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ESTIMATING ATTACK AND BROOD TOTALS AND DENSITIES OF THE MOUNTAIN PINE BEETLE IN INDIVIDUAL LODGEPOLE PINE TREES

Published online by Cambridge University Press:  31 May 2012

L. Safranyik
L. Safranyik
Affiliation:
Canadian Forestry Service, Pacific Forestry Centre, 506 West Burnside Road, Victoria, British Columbia V8Z 1M5
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Abstract

A method was developed for estimating attack and brood totals of the mountain pine beetle in part or all of the infested bole of individual lodgepole pine trees. The method requires measurement of tree height, tree diameter at 1.37 m, and maximum height of attack, and tallying of brood and attacks on paired 20 cm by 30 cm samples centered at 1.22 m on the bole. Attack and brood totals are estimated in two ways: (1) as a product of the variables (a) total bole surface area, (b) proportion of bole surface area infested, and (c) mean attack/brood density; and (2) regression on the combined variables of tree diameter, infested height, and attack/brood density at 1.22 m on the bole. An approach to developing variance estimates for brood and attack totals is discussed.

Résumé

On a mis au point une méthode pour évaluer les attaques et les pontes du dendroctone du pin ponderosa dans une partie ou la totalité du fût infesté de pins lodgepoles. La méthode exige de mesurer la hauteur de l’arbre, le diamètre de l’arbre à une hauteur de 1,37 m, la hauteur maximale de l’attaque, et de faire le total des pontes et des attaques sur des échantillons jumelés de 20 cm × 30 cm prélevés à 1,22 m de hauteur sur le fût. Les attaques et les pontes sont évaluées de deux façons : (1) comme produit des variables (a) surface totale du fût, (b) proportion de la surface du fût infestée et (c) densité moyenne des attaques/pontes; et (2) régression des variables combinées du diamètre de l’arbre, de la hauteur de l’arbre infestée et de la densité des attaques/pontes à une hauteur de 1,22 m sur le fût. L’auteur examine une façon d’obtenir des estimations de variance pour l’ensemble des attaques et des pontes.

Type
Articles
Information
The Canadian Entomologist , Volume 120 , Issue 4 , April 1988 , pp. 323 - 331
Copyright
Copyright © Entomological Society of Canada 1988

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