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:
- The most current information on the signs/symptoms of LRR as well as the biology of the causal pathogen, and,
- 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