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SPRUCE BUDWORM DEFOLIATION IN YOUNG BALSAM FIR: THE ‘GREEN’ TREE PHENOMENON

Published online by Cambridge University Press:  31 May 2012

Harald Piene  and
Eldon S. Eveleigh
Harald Piene
Affiliation:
Canadian Forest Service - Fredericton, PO Box 4000, Fredericton, New Brunswick, Canada E3B 5P7
Eldon S. Eveleigh
Affiliation:
Canadian Forest Service - Fredericton, PO Box 4000, Fredericton, New Brunswick, Canada E3B 5P7
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Abstract

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During a severe outbreak of spruce budworm, Choristoneura fumiferana (Clem.), some balsam fir trees, Abies balsamea (L.) Mill., remain noticeably greener than others in the same stand. We show that this ‘green’ tree phenomenon is not caused by differential defoliation in which certain trees experience consistently low defoliation pressure throughout an outbreak. Rather, these trees remain ‘green’ because of their prolific, epicormic shoot production which is consistently high during an outbreak, giving them a ‘greener’ appearance than other trees that produce lower numbers of epicormic shoots.

Résumé

Au cours des épidémies graves de la Tordeuse des bourgeons de l’épinette, Choristoneura fumiferana (Clem.), certains sapins baumiers, Abies balsamea (L.) Mill., restent beaucoup plus verts que d’autres sapins du même peuplement. Ce phénomène n’est pas causé par une défoliation différentielle par laquelle certains arbres subissent une moins grande pression de défoliation que d’autres durant une épidémie. Ces arbres demeurent plus verts surtout à cause de la production plus importante de pousses adventives durant une épidémie, ce qui les rends plus verts que les autres arbres qui produisent moins de pousses adventives.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 128 , Issue 6 , December 1996 , pp. 1101 - 1107
Copyright
Copyright © Entomological Society of Canada 1996

References

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