1. Douglas-fir Bark Beetles Assessing the impacts of Douglas-fir Bark Beetle infestations in the Cariboo-Chilcotin.
2. Sponsored by: Ministry of Forests and Range Steve Baumber, Forest Health Information Specialist Tim Ebata, Forest Health Initiatives Officer Leo Rankin, Forest Entomologist
3. The Douglas Fir Beetle is endemic to southern British Columbia.
4. Douglas Fir Beetles Adult Boring dust can be found in crevices and at the base of Douglas Fir. Larval tunnels can be seen fanning out from the main tunnel in infected wood. Larvae
6. Forest Coverage in the Williams Lake Study Area (from VEG_COMP_LYR_R1_POLY). Source: Ministry of Forests Bark Beetle Management Guidebook, 1995
7. Hazard Ratings in the Williams Lake Area. Source: Ministry of Forests Bark Beetle Management Guidebook, 1995
8. Hazard Rating = A*G*D*Pwhere:A = AgeG = Growth RateD = Tree DiameterP = Stand Purity From: A Susceptibility and Risk Rating System for the Douglas-fir Beetle in British Columbia. Draft version 10, April 2001. T.L. Shore and L. Safranyik. Canadian Forest Service, Pacific Forestry Centre, Victoria, B.C.
9. Hazard Ratings in the entire study area. Source: Ministry of Forests Bark Beetle Management Guidebook, 1995
10. Douglas-fir bark beetle overview survey data for 2007, Williams Lake Study Area. Source: Ministry of Forests Bark Beetle Management Guidebook, 1995
13. One pest may be hidden or masked by another: i.e. Douglas-fir bark beetle is thought to be underreported in the past as it was hidden by large amounts of Spruce Budworm.
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15. Douglas-fir bark beetle overview polygons 2000 – 2009, ChilcotinRiver Study Area. Trace = 1; Low = 2; Moderate = 3; Severe = 4; Very Severe = 5 Source: Ministry of Forests Bark Beetle Management Guidebook, 1995
16. Areas with cumulative scores >= 6, Chilcotin River Study Area. Source: Ministry of Forests Bark Beetle Management Guidebook, 1995
17. Hazard Class, Chilcotin River Study Area. Source: Ministry of Forests Bark Beetle Management Guidebook, 1995
18. Overlay of severe incidence on Hazard Class polygons (derived from continuous forest cover dataset). Source: Ministry of Forests Bark Beetle Management Guidebook, 1995
19. At Risk Polygons, Chilcotin River Study Area. Source: Ministry of Forests Bark Beetle Management Guidebook, 1995
20. Risk Polygons, Williams Lake Study Area. Source: Ministry of Forests Bark Beetle Management Guidebook, 1995
21. Hazard Class: VL = 2.5 % Mortality; L = 19% Mortality; M = 49.5% Mortality; H = 83% Mortality.
22. Risk Polygons, 100 Mile House Study Area (Canoe Creek). Source: Ministry of Forests Bark Beetle Management Guidebook, 1995
23. Forest Composition, 100 Mile House Study Area (Canoe Creek). . Source: Ministry of Forests Bark Beetle Management Guidebook, 1995
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25. Or the biogeoclimatic situation in this administrative unit could be fundamentally different, causing Douglas-fir and bark beetle to behave in different ways…*No source here, just word of mouth!
28. Mature Douglas-fir stands have a thick canopy which shelters deer from heavy snowfalls and provides winter food in the form of needle and branch blow down. After attack by Douglas-fir beetle or other pests the forest can no longer provide these essential functions. Source: Ministry of Forests Bark Beetle Management Guidebook, 1995
29. High Stand Structure Mule Deer Winter Range, Chilcotin River Study Area. Source: Ministry of Forests Bark Beetle Management Guidebook, 1995
30. High Stand Structure Mule Deer Winter Range, 100 Mile Study Area (Canoe Creek). Source: Ministry of Forests Bark Beetle Management Guidebook, 1995
31. High Stand Structure Mule Deer Winter Range, Williams Lake Study Area. Source: Ministry of Forests Bark Beetle Management Guidebook, 1995
32. Old Growth Management Areas, Williams Lake Study Area. Source: Ministry of Forests Bark Beetle Management Guidebook, 1995
33. Visual Quality Objective Designated Scenic Areas, Williams Lake Study Area. Source: Ministry of Forests Bark Beetle Management Guidebook, 1995
44. Or their most suitable food source (big old trees) has been left for them in rugged areas such as river valleys) where it also has to serve the needs of Mule Deer and many other ecological and recreational functions.
Most severe bark beetle infestations are in the Very Dry, Mild subtype. Is this because: Bark beetles like this biogeoclimatic zone? or This zone occurs in river valleys and the bugs like river valleys (maybe they migrate down corridors)? or This just happens to be where all the older purer stands of Douglas-fir are located and that’s what the bugs are after.
