Pathogenicity of Leptographium longiclavatum associated with Dendroctonus ponderosae to Pinus contorta

Sangwon Lee, Jae-Jin Kim, Colette Breuil

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

We assessed the pathogenicity of Leptographium longiclavatum sp. nov., a recently reported fungal associate of the mountain pine beetle, Dendroctonus ponderosae (Hopkins, 1902). In September 2003, 30 lodgepole pines (Pinus contorta Dougl. ex Loud, var latifolia Engelm. ex S. Wats) between 98 and 130 years old were inoculated with L. longiclavatum, the known pathogen Ophiostoma clavigerum, or an agar control. Inoculation densities consisted of 200 and 800 points/m2 in a 60 cm wide band at breast height. The inoculated trees were examined in July 2004, 9 months after inoculation. Five of six trees inoculated with L. longiclavatum at high density (800 points/m2) developed yellow crowns, while the foliage of all trees inoculated at low density (200 points/m2) remained green. Both O. clavigerum and L. longiclavatum generated significantly longer necrotic lesions in the phloem and more occlusions in the sapwood than in the agar controls. In addition, the sapwood colonized by both fungi had a reduced moisture content compared with controls. These results suggest that L. longiclavatum is pathogenic and may contribute to the mortality of mountain pine beetle infested pines.

Original languageEnglish
Pages (from-to)2864-2872
Number of pages9
JournalCanadian Journal of Forest Research
Volume36
Issue number11
DOIs
Publication statusPublished - 2006 Nov 1

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Leptographium
Dendroctonus ponderosae
Pinus contorta
pathogenicity
Brickellia
sapwood
agar
inoculation
beetle
Ophiostoma
lesions (plant)
mountain
phloem
Pinus contorta var. latifolia
lesion
foliage
tree crown
breasts
moisture content
pathogen

ASJC Scopus subject areas

  • Forestry
  • Plant Science

Cite this

Pathogenicity of Leptographium longiclavatum associated with Dendroctonus ponderosae to Pinus contorta. / Lee, Sangwon; Kim, Jae-Jin; Breuil, Colette.

In: Canadian Journal of Forest Research, Vol. 36, No. 11, 01.11.2006, p. 2864-2872.

Research output: Contribution to journalArticle

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