|2001 North Central Forest Pest
Workshop-Oak Wilt Breakfast Discussion
October 4, 2001
|Dr. Jenny Juzwik led the
discussion, and about 20 other people from State natural resource agencies,
universities, federal agencies, and private industry participated. The purpose
of the discussion was to share information and identify ways in which people
throughout the region can more effectively manage oak wilt disease. The
discussion centered on the topic areas of detection/monitoring, education, and
- A small group of State representatives has been
organized to look at opportunities for funding for a demonstration project for
detection of OW using satellite imagery, color IR photos, and other
technologies. They will probably compare rural and urbanizing areas. In the
first instance, they are seeking funding for a USDA FS Technology Development
- The methods developed through this project may
ultimately be useful to get data to fill gaps on behavior of OW disease (e.g.
how it moves in mixed hardwood stands on different soil types)
- Graham Mahal is finishing up an MSc project at the
University of Minnesota, comparing root graft barrier placement models. This
should yield valuable information on placement of barriers, as well as how well
the barriers work. The equipment (combined electronic distance measuring and
GPS system) Graham has been using may be available for further projects down
the line-contact Joe O'Brien at the USDA FS if you are interested in a
collaborative project using this equipment.
- Frank Sapio reported that Michigan is developing a
web-reporting system for people to submit information on oak wilt finds.
Control Actions (Updates, limitations)
- Bruce Moltzan suggested that in Missouri one of their
greatest OW management needs is to develop an education program for the
- Several resources are available for education,
- -- Jane Cummings
Carlson's chapter in the new APS Press "Wilt Diseases" book.
- -- Rich Hauer (MN
Dept of Ag) has compiled a list of resources
- --The St. Paul Field
Office of the USFS hosts an oak wilt website
- -- Michigan State
University has just developed a new extension pub on OW
- -- A couple of years
ago Linda Haugen pulled together a slide set on OW
- Joe O'Brien should
be asked to update the OW website to have links to these and other
- Linda Haugen should
put the slide set into a powerpoint presentation and make it available on the
website. Jenny Juzwik will assist with getting proper releases for the
- Herbicides: Linda Haugen provided a brief summary of
recent herbicide studies. If the root crowns of a buffer zone of trees around
an OW pocket can be rapidly and effectively killed with herbicides, it will
form a barrier to movement of the OW fungus through root grafts. Herbicide
combinations have been identified that effectively kill trees, but the root
crowns are not rapidly killed. Without a method to rapidly kill root crowns,
herbicides have limited promise.
- Plowing/Trenching: Barriers to use include political
problems (particularly in Michigan) and economic constraints.
- Michigan is interested in funds for private
implementation of trenches-it was pointed out that they would probably need to
work through the DNR to get suppression funding from the US Forest
- Phil Marshall suggested that there is the potential
to seek urban forestry $ for trenching, rather than just relying on forest
health sources of funds.
- There is a data gap on the depth needed to form an
effective barrier when using a backhoe.
- Propiconazole: There is a tremendous need for data to
validate recommendations on the use of propiconazole for the prevention of OW.
Jenny Juzwik is pursuing getting $ to implement a study on this.
- Insect Vectors: Much progress has been made on
identifying the probably vectors of OW.
- There is potential to develop pheromone traps to
determine the active period of insect vectors.
These notes captured the gist of the discussion at
NCFPW-if you have questions about the context or more details on any of these
topics, let one of us know
||Linda Haugen (email@example.com)