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Location: Seward Park Audubon Center, Garry Oak Room

This course will be of use to anyone interested in tree diseases, and particularly anyone conducting risk assessment of trees with disease.

Arborists and foresters conducting tree risk assessments need to:

1. Know what to look for, and
2. Know what they are looking at.

Fungi affecting trees show considerable variability in form and their ability to cause decay. Part of that variability is driven by the species of tree and fungus, the age and vigor of the tree, the extent of the fungal attack and associated decay, and the ability of the tree to compartmentalize the invading pathogens. Understanding the CODIT process is integral to understanding where decay may be within the tree. Minimizing bark scaring from park or forest management activities reduces the creation of fungal infection courts that threaten long-term tree health.

Improve your tree disease field assessment skills in this all-day class at Seward Park Environmental and Audubon Center. Morning lectures will cover visual assessment techniques for disease, using a combination of signs and symptoms of common diseases in native PNW trees. Sonic tomography and resistance drilling will be discussed as examples of advanced risk assessment techniques.

In the afternoon, we will be outdoors examining diseases of Douglas-fir, western hemlock, western red cedar, bigleaf maple, and Pacific madrone. The types of wood decay, fungus fruiting bodies, as well as structural and risk implications will be covered.

The diseases to be covered will include Phaeolus schweinitzii, Heterobasidion occidentale, Armillaria ostoyae, Porodaedalea pini, Kretzschmeria deusta, Phellinus sulphurascens, Neofusicoccum arbuti and others.

Instructors

Dr. Julian Dunster has unique academic and professional qualifications. He is a Registered Consulting Arborist, a Registered Professional Forester, and a Registered Professional Planner, and in addition to two degrees in forestry, he holds a Doctorate in Regional Planning and Resource Development. Julian has over thirty years of hands on experience from assignments all over the world, and his innovative work has been recognized with many awards. Julian uses these qualifications and expertise to provide you with practical, science based information, combined with a pragmatic understanding of what will or will not work well.

Bob Edmonds is Professor Emeritus at the University of Washington. His research interests focus on forest soil microbiology (especially decomposition, nutrient cycling processes, and mycorrhizae) and forest pathology (especially root and canker diseases). He has conducted research and mentored student research on air pollution and its effects on trees, aerobiology, precipitation and stream chemistry, soil and coarse woody debris invertebrates, and the influence of biosolids on forest soils. Bob’s root disease research has focused on three important conifer root disease organisms, Heterobasidion annosum, Armillaria ostoyae, and Phellinus weirii, with an emphasis on their ecology and management.

Refund Policy

• Cancellations made at least 10 days prior to the event will be refunded at 100%.
• Cancellations made within 5-9 days of the event will be refunded at 75%.
• Cancellations made within 1-4 days of the event will be refunded at 50%.
• Refunds will not be made available for no-shows.

Late Registration

• Participants are expected to enroll prior to the registration deadline.
• Participants can register at the door of the event only if space is available. Individuals will need to pack their own lunch.
• Late registration is possible on a space available basis. You can contact our office at (800) 335-4391. There may, or may not be, room available for those who show up without registering ahead of time for the workshop. We encourage you to register for the workshop in advance.