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NOTES ON THE BIOLOGY OF TETROPIUM PARVULUM (COLEOPTERA: CERAMBYCIDAE) IN ALBERTA

Published online by Cambridge University Press:  31 May 2012

A. G. Raske
A. G. Raske
Affiliation:
Northern Forest Research Centre, Canadian Forestry Service, Edmonton, Alberta
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Abstract

The wood borer Tetropium parvulum Casey is an economically important borer of white and engelmann spruce logs in Alberta. It has a 1-year life cycle. The adults emerge in early summer, the larvae mature by September, overwinter in L-shaped galleries, and pupate in the spring. The L-shaped galleries penetrate the wood to an average of 25–35 mm. Four natural mortality factors were: a suspect disease, the parasite Rhimphoctona alaskensis (Ashmead), excess heat, and woodpeckers. Of these, the suspect disease was the most evident, killing 57% of the mature larvae in one sample.

Résumé

Le Tetropium parvulum Casey est un perceur important des grumes d’Epinette blanche (Picea glauca) et d’Engelmann (P. engelmannii) en Alberta. Son cycle évolutif dure un an. Les adultes émergent au début de l’été, les larves arrivent à maturité en septembre, hivernent dans des galeries en L et la pupaison se produit au printemps. Ses galeries en L pénètrent dans te bois jusqu’à une profondeur moyenne de 25 à 35 mm. Quatre facteurs naturels de mortalité affectaient cet insecte, savoir : une maladie supposée, le parasite Rhimphoctona alaskensis (Ashmead), la chaleur excessive et les Pics. Tuant 57% des larves au dernier stade, la maladie supposée était le plus abondant de ces facteurs.

Type
Articles
Information
The Canadian Entomologist , Volume 105 , Issue 5 , May 1973 , pp. 757 - 760
Copyright
Copyright © Entomological Society of Canada 1973

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References

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