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Deciduous Defoliators Aspen serpentine leaf miner damage increased from 4,385 hectares in 2011, to 8,300 hectares in 2012. Affected stands were scattered throughout the Shuswap, Monashee Mountains, and Fly Hills areas. Forest tent caterpillar defoliated 452 hectares of mixed aspen - cottonwood - birch forest along the west side of Seymour Arm. Little permanent damage was seen as this was the first year of defoliation at this location. Population levels of birch leaf miner remained relatively low, with defoliation being limited to 624 hectares, scattered in small patches in the Monashees and Fly Hills. Other minor deciduous defoliators included 42 hectares of satin moth, and 20 hectares of cottonwood leaf rust. Foliar Diseases Most larch needle blight damage was seen in plantation-aged western larch, rather than in mature stands, and was scattered across the Cherryville, Trinity Valley, and Shuswap areas. Many of these stands also showed symptoms of larch needle cast (Meria laricis). One small area of damage in semi-mature larch was detected near Penticton Creek. Dothistroma needle blight infections persisted in a few lodgepole pine plantations near Monashee Creek and Cherry Creek. In total 70 hectares were affected. Ministry of Forests, Lands and Natural Resource Operations, Kamloops, B.C. 26 Forest tent caterpillar near Seymour Arm, Okanagan TSA. A mix of larch needle blight and larch needle cast affecting a larch plantation near Lee Creek, in the Okanagan TSA.
A Douglas-fir Drought-Decline Complex During the aerial surveys, tree mortality of an unknown cause was detected along the west side of Sugar Lake. Four individual polygons covering 289 hectares were mapped. Followup ground assessments found a combination of Douglas-fir beetle and Armillaria root disease, although drought was likely the catalyst, as not all trees had a biotic causal agent associated with mortality. The soils in this area are very coarse, and therefore very sensitive to any water deficits. The stands examined were mature even-aged Douglasfir with a minor component of western larch, western red cedar and western hemlock. Douglas-fir and western larch were the most prone to mortality. Most species, with the exception of western red cedar, have experienced poor growth over the last several years as exhibited by the crown symptoms. It is likely that both Douglas-fir beetle and Armillaria are responding to host stress; these symptoms may be indicative of changing climatic effects on dry transitional sites. A hillside above Sugar Lake showing symptoms of drought/decline, root disease, and Douglas-fir beetle. Similar but less extensive symptoms have been observed in the Kootenays for the last few years, most obviously near Trout Lake, where Douglas-fir on dry to mesic sites within the Interior Cedar-Hemlock zone have displayed thin crowns, dying tops, and scattered mortality. These symptoms have not been detectable from the air but have been observed during other ground survey work. Several other minor damaging agents were detected during the aerial surveys. These included 20 hectares of cottonwood leaf rust, 24 hectares of armillaria root disease, 17 hectares of bear damage, 125 hectares of birch decline (near Falkland), 82 hectares of aspen decline (near Crater Mountain), 500 hectares of wildfire, 70 hectares of windthrow, 24 hectares of flooding, and two landslides that damaged 10 hectares of mature timber. Ministry of Forests, Lands and Natural Resource Operations, Kamloops, B.C. 27 Flooding damage in the Larch Hills area of the Okanagan TSA.
Page 1 and 2: 2012 Overview of Forest Health Cond
Page 3 and 4: In t r o d u c t I o n This report
Page 5 and 6: Table 2 continued. Area summaries f
Page 7 and 8: So u t h e r n In t e r I o r ov e
Page 9 and 10: Attack in young lodgepole pine stan
Page 11 and 12: A total of 116,012 hectares of high
Page 13 and 14: we S t e r n he M l o c k lo o P e
Page 15 and 16: BI r c h le a f MI n e r, fe n u s
Page 17 and 18: th o M P S o n ok a n a g a n re g
Page 19 and 20: Aspen decline syndrome became more
Page 21 and 22: Defoliators Western spruce budworm
Page 23 and 24: Defoliators Western spruce budworm
Page 25: Conifer Defoliators Western spruce
Page 29 and 30: Bo u n d a rY tSa Bark Beetles Moun
Page 31 and 32: cr a n B r o o k tSa Bark Beetles M
Page 33 and 34: go l d e n tSa Bark Beetles Mountai
Page 35 and 36: ca r I B o o re g I o n Su M M a r
Page 37 and 38: Douglas-fir beetle continued to be
Page 39 and 40: Defoliators As expected, western sp
Page 41 and 42: Thompson Okanagan Region The Thomps
Page 43 and 44: Table 2. List of western spruce bud
Page 45 and 46: Hiller spraying B.t.k. on budworm b
Page 47 and 48: Kootenay Boundary Region A total of
Page 49 and 50: Abbott’s corrected mortality comp
Page 51 and 52: Figure 5. Density and distribution
Page 53 and 54: 2012 Population Monitoring - Result
Page 55 and 56: Above: Lucy Stad receiving budworm
Page 57 and 58: One of the cancelled spray areas in
Page 59 and 60: In the Thompson-Okanagan Region, we
Page 61 and 62: Figure 9. Average number of western
Page 63 and 64: There is an ongoing study to calibr
Page 65 and 66: Larval density ± SEa b Percent mor
Page 67 and 68: Table 19. Total number of larvae pe
Page 69 and 70: Table 21. Average number of Douglas
Page 71 and 72: This stand has records of defoliati
Page 73 and 74: References Garbutt, R. 1992. Wester
Page 75 and 76: Be a r IM Pa c t S o n gr o w t h o
Page 77 and 78:
To better understand the progressio
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