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Assessment of the impact of symbiont Ophiostomatales (Fungi) on mountain pine beetle (Coleoptera: Curculionidae) performance on a jack pine (Pinaceae) diet using a novel in vitro rearing method

Published online by Cambridge University Press:  15 June 2015

Colin L. Myrholm  and
David W. Langor
Colin L. Myrholm
Affiliation:
Natural Resources Canada, Canadian Forest Service, 5320–122 St., Edmonton, Alberta, Canada T6H 3S6
David W. Langor*
Affiliation:
Natural Resources Canada, Canadian Forest Service, 5320–122 St., Edmonton, Alberta, Canada T6H 3S6
*
2Corresponding author (e-mail: dlangor@nrcan.gc.ca).
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Abstract

A novel “rearing-tube” method was developed and used to investigate the performance of mountain pine beetle (MPB), Dendroctonus ponderosae Hopkins (Coleoptera: Curculionidae: Scolytinae), with its three main ophiostomatalean fungal symbionts, Grosmannia clavigera (Robinson-Jeffrey and Davidson) Zipfel, de Beer, and Wingfield (Ophiostomataceae), Ophiostoma montium (Rumbold) von Arx (Ophiostomataceae), and Leptographium longiclavatum Lee, Kim, and Breuil (Ophiostomataceae). Transparent glass tubes filled with sterile ground jack pine (Pinus banksiana Lambert; Pinaceae) phloem and sapwood (9:1 ratio) were used to rear MPB from egg to adult with each fungus under controlled environmental conditions. Mountain pine beetle mortality was higher and development longer in fungus-free controls compared to fungal treatments. Among fungal treatments, insects developed faster, constructed shorter larval galleries, and had fewer supernumerary instars with L. longiclavatum. Insect survival was not affected by fungal treatments. Hyphal extension through the rearing medium was fastest for L. longiclavatum. Phloem nitrogen was reduced significantly by the presence of L. longiclavatum. Results support the hypothesis that ophiostomatalean symbionts provide benefits to MPB. The rearing-tube method is useful to tease apart confounding interspecific interactions between bark beetles and symbiotic fungus species.

Type
Behaviour & Ecology
Information
The Canadian Entomologist , Volume 148 , Issue 1 , February 2016 , pp. 68 - 82
Copyright
© Her Majesty the Queen in Right of Canada, as represented by Natural Resources Canada 2015 

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Footnotes

Subject editor: Rob Johns

1

Shared primary authorship

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