Role of genetic resistance in managing ecosystems susceptible to white pine weevil

Alfaro, René I.

doi:10.5558/tfc72374-4

Cited by 13 publications

(8 citation statements)

References 12 publications

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“…However, even on external examination, the record held by trees many years after attack provides irrefutable evidence that the white pine weevil has been a prevalent natural component of these sub-boreal forest ecosystems that predated human intervention. This conclusion is consistent with the findings of Alfaro (1996) in fire-regenerated stands near Williams Lake, more than 200 km south of our study sites, and is supported by the evidence in Table 3 The lower height of the first weevil attack on spruce boles in the SBSwk than in the SBSvk suggests that weevils may initiate attacks on younger or smaller spruce trees in the SBSwk than in the SBSvk. Because wood volume is greatest near the base, the quantity of defect-free timber obtained from stands in the SBSwk may thus be less than from SBSvk.…”

Section: Discussionsupporting

confidence: 92%

Past infestations of the white pine weevil in naturally regenerated spruce stands

Kimoto¹,

Borden²,

Alfaro³

2000

The Forestry Chronicle

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.M. ~i r n o t o l~~, Rene I. ~l f a r o~ and John H. ~o r d e n l Past infestations of the white pine weevil, Pissodes strobi (Peck), were reconstructed by examining standing and felled trees in naturally regenerated interior spruce stands in the McGregor Model Forest in northern B.C. Infestations were common in both the SubBoreal Spruce (SBS), wet cool (SBSwk) and very wet cool (SBSvk) biogeoclimatic subzones, demonstrating that frequent weeviling is a natural event that predates human intervention. Approximately one-third of all stem defects in 32 felled trees were verified as caused by the weevil. In the SBSwk and SBSvk 56.3% and 81.3% of felled trees contained weevil-caused defects, with 1.9 and 2.1 defects per tree, respectively. Trees in the SBSvk had significantly more weevil attacks high on the bole than trees in the SBSwk.Key words: white pine weevil, Pissodes strobi, white spruce, Engelmann spruce, Picea engelmannii x P. glauca Les CpidCmies antkrieures du charangon du pin blanc, Pissodes strobi (Peck), ont Ct C reconstitukes par l'examen des arbres debout et abattus dans les peuplements de 1'intCrieur rkgknkrCs naturellement d'kpinettes dans la For2t modkle de McGregor. Les Cpidkmies ont Ct C retrouvCes tant dans les sous-zones biogCoclimatiques de 1'6pinette sub-borCale (SBS), que pour les sous-zones fraiches et humides (SBSwk) et fraiches et trks humides (SBSvk), illustrant que les CpidCmies frCquentes de charangon constituent un CvCnement nature1 qui date d'avant l'intervention humaine. Prks du tiers de toutes les tiges dCfectueuses des 32 arbres abattus ont Ctk identifikes cornme ayant Ct C attaquCes par le charangon. Dans les sous-zones SBSwk et SBSvk, 56,3 % et 81,3 % des arbres abattus contenaient des dCfauts provoquCs par le charangon, atteignant pour chaque sous-zone, 1,9 et 2,l dCfauts par arbre. Les arbres de la sous-zone SBSvk ont connu significativement plus d'attaques du charangon haut sur la tige que dans le cas des arbres de la sous-zone SBSwk.Mots-~16s: charangon du pin blanc, Pissodes strobi, Cpinette blanche, Cpinette d'Engelmann, Picea engelmannii x P. glauca

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Section: Discussionsupporting

confidence: 92%

Past infestations of the white pine weevil in naturally regenerated spruce stands

Kimoto¹,

Borden²,

Alfaro³

2000

The Forestry Chronicle

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“…Long-term site productivity may also be enhanced by the presence of aspen, which takes up nutrients and retains them within the system [25,26]. The risk of attack by white pine weevil (Pissodes strobi Peck) [27,28] and risk of Armillaria root disease is lower in mixedwood than pure conifer stands [29,30].…”

Section: Introductionmentioning

confidence: 99%

Managed Mixtures of Aspen and White Spruce 21 to 25 Years after Establishment

Kabzems

Bokalo

Comeau

et al. 2015

Forests

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Intimate mixtures of trembling aspen (Populus tremuloides Michx.) and white spruce (Picea glauca (Moench) Voss) are a key feature of western Canadian boreal forests. These mixtures have the potential to produce high yields of merchantable fibre and provide numerous ecological services. Achievement of this potential has been difficult, and often expensive, to realize as a regeneration goal in managed forests. We report 21 to 25 year results of managed mixtures on two study sites where the white spruce was planted, and the density of aspen natural regeneration manipulated within five years of the stand initiation disturbance. On both sites, white spruce mortality did not increase with increasing aspen density. While height and diameter growth of white spruce declined with increasing aspen density, the effect was not entirely consistent across the two sites. Abrasion from aspen branches was the most common source of damage to spruce crowns. Mixed stands had greater merchantable volume production than pure spruce stands based on model projections. Application of aspen harvest at year 60, while protecting the spruce component for a second harvest entry at year 90, was projected to optimize combined yield for the mixedwood stands.

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“…Long-term site productivity is also enhanced by the presence of aspen, which takes up large amounts of nutrients and retains them within the system (Pastor 1990). The risk of attack by white pine weevil (Pissodes strobi Peck) (Stiell and Berry 1985, Alfaro 1996, Taylor et al 1996 and, in eastern Canada, spruce budworm (Choristoneura spp.) (MacLean 1996, Su et al 1996 is lower in mixedwood than pure conifer stands.…”

Section: Introductionmentioning

confidence: 99%

Implications of selected approaches for regenerating and managing western boreal mixedwoods

Comeau

Kabzems²,

McClarnon³

et al. 2005

The Forestry Chronicle

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We describe a range of approaches for managing boreal mixedwood stands composed of trembling aspen (Populus tremuloides Michx.) and white spruce (Picea glauca (Moench) Voss) in British Columbia and Alberta. Successful management of these complex forests requires a combination of well-defined objectives at the landscape level and flexible planning at the stand level. A variety of management strategies must be applied concurrently across the landscape to ensure that the natural mix of forest types and structural diversity is maintained. Selected approaches are discussed with regard to their suitability to particular stand conditions and sets of objectives, the types of tending and harvesting activities required, expected outcomes, and costs. The three approaches discussed are: 1) creation and management of two-storied intimate mixtures; 2) creation of a single-storied mixture of aspen and white spruce; and, 3) creation of a mosaic of discrete patches of each species.Key words: boreal mixedwood management, mixedwood silvicultural systems, aspen, white spruce, planning Mots clés : aménagement des peuplements mélangés de la forêt boréale, régimes sylvicoles des peuplements mélangés, tremble, épinette blanche, planification

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Role of genetic resistance in managing ecosystems susceptible to white pine weevil

Cited by 13 publications

References 12 publications

Past infestations of the white pine weevil in naturally regenerated spruce stands

Past infestations of the white pine weevil in naturally regenerated spruce stands

Managed Mixtures of Aspen and White Spruce 21 to 25 Years after Establishment

Implications of selected approaches for regenerating and managing western boreal mixedwoods

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