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Common Fungi Affecting PNW Trees and Implications for Tree Risk Assessment

October 30 @ 9:00 am - 4:00 pm
Instructor: Julian Dunster and Jeff Fournier


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 Sunnyside Forest and Rotary Field House located at the South Surrey Recreation Center complex. Morning lectures will cover visual assessment techniques for disease, using a combination of signs and symptoms of common diseases in native PNW trees.

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 discussed, and sonic tomography and resistance drilling will be demonstrated as examples of advanced risk assessment techniques.

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


Location: Rotary Field House at South Surrey Recreation Center Complex, 2197 148 St, Surrey, BC, V4A 9P5, Canada

  • 9:00am - 9:30am - Tree Disease and Implications for Risk and Management
  • 9:30am - 9:45am Break
  • 9:45am - 12:00pm - Review common fungi affecting PNW Trees. Examples presented and passed around. Each common fungi will be discussed.
  • 12:00pm - 12:30pm Lunch break
  • 12:30pm - 4:00pm Outdoor field investigations to identify common fungi


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.

Jeff Fournier is a Registered Professional Forester with over 30 years of forest health management experience in both industry and the provincial government.  He has worked as Regional Forest Pathologist, entomology consultant/researcher,  silviculture forester/planner, pesticide specialist amongst other roles.  Jeff has a Bachelor of Science in Forestry as well as a Masters of Pest Management. His masters thesis researched the control the spread of Phellinus weirii in immature Douglas-fir forests though tree felling.  Since 2004, Jeff has acted as a consultant for City of Surrey managing laminated root rot in urban forests.

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.

Allied Professionals are members of allied organizations. See our list of qualifying organizations.


Rotary Field House at South Surrey Athletic Park
2197 148 St
Surrey, British Columbia V4A 9P5 Canada
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