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ok a n a g a n tSa Bark Beetles The area of mountain pine beetle red attack has remained nearly unchanged from 2011 levels, at 44,091 hectares, while the number of small spot infestations has declined slightly, to 683. In general, the mountain pine beetle has subsided in the north end of the TSA but continues to move and infest stands to the south. The area of attacked mature lodgepole pine has decreased slightly, from just over 40,000 hectares in 2011 to 38,022 hectares in 2012, while attack in ponderosa pine has increased, from 3,557 hectares to 5,800 hectares. Attack intensity remained low in most stands, with only 3,710 hectares, or 8% of the total area, being classified as moderate or severe. Red attack levels continued to decline throughout the Cherryville and Aberdeen Plateau areas, due mainly to host depletion. Attack is slowly increasing in the Hydraulic Lake - Highway 33, Keremeos - Winters Creek and Ellis Creek areas. Attack is still quite widespread throughout the Trepanier Creek, Brenda Mine, Eneas Lake, Trout Creek, June Creek, Mission Creek, Chute Lake, and Penticton areas. Areas east of Penticton have extensive high hazard pine stands that are still relatively free of attack but are at high risk. Mountain pine beetle is active in the Ashnola around Trapper Lake but otherwise remains endemic in that part of the TSA. Attack in plantation-aged pine was low, with only 263 hectares of trace mortality recorded. Ponderosa pine mortality was most widespread near Garnet Valley, Summerland, Shingle Creek, Faulder, and Winfield. A total of 5,806 hectares and 139 spot infestations were mapped. Douglas-fir beetle activity increased in several areas, especially in the Mara Lake, Cherryville, Chase Creek, Ashnola River, and T.F.L. #33 areas. In addition, populations remained high in several other areas, including Shuswap Lake, Blurton Creek, Falkland, Ingram Creek, Salmon River, and Whiteman Creek. Overall area affected was up by over two-fold to 676 hectares, and an additional 329 spot infestations killed another 2,400 trees. Stands where salvage harvesting has occurred to remove dead pine are experiencing increases in Douglas-fir beetle attack on residual Douglas-fir. These residual, open fir stands are more susceptible to blowdown and thus attack by Douglas-fir beetle. Similar scenarios in the Merritt TSA have also led to stands having higher susceptibility to damage from western spruce budworm. Western balsam bark beetle populations continued to be active and widespread across many of the high elevation plateau areas in the TSA. The main infestation areas were Hunters Range, Greystokes Plateau, Winnifred Creek, Spa Hills, Lichen Mountain, Pukeashun Mountain, Tahaetkun Mountain, Whiterocks Mountain, and Pennask Mountain. Although the area affected was not large, spruce beetle populations appear to be increasing in the Easygoing Creek drainage. A total of 214 hectares of new attack were mapped. Ministry of Forests, Lands and Natural Resource Operations, Kamloops, B.C. 24 A stand near Hydraulic Lake experiencing an increasing level of mountain pine beetle attack, Okanagan TSA.
Conifer Defoliators Western spruce budworm populations expanded around Westwold, Oyama, and Joe Rich, resulting in an increase in the total area affected by nearly 33,000 hectares to just over 110,000 hectares. However, an aggressive spray program which treated 26,511 hectares with B.t.k. helped to limit the total area of moderate and severe defoliation to the same level as 2011, at 37,174 hectares. The heaviest defoliation was in the Westwold, Shingle Creek, Orofino Mountain, Mount Kobau, Shuttleworth Creek, and Naramata areas. Populations continued to be high in many interior wetbelt areas, with defoliation visible on scattered dry Douglas-fir ridges throughout the Mabel Lake, Sugar Lake, Cherryville, and upper Shuswap River areas. Egg mass sampling carried out in the fall indicates that budworm populations should be somewhat lower in 2013, although pockets of moderate defoliation are still expected around Westwold, Sheep Creek, Grand Oro Road, and Camp McKinney Road. A few small patches of light defoliation, totaling 186 hectares, were observed on subalpine fir near Mount Kathleen. It is unknown whether the budworm species was two-year cycle budworm, or western spruce budworm from adjacent Douglas-fir stands that had temporarily moved into subalpine fir. If this pattern persists into 2013, sampling will be done to positively identify the species. Western spruce budworm defoliation near Trepanier Creek, in the Okanagan TSA. Western hemlock looper populations reached outbreak levels in several small, discrete locations. Affected stands were detected in the upper Seymour River, Anstey Creek, Humamilt Lake, Larch Hills, Wap Creek, and Kingfisher Creek areas. Defoliation was mapped on 1,235 hectares, most of which was limited to light. Nine of the ten permanent sampling sites in the TSA were positive for larvae, although most counts were low. Adult moth catches at these sites decreased significantly from 2011, with the highest numbers at the Greenbush Lake, Kingfisher Creek, and Scotch Creek sites. Defoliation by pine needle sheath miner was again visible in lodgepole pine plantations in the Gleneden Fire, as well as in new locations at Whiteman Creek, Bear Creek, Latewhos Creek, and Trinity Valley. Total area affected was 245 hectares, most of which was moderately defoliated. Ministry of Forests, Lands and Natural Resource Operations, Kamloops, B.C. 25
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: Defoliators Western spruce budworm
Page 27 and 28: A Douglas-fir Drought-Decline Compl
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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