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
Dear all,
**** Please forward to all those who might be
interested, and please excuse possible cross
posting ****
Semiochemicals in Pest Control and Conservation Biology
Graduate student (also post-docs are welcome)
course on the applications of pheromones,
kairomones and other semiochemicals.
Organized by the Department of Ecology, Lund
University and the Department of Plant Protection
Biology, Swedish University of Agricultural
Sciences. The course will take place in Lund,
Sweden, 15-26 March 2010.
Scope
Since the first identification of a pheromone
fifty years ago the world of chemical signals has
received much attention from scientists in
biology, chemistry and agriculture/forestry. Many
of the findings have come into practical use,
mainly for monitoring or suppression of insect
pests. Yet, a very small fraction of crop
protection is based on semiochemicals, despite
their obvious advantages over conventional
insecticides. Why is this and what can be done to
increase the applied use of these sustainable
alternatives? More recently other possibilities
to use odour signals have become obvious in e.g.
detection of rare species. Can this be developed
and used more widely in conservation biology?
These are issues that will be dealt with during
the course, which includes lectures of
internationally recognized scientists, student
presentations, exercises and discussions.
For more info and registration:
http://www.pheromone.ekol.lu.se/semiochem-10.html
Registration deadline is 1 February 2010, maximum enrollment 40 persons.
Best regards,
Olle and Fredrik
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Olle Anderbrant, Prof. telephone +46 (0)46 2224997
Department of Ecology mobile +46 (0)70 3724997
Lund University
Sölvegatan 37 telefax +46 (0)46 2224716
SE-223 62 Lund e-mail Olle.Anderbrant(a)ekol.lu.se
Sweden
internet http://www.pheromone.ekol.lu.se/oa_homepage.html
On behalf of the IUFRO WORKING PARTY 7.03.10 - METHODOLOGY OF FOREST INSECT AND DISEASE SURVEY IN CENTRAL EUROPE we would like to invite you to our Workshop on "Biotic Risks and Climate Change in Forests" in September 2010 and appreciate if you will submit papers/posters on the following subjects:
- Risk assessment of actual and introduced pests and diseases
- Survey of actual and introduced pests and diseases
- Information platform on pests and diseases occurrence.
Please send your abstract online to: http://www.biotic-risks-2010.de/index.php?site=40 (Registration/ Preliminary Registration)!
We are looking forward to hear from you.
Yours faithfully,
Elli Mindnich
_________________________________________________
Forstliche Versuchs- und Forschungsanstalt
Baden - Württemberg
Wonnhaldestrasse 4
79100 FREIBURG
FON 0761 4018 190
FAX 0761 4018 333
I have written a biography of A.D. Hopkins for Heritage, American
Entomologist, entitled: Beginnings of American Forest Entomology: The
role of Andrew Delmar Hopkins (1857 -1948). I wish to suggest reviewers
to the subject editor when the manuscript is submitted. Please contact
me at MalFurniss(a)turbonet.com if you are interested and available should
the subject editor decide to send it to you. Thanks.............Mal
Please post the enclosed outreach notice for an entomology position with
the Forest Service. Thank you.
<><><><><><><><><><><><><><><><><><>
Terry Wagner
Team Leader -- Termites
201 Lincoln Green
Starkville, MS 39759
Phone: (662) 338-3112
FAX: (662) 338-3101
Email: twagner01(a)fs.fed.us
<><><><><><><><><><><><><><><><><><>
Hello colleagues,
Please circulate as you see fit the attached advertisement for two
postdoctoral positions available immediately at the Ohio State
University to work on the "omics" of ash resistance to the emerald
ash borer.
Some of you may have seen a similar advertisement a couple of months
ago for a postdoctoral opening for someone to work on pine. That
position is separate and in addition to the two advertised here.
Please let me know if you have any questions on this matter. I
apologize in advance for any duplication of messages coming through
both forent and forpath.
Thank you!
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/faculty-and-staff/faculty-directory/bonello-pierlu…
Environmental Science Graduate Program (ESGP)
http://esgp.osu.edu/
Plant Molecular Biology and Biotechnology Program (PMBB)
http://pmbb.osu.edu/
Second Call - Call for Abstracts
IUFRO 7.01.00 RG Conference
Adaptation of Forest Ecosystems to Air Pollution and Climate Change
24th IUFRO Conference for Specialists in Air Pollution and Climate
Change Effects on Forest Ecosystems
March 22-26, 2010; Antalya, TURKEY
Session titles of the conference are:
I. Response indicators and mechanisms of action
II. Water cycles
III. Soils and nutrient cycles
IV. Reproduction, succession and molecular approaches
V. Monitoring
VI. Modelling and risk assessment
VII. Ecological impacts and genetic aspects
VIII. Social and political aspects including ecosystem services IX.
Integrated assessment of anthropogenic stressors and adaptations
of forest ecosystems under temperate and xeric conditions
Deadline for abstract submission is 15th of November 2009
Contact Yusuf Serengil serengil(a)istanbul.edu.tr
Conference web page;
http://www.orman.istanbul.edu.tr/ormankonferans/index.php/2/iufro
Hello Colleagues,
At long last, I attach the September, 2009 issue of the IUFRO Research
Group 7.03.00 "Entomology" Newsletter. There are bits of information
there that should be of interest to all forest entomologists. Please pass
this along to other interested people. Thanks.
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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
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