2002 Sessions Sponsored by Forest Pathology Committee

Forest Pathology Field Trip
8:00 a.m. - Friday, July 26 - 6:00 p.m. - Saturday, July 27

Participants will visit the Menominee Nation and view majestic white pine and northern hardwood forests in northeastern Wisconsin. The Menominee Reservation, where sustained-yield forestry has been practiced for over 140 years, is truly a gem in the forests of eastern North America. Our visit also will include a stop at the Menominee Logging Camp Museum. The second day will be spent meandering south to Milwaukee. Diseases that we expect to see and discuss during these two days include white pine blister rust and red ring rot, butternut canker, hardwood trunk decays, Armillaria root disease, oak wilt, shoot diseases of conifer plantations/Christmas trees, and others as nature provides and time permits. This field trip is open to all meeting registrants.

Field trip attendees arriving by air will need to fly into Green Bay (Austin Straubel International Airport) and plan to depart from Milwaukee after the APS meeting. Van service from Green Bay to Keshena will be provided on Thursday. Ticket price of $125 includes transportation, one dinner, two lunches, other refreshments, and museum admission; lodging for two nights at the Menominee casino and hotel must be separately reserved and paid for by registrants.

Additional details:

Friday morning our trip will begin after meeting foresters from Menominee Tribal Enterprises and receiving an introduction to the forest resource of the Menominee nation. We intend to spend all of Friday observing forest operations and diseases on Menominee lands, and will also visit a logging museum. A box lunch will be provided and a banquet and some relaxation is planned for Friday evening. Travel on the reservation will be in our air-conditioned bus; individual vehicles will not be allowed to trail behind the bus on Friday.

On Saturday morning we will leave check out of the Menominee Casino and Hotel, load the bus, and leave the Menominee nation. Cars may follow if necessary. Several field stops and lunch stop (box lunch provided) will occur along the trip of approximately 150 miles south to Milwaukee. Arrival in Milwaukee where participants will be dropped off at the annual meeting hotels is planned for 6 pm.

Field trip participants should plan on departing from Milwaukee after the meeting. There is no provision being made by the field trip organizers for transportation back to Green Bay or Keshena. Thus, if traveling by air, make your reservation to arrive in Green Bay for the field trip and to return home from Milwaukee (MKE, General Mitchell International Airport).

Symposium: Chestnut Blight: A 10-Year Study of Disease Management Using Hypoviruses
Sponsoring Committee: Forest Pathology
Co-Sponsoring Committee(s): Biological Control, Epidemiology, Regulatory Plant Pathology
Organizer: Jane Cummings Carlson, DNR, Fitchburg, WI

Chestnut blight caused by Cryphonectria parasitica is responsible for the demise of the chestnut forests of eastern North America and Europe. In the 1960s chestnut trees surviving chestnut blight were observed in Italy. These trees were infected with strains of the fungus infected with hypoviruses that reduce the virulence of the pathogen. A large stand of American chestnut trees in West Salem, WI, became infected with chestnut blight in 1987. After a brief attempt at eradication, hypoviruses were introduced in 1992 and their dissemination followed through the stand for the past decade. While virulent strains still predominate and are infecting previously healthy trees, data suggest the hypoviruses are disseminating and that trees are beginning to respond with wound callus.

Ecological history and early disease management of an isolated stand of American chestnut in
Wisconsin. J.E. CUMMINGS CARLSON (1), F.L. Paillet (2), and S.E. Dahir (1). (1) Wisconsin Dept. of Natural Resources, Madison; (2) U.S. Geological Survey, Denver, CO
The decision to disseminate hypovirulent strains at West Salem: The Michigan experience. D.W.
FULBRIGHT. Michigan State University, East Lansing
Clonal population structure and reproductive biology of Cryphonectria parasitica. I.C. MCGUIRE
and M.G. Milgroom. Cornell University, Ithaca, NY
Hypovirus deployment, establishment and spread: Results after six years of canker treatment. M.L.
DOUBLE and W.L. MACDONALD. West Virginia University, Morgantown
Spatial patterns of blight and hypovirus spread within the West Salem chestnut stand. A.M.
JAROSZ (1), S.E. Dahir (2) and M.L. Double (3). (1) Michigan State University, East Lansing; (2) Wisconsin Dept. of Natural Resources, Madison; (3) West Virginia University, Morgantown
Evaluation of recovery at the West Salem chestnut stand: A demographic analysis. A.L. DAVELOS
(1), A.M. Jarosz (2), S.E. Dahir (3), and J.E. Cummings Carlson (3). (1) University of Minnesota, St. Paul; (2) Michigan State University, East Lansing; (3) Wisconsin Dept. of Natural Resources, Madison
Chestnut breeding and hypovirulence: Integrated approaches to the restoration of the American
  chestnut. J.H. CRADDOCK. University of Tennessee, Chattanooga
Symposium: Forces that Shape Microbe Populations in Forest Ecosystems
Sponsoring Committee: Forest Pathology
Co-Sponsoring Committee(s): Environmental Quality and Plant Health
Organizers: Mee-Sook Kim, University of Idaho, Moscow, and Ned Klopfenstein, USDA Forest Service, Moscow, ID

Forest ecosystems present a unique opportunity to study forces that shape microbial populations. This symposium is designed to reflect understanding of population genetic processes of forest microbes and to contrast these processes with those of microbes in agricultural ecosystems. Several examples of population structure of forest pathogens will be presented and implications for disease management will be discussed.

Introduction. N.B. KLOPFENSTEIN, USDA Forest Service, Moscow, ID
Forces shaping pathogen population structure in crop ecosystems: Relevance to forest ecosystems?
C.C. MUNDT. Oregon State University, Corvallis
Crawling through the botryosphaerial mire: Species definition as a prelude to population studies.
G.R. STANOSZ, D.R. Smith, and S. Zhou. University of Wisconsin, Madison
Genetic variation and potential for adaptation and gene flow in Cronartium ribicola. P.J. ZAMBINO
(1), R. Hamelin (2), and G.I. McDonald (1). (1) USDA Forest Service, Moscow, ID; (2) Natural Resources Canada, Sainte-Foy, QC
Toward defining Armillaria populations and determining relationships to ecological behavior. M.-S.
KIM (1), N.B. Klopfenstein (2), J.W. Hanna (1,2), and G.I. McDonald (2). (1) University of Idaho and (2) USDA Forest Service, Moscow, ID
Swiss needle cast-Climate, forest practices, and pathogen genetics create an epidemic. L.M.
WINTON, J.K. Stone, E.M. Hansen, and P.W Reeser. Oregon State University, Corvallis
Life in the woods and in wood products: Genetic tales from the ophiostomatoid front. L. BERNIER.
CRBF, Université Laval, Québec, QC, Canada
Forest clearing and fire exclusion and their impact on microbial populations: Examples from tropical
and temperate forests. M. GARBELOTTO (1), W. Otrosina (2), I. Chapela (1), and G. Gilbert (3). (1) University of California, Berkeley; (2) U.S. Forest Service, Athens; (3) University of California, Santa Cruz
Phenotypic plasticity and ecotypic adaptation: Responses of microbial populations to environmental
and host variation through time and space. G.I. McDONALD. USDA Forest Service, Moscow, ID

Discussion: Sudden Oak Death: A New Disease Reported On Oaks and Rhododendrons
Sponsoring Committee: Forest Pathology
Co-Sponsoring Committee(s): Regulatory Plant Pathology, Diseases of Ornamental Plants, Mycology
Organizer: Sue Cohen, USDA-APHIS, St. Paul, MN

This session will provide a discussion forum on the impacts of a newly described fungal pathogen, Phytophthora ramorum (Sudden Oak Death) on the forest ecosystems and ornamental nursery industry in the United States. This disease has caused significant mortality in tanoak (Lithocarpus densiflorus), coast live oak (Quercus agrifolia), and California black oak (Q. kelloggii) species in the coastal areas of central California. Speakers will review and discuss the current research studies on the pathogen biology, host range, survey methodology, and treatments for disease control.

Introduction. S. COHEN, USDA-APHIS, University of Minnesota, St. Paul
A molecular approach to the study of the distribution, host range, and variability across populations
of Phytophthora ramorum. M. GARBELOTTO. University of California, Berkeley
Epidemiology of Phytophthora ramorum (Sudden Oak Death) in California oak woodlands. J.
DAVIDSON. University of California, Davis
Monitoring and detection of Sudden Oak Death in forest environments. B. TKACZ. U.S. Forest
Service, Washington, DC
Infectivity of Phytophthora ramorum on selected ericaceous host species. P. TOOLEY.
USDA-ARS, Ft. Detrick, MD
Plants, trade, and the pest parade: Industry perspectives on international movement of plant
propagative materials and plant pests like Sudden Oak Death. C. REGELBRUGGE. American Nursery and Landscape Association, Washington, DC
Risk assessment as a tool for change: Impacts on regulatory issues of Sudden Oak Death. S.