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THE BIOLOGIES OF PSEUDOHYLESINUS TSUGAE AND P. GRANDIS (COLEOPTERA: SCOLYTIDAE) IN WESTERN HEMLOCK

Published online by Cambridge University Press:  31 May 2012

J. H. McGhehey  and
W. P. Nagel
J. H. McGhehey
Affiliation:
Department of Entomology, Oregon State University, Corvallis
W. P. Nagel
Affiliation:
Department of Entomology, Oregon State University, Corvallis
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Abstract

The life histories of Pseudohylesinus tsugae Swaine and P. grandis Swaine were investigated in young coastal stands of western hemlock. Both P. tsugae and P. grandis had one generation a year with two broods and four larval instars. P. grandis usually overwintered as a teneral adult and P. tsugae as a fourth instar larva. Within thinned stands P. tsugae preferred fresh stumps for breeding material, whereas P. grandis preferred fresh slash. The adult females of both species fed in the inner-bark region of standing, live host trees before initiating egg galleries in slash or stumps.

Type
Articles
Information
The Canadian Entomologist , Volume 101 , Issue 3 , March 1969 , pp. 269 - 279
Copyright
Copyright © Entomological Society of Canada 1969

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