Many thanks to those of you who wrote back about the distinctively striped
foliage disease of aspen.
Mike Schomaker (also in Colorado) said that he has seen this as an early
stage of ink spot, caused by Ciborinia whetzelii. He was initially puzzled
until he saw sclerotia forming in the symptomatic leaves later in the
season. I rechecked a few descriptions of the disease, and an initial
zonate pattern is mentioned briefly but I have not found a photograph of
it.
After incubating my "tiger blight" for 3-4 days, the zonation is beginning
to fade and sclerotia have begun to form (see photo below). So, it looks
like Mike is correct (congratulations, although I was starting to like the
name tiger blight!). I will follow the development in nature through the
summer and see whether it begins to look more like ink spot as usually
pictured.
Thomas Kirisits wrote about Septotinia podophyllina and referred me to
Butin. Luckily I have his books. In Forstpathologie für Studium und
Praxis (1973), he describes and presents a drawing of Ringfleckenkrankheit
der Pappel, caused by Sclerotinia (Septotinia) podophyllina. It makes
somewhat round lesions with concentric banding. It has an asexual stage
(unlike Ciborinia) with large conidia and produces apothecia in the
spring. In Krankheiten der Wald- und Parkbäume (1983), he refers to the
pathogen as Septotinia populiperda. This fungus is closely related to
Ciborinia (both in Sclerotiniaceae) so it is not surprising it might
produce similar symptoms.
Risto Jalkanen referred to a similar disease of unknown etiology he has
seen on Salix caprea. Perhaps it is caused by a related fungus.
Several people suggested the possibility of leaf miner (insect) damage. It
certainly is reminiscent of leaf miner damage (which we actually saw at the
same site), but we (including entomologist Tom Eager) are convinced that it
is not leaf miner.
Thanks again to all who kindly wrote back with assistance or just
excitement!
(See attached file: tiger_incubated_spots_2.jpg)
Jim Worrall
US Forest Service
Rocky Mountain Region
Forest Health Management
216 N. Colorado St.
Gunnison CO, 81230
(970) 642-1166 desk
(970) 390-2352 cell
(970) 642-1919 fax
We have a foliage disease of trembling aspen (Populus tremuloides) in
southwestern Colorado, USA. It is beautiful, strikingly unique, appears to
be causing significant impact, and has me completely baffled. The
foresters who brought it to my attention are calling it "tiger blight"
because of the distinctive striping (see pictures below). It is occurring
mostly on suckers and saplings and lower branches of overstory trees. I
was told that in one regenerating stand of suckers, it is killing 30-40% of
the foliage.
There is no fruiting (perhaps very early initials), but there are hyaline
hyphae in the lesions.
If the striping is caused by alternation between night and day (and I can't
think what else would lead to the zonation), the lesions appear to expand
rapidly.
I put some leaves in a moist chamber to see if anything fruits. In the
meantime, has anyone seen this disease before, or even similar symptoms on
another species?
(See attached file: tiger_4.jpg)
(See attached file: tiger_5.jpg)
(See attached file: tiger_group_1.jpg)
Thanking you in advance,
Jim Worrall
US Forest Service
Rocky Mountain Region
Forest Health Management
216 N. Colorado St.
Gunnison CO, 81230
(970) 642-1166 desk
(970) 209-1332 cell
(970) 642-1919 fax
Dear Jim,
What a beautiful leaf disease!
Could it be Septotinia podophyllina, the only poplar leaf disease I know
where concentric rings occur? I was surprised that it is not mentioned
in the North American "bible" (Synclair & Lyon). The textbook of Butin
has a description and a drawing.
I found a link with a short description of the disease:
http://www.fao.org/docrep/004/AC492E/AC492E06.htm
I also found one reference: Kam, M. de, 1973: Life history, host range
an distribution of Septotinia podophyllinia. European Journal of Forest
Pathology 3: 1-6.
Please let us know what is is, as soon as you know!
Hope this helps.
All best,
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/
>>> James Worrall <jworrall(a)fs.fed.us> 07/13/08 3:17 PM >>>
We have a foliage disease of trembling aspen (Populus tremuloides) in
southwestern Colorado, USA. It is beautiful, strikingly unique, appears
to
be causing significant impact, and has me completely baffled. The
foresters who brought it to my attention are calling it "tiger blight"
because of the distinctive striping (see pictures below). It is
occurring
mostly on suckers and saplings and lower branches of overstory trees. I
was told that in one regenerating stand of suckers, it is killing 30-40%
of
the foliage.
There is no fruiting (perhaps very early initials), but there are
hyaline
hyphae in the lesions.
If the striping is caused by alternation between night and day (and I
can't
think what else would lead to the zonation), the lesions appear to
expand
rapidly.
I put some leaves in a moist chamber to see if anything fruits. In the
meantime, has anyone seen this disease before, or even similar symptoms
on
another species?
(See attached file: tiger_4.jpg)
(See attached file: tiger_5.jpg)
(See attached file: tiger_group_1.jpg)
Thanking you in advance,
Jim Worrall
US Forest Service
Rocky Mountain Region
Forest Health Management
216 N. Colorado St.
Gunnison CO, 81230
(970) 642-1166 desk
(970) 209-1332 cell
(970) 642-1919 fax
Dear Jim,
What a beautiful leaf disease!
Could it be Septotinia podophyllina, the only poplar leaf disease I know
where concentric rings occur? I was surprised that it is not mentioned
in the North American "bible" (Synclair & Lyon). The textbook of Butin
has a description and a drawing.
I found a link with a short description of the disease:
http://www.fao.org/docrep/004/AC492E/AC492E06.htm
I also found one reference: Kam, M. de, 1973: Life history, host range
an distribution of Septotinia podophyllinia. European Journal of Forest
Pathology 3: 1-6.
Please let us know what is is, as soon as you know!
Hope this helps.
All best,
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/
>>> James Worrall <jworrall(a)fs.fed.us> 07/13/08 3:17 PM >>>
We have a foliage disease of trembling aspen (Populus tremuloides) in
southwestern Colorado, USA. It is beautiful, strikingly unique, appears
to
be causing significant impact, and has me completely baffled. The
foresters who brought it to my attention are calling it "tiger blight"
because of the distinctive striping (see pictures below). It is
occurring
mostly on suckers and saplings and lower branches of overstory trees. I
was told that in one regenerating stand of suckers, it is killing 30-40%
of
the foliage.
There is no fruiting (perhaps very early initials), but there are
hyaline
hyphae in the lesions.
If the striping is caused by alternation between night and day (and I
can't
think what else would lead to the zonation), the lesions appear to
expand
rapidly.
I put some leaves in a moist chamber to see if anything fruits. In the
meantime, has anyone seen this disease before, or even similar symptoms
on
another species?
(See attached file: tiger_4.jpg)
(See attached file: tiger_5.jpg)
(See attached file: tiger_group_1.jpg)
Thanking you in advance,
Jim Worrall
US Forest Service
Rocky Mountain Region
Forest Health Management
216 N. Colorado St.
Gunnison CO, 81230
(970) 642-1166 desk
(970) 209-1332 cell
(970) 642-1919 fax
Dear Forest Pathologists,
Our rust specialist, Dr. Hye Young Yun, is seeking for fresh material of
Gymnosporangium as mentioned in the attached file.
If you find this rust fungi, please send to the address below.
Thank you.
Dr. Hye Young Yun
Systematic Mycology & Microbiology Laboratory
USDA-ARS, Rm. 304, B011A
10300 Baltimore Ave.
Beltsville, MD 20705
301-504-5364
Fax 301-504-5810
http://ars.usda.gov/ba/psi/smml
Hello colleagues,
Our plant disease clinic here in Columbus, Ohio, has been observing
higher incidence of Phomopsis spp. associated with tip dieback in
spruce (both Norway and Colorado blue spruce) in the last few years,
whereas the usual culprit used to be cytospora in the past.
Has anyone else observed the same? We are just wondering if this is
something worth following up.
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/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/
We have a double copy of (Plant Disease Reporter) Plant Disease from
1950-1990. It is pretty much complete, though there are a few missing
issues. Would anyone in the US be interested in having these? We have
tried contacting APS but overseas shipment is prohibitive.
Please let me know if you are interested in these before we let them go.
Thanks, Paula
Pauline Spaine
Research Eco-Plant Pathologist
USDA Forest Service
320 Green Street
Athens, Georgia 30602
706-559-4278
pspaine(a)fs.fed.us
Dear Colleagues,
Please circulate to potential graduate students.
A funded Ph.D. position is available immediately to work with me, Dan
Herms, and other collaborators on a project that will use metabolomic
and proteomic approaches coupled with field studies. The project
will be a test of a new ecological model that integrates the
phenomenon of pathogen-induced systemic resistance with the
growth/differentiation balance hypothesis (Bonello et al. 2006, see
attached) in tripartite systems that include Austrian pine (Pinus
nigra), the blight and canker pathogen Diplodia pinea, and two
pestiferous insects, the pine engraver (Ips pini) and the European
pine sawfly (Neodiprion sertifer).
Prospective candidates should have an excellent undergraduate record
in the biological, ecological, or agricultural sciences. A master
degree in tree pathology, entomology, or chemical ecology is strongly
preferred.
Interested students should verify their records against our admission
requirements
(http://plantpath.osu.edu/graduate-programs/prospective-students/graduate-fu…)
before contacting me directly for information regarding the project.
Thank you!
Enrico
Bonello, P., T. R. Gordon, D. A. Herms, D. L. Wood, and N. Erbilgin.
2006. Nature and ecological implications of pathogen-induced systemic
resistance in conifers: A novel hypothesis. Physiological and
Molecular Plant Pathology 68, 95-104
--
-----------------------------------------
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/
Dear Colleagues,
Please circulate to potential graduate students.
A funded Ph.D. position is available immediately to work with me, Dan
Herms, and other collaborators on a project that will use metabolomic
and proteomic approaches coupled with field studies. The project
will be a test of a new ecological model that integrates the
phenomenon of pathogen-induced systemic resistance with the
growth/differentiation balance hypothesis (Bonello et al. 2006) in
tripartite systems that include Austrian pine (Pinus nigra), the
blight and canker pathogen Diplodia pinea, and two pestiferous
insects, the pine engraver (Ips pini) and the European pine sawfly
(Neodiprion sertifer).
Prospective candidates should have an excellent undergraduate record
in the biological, ecological, or agricultural sciences. A master
degree in tree pathology, entomology, or chemical ecology is strongly
preferred.
Interested students should verify their records against our admission
requirements
(http://plantpath.osu.edu/graduate-programs/prospective-students/graduate-fu…)
before contacting me directly for information regarding the project.
Thank you!
Enrico
Bonello, P., T. R. Gordon, D. A. Herms, D. L. Wood, and N. Erbilgin.
2006. Nature and ecological implications of pathogen-induced systemic
resistance in conifers: A novel hypothesis. Physiological and
Molecular Plant Pathology 68, 95-104
--
-----------------------------------------
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/
This year's NORTHEAST FOREST PATHOLOGY WORKSHOP will be help in conjunction
with the IUFRO Alien Invasive Species and International Trade, May 27-28,
2008, at the National Conservation Training Center (NCTC) in Shepherdstown,
WV.
In addition to attending IUFRO sessions on Tuesday, we will meet as a group
Tuesday evening to share station reports. Wednesday is the field trip which
Kurt Gottschalk is arranging.
The field trip on the 28th will leave NCTC at 7 am and go to the Baltimore,
MD area. We will stop at an urban forest/park area in Baltimore where we
will see invasive plant, insect, and disease problems within the urban
setting. From there we will proceed to the Port of Baltimore, the 14th
largest port in the US. We will tour the port operations and hear from the
people who work there inspecting cargo and preventing invasive species from
entering the US. We will have a box lunch at a scenic recreation spot just
outside of Baltimore. After lunch, we will go to Catoctin Mountain Park, a
National Park located north of Frederick, MD. At the park, we will stop at
the visitor's center and then head to the woods to see how the forests of
the park have been impacted by invasive species including chestnut blight,
gypsy moth, dogwood anthracnose, hemlock woolly adelgid, and invasive
plants. From the park it will be a short bus ride back to the NCTC for
dinner.
If you have already registered with Kerry Britton for the IUFRO meeting, I
don't need any response from you. If you prefer just to attend just Tuesday
and Wednesday, then YOU NEED TO SEND ME AN EMAIL WITH THE FOLLOWING BY APRIL
22 (extended deadline).
Name(s) (include a name for each person needing to register):
Lodging: NCTC or elsewhere
Nights for lodging at the NCTC: May 27, 28; other?
After I receive this information, I'll notify you on how to pay the
registration costs and to make the NCTC reservations.
Registration cost for the 2-day workshop will be $50, and each night's
lodging at the NCTC is $110 which includes all meals.
Let me know if you have questions. Again, notify me by April 22 if you want
to attend.
--
Dr. William H. Livingston
Associate Professor of Forest Resources
School of Forest Resources
University of Maine
5755 Nutting Hall, rm 116
Orono, ME 04469-5755
USA
ph: 207-581-2990
fx: 207-581-4257
Email: WilliamL(a)maine.edu
Web: http://www.forest.umaine.edu/
