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THE ROLE OF FUNGI VECTORED BY DENDROCTONUS BREVICOMIS LECONTE (COLEOPTERA: SCOLYTIDAE) IN OCCLUSION OF PONDEROSA PINE XYLEM

Published online by Cambridge University Press:  31 May 2012

K.R. Hobson ,
J.R. Parmeter Jr.  and
D.L. Wood
K.R. Hobson
Affiliation:
Department of Entomological Sciences, University of California, Berkeley, California, USA 94720
J.R. Parmeter Jr.
Affiliation:
Department of Plant Pathology, University of Califomia, Berkeley, California, USA 94720
D.L. Wood
Affiliation:
Department of Entomological Sciences, University of California, Berkeley, California, USA 94720
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Abstract

Following attack by Dendroctonus brevicomis LeConte, ponderosa pines were periodically sampled over 7 weeks. Xylem water conduction was assessed using a dye flow technique. Fungal isolations were made from functioning and occluded xylem. Neither Ophiostoma nigrocarpum (Davids.) de Hoog or other bluestain fungi were commonly found at the interface of the occluded and functioning xylem. Instead, blue-stain fungi appear to colonize already occluded xylem, not cause xylem occlusion by direct hyphal penetration of functioning sapwood. No evidence for a mutualistic association of D. brevicomis and its vectored bluestain fungi was found.

Résumé

Des Pins à bois lourd ont été échantillonnés périodiquement durant 7 semaines après une invasion de Dendroctonus brevicomis LeConte. La conduction de l’eau du xylème a été mesurée au moyen d’une technique d’injection de colorant. Les champignons ont été isolés dans du xylème en circulation et dans des canaux de xylème bouchés. Nous n’avons trouvé aucun Ophiostoma nigrocarpum (Davids.) de Hoog, ni aucun autre champignon bleuissant à l’interface du xylème stoppé et du xylème en circulation. Il semble plutôt que les champignons bleuissants colonisent le xylème déjà stoppé et ne causent pas directement l’occlusion par pénétration des hyphes dans le xylème en circulation. Aucun indice de mutualisme entre D. brevicomis et les champignons bleuissants qu’il transmet n’a été constaté.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 126 , Issue 2 , April 1994 , pp. 277 - 282
Copyright
Copyright © Entomological Society of Canada 1994

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