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- W2308069866 abstract "Past infestations of the white pine weevil, Pissodes strobi Peck, were reconstructed by examining standing and felled trees in naturally regenerated interior spruce, Picea engelmannii (Parry) Engelm. x P. glauca (Moench) Voss, stands within two Sub-Boreal Spruce (SBS) biogeoclimatic subzones of the McGregor Model Forest. Naturally occurring infestations were frequent in both the SBS wet cool (SBS wk) and SBS very wet cool (SBS vk) subzones, demonstrating that weeding is not primarily a consequence of present day forest management practices. All 16 felled trees in each subzone had stem defects (scars, crooks, or forks), approximately one-third of which were verified to be caused by the weevil. In the SBS wk and SBS vk subzones, respectively, 56.3 % and 81.3 % of felled trees contained defects caused by the weevil, with approximately two such defects per tree. Trees in the SBS vk subzone had significantly more weevil attacks high on the bole than spruce trees in the SBS wk subzone. The height of first weevil attack was also significantly higher on the bole in the SBS vk than in the SBS wk subzone. Three hypotheses suggested for this observation are: 1) a lack of overstory shade in the SBS vk allowing successfbl attacks high on the stem; 2) longer spruce leaders in the SBS wk producing larger adult weevils that are capable of dispersal as stand becomes unsuitable for weevils; and 3) shorter fire return interval in the SBS wk than SBS vk, which could provide more susceptible hosts in the SBS wk subzone. I hypothesize that large-scale disturbances in interior forest ecosystems may have lead to a close coevolutionary relationship between weevil and it's tree host, leading in turn to greater selection pressure for the development of resistance to the weevil in the interior of British Columbia than in the coastal fog belt where large-scale disturbances are infrequent. The results suggest that mature trees could be surveyed to determine potential weevil problems for hture stands and thus aid in incorporating weevil management plans into silvicultural prescriptions." @default.
- W2308069866 created "2016-06-24" @default.
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- W2308069866 date "1997-01-01" @default.
- W2308069866 modified "2023-09-27" @default.
- W2308069866 title "Past infestations of the white pine weevil, Pissodes strobi Peck, (Coleoptera: Curculionidae) within naturally regenerated stands of the McGregor Model Forest, Prince George, British Columbia" @default.
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