Canadian Forest Service Publications

Determining the instar of mountain pine beetle (Coleoptera: Curculionidae) larvae by the width of their head capsules. 2014. Bleiker, K.P.; Régnière, J. Can. Entomol. 147: 635–640.

Year: 2015

Available from: Pacific Forestry Centre

Catalog ID: 35796

Language: English

CFS Availability: PDF (download)

Available from the Journal's Web site.
DOI: 10.4039/tce.2014.63

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Abstract

Cut-points to distinguish larval instars of the mountain pine beetle (MPB), Dendroctonus ponderosae Hopkins (Coleoptera: Curculionidae), from the measurement of head-capsule width were determined using a maximum likelihood approach. The cut-points that distinguish the four instars are suitable to classify individual larvae from field populations collected from lodgepole pine Pinus contorta var. latifolia Engelmann (Pinaceae) or jack pine (P. banksiana Lambert) × lodgepole pine hybrids throughout most of the beetle’s current range in British Columbia and Alberta, Canada. The ability to designate the instar of field-collected larvae will facilitate the calibration of phenology and populations models that assess the climatic suitability of habitats and the potential for MPB to continue expanding its range.

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