PNW-ISA Laminated Root Rot Management in Urban Forests - SOLD OUT
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This workshop is SOLD OUT.

 Export to Your Calendar 10/28/2020
When: Thursday, October 29, 2020
9:00 AM
Where: Rotary Field House at South Surrey Athletic Park
2197 148 St
Surrey, BC  V4A 9P5
Contact: 503-874-8263

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This one-day workshop will be of use to anyone interested in managing laminated root rot (LRR; caused by the pathogen Phellinus sulphurascens) in urban forests or timber production areas of the Pacific Northwest and British Columbia. This workshop occurs within the setting of an urban coastal Douglas-fir forest where LRR has been intensively managed for over the past 14 years.

The intent of the workshop is to provide arborists and foresters alike with a comprehensive understanding of:

  1. The most current information on the signs/symptoms of LRR as well as the biology of the causal pathogen, and,
  2. Techniques on how to best detect, assess and manage long-term LRR impacts in the context of different land management situation.

Tree mortality and forest structure impacts associated with LRR are extremely difficult to manage in Douglas-fir forests. Disease sources can persist for decades in the roots of host trees and provide a long-term threat to the health, structure and stability of maturing forests. The activity of this disease that can result in large areas of conifer forest cover shifting to those dominated by brush and deciduous tree species. Inaccurate detection and ineffective management treatments allow disease spread and increase associated impacts over time.

With the spread of LRR occurring on the roots of host tree species, it is it impossible to determine the exact location of infected wood tissues without large-scale soil excavations. The most practical approach to identifying potentially diseased trees and associated disease management areas is to use above-ground signs and tree crown symptoms. Disease signs and symptoms can at times be subtle and quite variable due to numerous, site-related factors including forest age, site history, geographic situation, site moisture/ nutrient conditions, tree species mixes, site disturbances and hazard tree removal activities. The failure to appropriately account for these influences can result in inaccurate disease assessments, unsuccessful management treatments and long-term impacts to forest health and stability.

This all-day workshop has morning lectures in the Rotary Field House of South Surrey Recreation Center complex and afternoon field sessions in the Sunnyside Acres Urban Forest. In-class lectures will cover pathogen biology along with disease detection, assessment and management techniques. This session will also provide background information on the field site and describe the successes and challenges experienced during 14 years of LRR management activities.

The afternoon field session will demonstrate approaches to LRR identification and disease control techniques implemented to date in the area’s coastal Douglas-fir forests. In-depth discussions will be undertaken on the lessons-learned from these disease control measures.


Location: Rotary Field House at South Surrey Athletic Park, 2197 148 St, Surrey, BC, V4A 9P5, Canada

  • 9:00 am – 9:15 am - Pathogen taxonomy and its impact on the interpretation of literature on the identification and distribution of LRR on a local and global basis.
  • 9:15 am – 9:30 am - Host species susceptibility and the role/impacts of LRR in urban and 'industrial' forests.
  • 9:30 am – 9:45 am - Introduction to forest disease-related terms and key LRR signs and symptoms.
  • 9:45 am – 10:00 am - Information on factors affecting disease incidence and spread; including disease biology, site and host conditions, and human activities.
  • 10:00 am - 10:15 am - Common disease management approaches in timber production (“industrial”) forests and their applicability to urban forests.
  • 10:15 am - 10:30 am - Overview of potential impacts of climate change on LRR and other forest diseases.
  • 10:30 am - 10:45 am - Break
  • 10:45 am - 11:00 am - Introduction to the Sunnyside Acres Urban Forest (SAUF)
  • 11:00 am - 11:15 am - Introduction to laminated root rot management actions taken at the SAUF
  • 11:15 am - 12:00 am - Historical account of treatment assessment findings and recommendations over 15 yrs
  • 12:00 am - 12:15 am - Introduction to risk assessment tools related to laminated root rot
  • 12:15 pm – 1:00 pm - Lunch
  • 1:00 pm – 4:30 pm - *Field component - participants split into two groups that switch between instructors*
  • 1:00 pm – 2:00 pm - Pathogen and disease identification – signs, symptoms and host interactions
  • 2:00 pm – 2:15 pm - Disease management approaches used in rural timber production forests
  • 2:15 pm – 4:00 pm - Review of SAUF disease management activities –pros and cons discussions
  • 4:00 pm – 4:30 pm - Exercise in the application of risk assessment tools related to laminated root rot

What to Bring

  • Footwear for off trail walking (required)
  • Hard hat (recommended)


Rona N. Sturrock is a Retired Research Scientist of Forest Pathology. She has a BSc from UVIC (1983) and a Master of Pest Management degree from SFU (1989). Rona was with the Canadian Forest Service (CFS), Victoria BC for 30 years (1986-2016). During that time, she conducted research on forest pathogens of nursery-grown coniferous seedlings and helped provide extension services in this area (1986-1988). From 1989 to 1990 she was seconded to a program assisting BC First Nations develop and manage their forest resources. From 1991-2016 Rona conducted research on the Laminated root rot (LRR) fungus, Coniferiporia sulphurascens (synonyms include: Phellinus sulphurascensPhellinus weiriiPhellinidium weirii and Poria weirii). Rona’s research papers, reports, and guides on LRR cover aspects of disease management, the biology and diversity of Csulphurascens, and molecular aspects of the Csulphurascens-Douglas-fir interaction. Rona has also investigated and reported on forest diseases and climate change and on decay of western redcedar. Her publications on this variety of subjects number approximately 60.

Jeff Fournier is a retired 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.