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VERTICAL GROWTH RESPONSE OF PONDEROSA PINE INFESTED BY WESTERN PINE SHOOT BORER, EUCOSMA SONOMANA KEARFOTT (LEPIDOPTERA: OLETHREUTIDAE)

Published online by Cambridge University Press:  31 May 2012

R.W. Thier  and
M.A. Marsden
R.W. Thier
Affiliation:
Forest Service, U.S. Department of Agriculture, Forest Pest Management, Boise, Idaho, USA 83702
M.A. Marsden
Affiliation:
Forest Service, U.S. Department of Agriculture, Methods Application Group, Ft. Collins, Colorado, USA 80528
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Abstract

Incidence of the western pine shoot borer, Eucosma sonomana Kearfott, and tree growth measurements from 5687 ponderosa pines, Pinus ponderosa Dougl. ex Laws., were recorded in the Calf Pen plantation Payette National Forest, ID. The percentage of trees infested by shoot borer generally increased as tree height increased.

Infestation of the tree’s leader usually resulted in reduced height growth especially where needle length was shortened in the leader. Height growth of infested leaders was less than uninfested leaders. This difference in height growth increased with the total height of the tree as measured in the previous year.

Résumé

La présence du perce-pousse occidental du pin, Eucosma sonomana Kearfott, a été enregistrée et des mesures de croissance ont été prises sur 5687 pins ponderosa, Pinus ponderosa Dougl. ex Laws., dans la plantation Calf Pen du Payette National Forest, ID. Le pourcentage d’arbres infestés par le perce-pousse a généralement augmenté au fur et à mesure que la croissance de l’arbre a augmenté.

L’infestation de la branche principale a généralement résulté en une croissance verticale réduite, particulièrement lorsque les aiguilles de la branche principale étaient courtes. La croissance verticale de branches principales infestées a été inférieure à celle de branches principales non-infestées. Cette différence au niveau de la croissance verticale a augmenté avec la hauteur totale de l’arbre telle que mesurée l’année précédente.

Type
Articles
Information
The Canadian Entomologist , Volume 122 , Issue 2 , April 1990 , pp. 343 - 347
Copyright
Copyright © Entomological Society of Canada 1990

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References

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