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LEVELS OF SITKA SPRUCE WEEVIL, PISSODES STROBI (PECK), DAMAGE AMONG SITKA SPRUCE PROVENANCES AND FAMILIES NEAR SAYWARD, BRITISH COLUMBIA

Published online by Cambridge University Press:  31 May 2012

Rene I. Alfaro  and
Cheng C. Ying
Rene I. Alfaro
Affiliation:
Forestry Canada, Pacific Forestry Centre, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5
Cheng C. Ying
Affiliation:
British Columbia Ministry of Forests, Research Branch, Victoria, British Columbia, Canada V8W 3E7
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Abstract

Variation in tree height, number of attacks by the Sitka spruce weevil (= white pine weevil) (Pissodes strobi [Peck]), tree form, and stem defect were studied in a 15-year-old Sitka spruce (Picea sitchensis [Bong.] Carr.) provenance test near Sayward, on Vancouver Island, B.C. An aggregated spatial distribution of the attacks was found in the plantation. Average number of attacks, tree form, and total tree height varied significantly among provenances and among families within provenances in both light and severe infestation patches. The number of unattacked trees varied by provenance from 5 to 51%, but in patches of severe infestation it varied from 0 to 64%. The number of attacks per tree had a significant negative effect on tree height. However, at the same level of attack, some provenances grew significantly taller than others. Thirty, 19, and 51% of all trees were classified as having a good, medium, or poor form, respectively. Among provenances located in severe infestation patches, the percentages of trees having good form varied from 4 to 64%. The type of defect that formed after an attack (minor crook, major crook, or fork) varied by provenance. Aggregated weevil attack and genetic differences among provenances may have accounted for this variation.

Résumé

La variation de la hauteur des arbres, du nombre d’attaques par le charançon du picéa (= le charançon du pin blanc), Pissodes strobi (Peck), de la forme des arbres et des défectuosités des tiges ont été étudiés auprès d’une provenance de picéa Sitka, Picea sitchensis (Bong.) Carr., âgée de 15 ans, près de Sayward, île de Vancouver, C.B. Une distribution spatiale agrégative d’attaques a été trouvée à la plantation. Le nombre moyen d’attaques, la forme des arbres et la hauteur globale des arbres ont varié significativement parmi les provenances et parmi les familles en dedans des provenances aux talles d’infestations légères et importantes, toutes les deux. Le nombre d’arbres non-attaqués a varié selon le provenance de 5 à 51%, mais dans les talles d’infestation importante, il a varié de 0 à 64%. Le nombre d’attaques par arbre a eu un effet significatif et négatif à la hauteur des arbres. Cependant, au même niveau d’attaque, quelques provenances ont poussé significativement plus grandes que d’autres. Trente, 19 et 51% de tous les arbres ont été classés comme ayant une bonne, moyenne ou mauvaise forme, respectivement. Parmi les provenances sises dans les talles d’infestations importantes, les pourcentages d’arbres ayant une bonne forme ont varié de 4 à 64%. Le genre de défectuosité qui a formé après une attaque (courbure mineure, courbure majeure, ou fourche) a varié selon la provenance. Les attaques agrégatives des charançons et les différences parmi les provenances auraient pu occasionner cette variation.

Type
Articles
Information
The Canadian Entomologist , Volume 122 , Issue 4 , August 1990 , pp. 607 - 615
Copyright
Copyright © Entomological Society of Canada 1990

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