D.; Franklin, Jerry F.; Fulé, Peter Z.; Harmon, Mark E.; Larson,
Andrew J.; Smith, Jeremy M.; Taylor, Alan H.; Veblen, Thomas T. 2009.
Widespread Increase of Tree Mortality Rates in the Western United States.
Science. Vol. 323(5913): 521-524.
Walther, Gian-Reto; Roques, Alain; Hulme, Philip E.; Sykes, Martin T.;
Py?ek, Petr; Kühn, Ingolf; Zobel, Martin; Bacher, Sven; Botta-Dukát,
Zoltán; Bugmann, Harald; Czúcz, Bálint; Dauber, Jens; Hickler, Thomas;
Jaroík, Vojtech; Kenis, Marc; Klotz, Stefan; Minchin, Dan; Moora, Mari;
Nentwig, Wolfgang; Ott, Jürgen; Panov,Vadim E.; Reineking, Björn;
Robinet,Christelle; Semenchenko, Vitaliy; Solarz, Wojciech; Thuiller,
Wilfried; Vilà, Montserrat; Vohland, Katrin; Settele, Josef 2009. Alien
species in a warmer world: risks and opportunities. Trends in Ecology &
Evolution - 26 August 2009.
Watt, Michael S.; Kriticos, Darren J.; Alcaraz, Samantha; Brown, Anna V.;
Leriche, Agathe 2009. The hosts and potential geographic range of
Dothistroma needle blight. Forest Ecology and Management Volume 257( 6):
1505-1519 .
West, A. G.; Hultine, K. R.; Sperry, J. S.; Bush, S. E.; Ehleringer, J. R.
2008. Transpiration and hydraulic strategies in a piñon?juniper woodland.
Ecological Applications. 18(4): 911?927.
Zeng, Hongcheng; Chambers, Jeffrey Q.; Negrón-Juárez, Robinson I.; Hurtt,
George C.; Baker, David B.; Powell, Mark D. 2009. Impacts of tropical
cyclones on U.S. forest tree mortality and carbon flux from 1851 to 2000.
Proceedings of the National Academy of Sciences USA. 106(19): 7888-7892.
Please email me if you have suggested publications to add.
- Susan
PS - I apologize to those of you that received several copies of this
message.
Susan J. Frankel
Sudden Oak Death Research Program Manager
USDA-Forest Service, Pacific Southwest Research Station
Mailing address:
PO Box 245
Berkeley, CA 94701
Street address:
800 Buchanan Street, West Annex Building,
Albany, CA 94710-0011
Phone: 510-559-6472 FAX :510-559-6440
sfrankel(a)fs.fed.us
_________________
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_______________________________________________
IUFRO Mailing List
To post a message to all list members, send email to:
rg70300-forent(a)lists.iufro.org
List info and Archive:
http://www.iufro.org/science/iufro-mailing-lists/overview/
