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PITYOPHTHORUS ORARIUS BRIGHT (COLEOPTERA: SCOLYTIDAE) IN A NORTHERN CALIFORNIA DOUGLAS-FIR SEED ORCHARD: EFFECT OF CLONE, TREE VIGOR, AND CONE CROP ON RATE OF ATTACK

Published online by Cambridge University Press:  31 May 2012

Nancy G. Rappaport  and
David L. Wood
Nancy G. Rappaport
Affiliation:
USDA Forest Service, Pacific Southwest Research Station, Berkeley, California, USA 94701
David L. Wood
Affiliation:
Department of Environmental Science, Policy and Management, University of California, Berkeley, California, USA 94720
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Abstract

The geographic range of the Douglas-fir twig beetle, Pityophthorus orarius Bright, was extended beyond the original provenance of southern British Columbia to northern California. A survey of 457 Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] trees in 1985 revealed that those with heavy cone crops were more likely to be infested by twig beetles than were those with a light crop. Furthermore, attack rates differed among clones. A second survey done in 1987 confirmed the importance of clone and cone crop in attack rate. In this survey, stressed trees were attacked at a higher rate than unstressed trees. Beetle distributions appeared clumped in both surveys, possibly because of semio-chemicals or oviposition behavior.

Résumé

Le scolyte des brindilles du sapin de Douglas, Pityophthorus orarius Bright, dont la répartition géographique était limitée au sud de la Colombie Britannique, a été récolté dans le nord de la Californie. Un relevé effectué en 1985 sur 457 sapins de Douglas, Pseudotsuga menziesii (Mirb.) Franco, a révélé que le taux d’attaque des cônes d’un arbre était lié à son niveau de fructification; les plus fructifères étant attaqués par plus de scolytes que ceux produisant peu de cônes. De plus, nous avons observé une corrélation positive entre les taux d’attaques et les clones de sapins. Un second relevé exécuté en 1987 a corroboré l’influence de la souche clonale et du niveau de fructification sur le taux d’attaque, en plus d’indiqué que les arbres considérés stressés étaient plus sensibles à l’attaque du scolyte que ceux sans stress. La distribution concentrée des scolytes observée lors de ces deux relevés est peut être liée au comportement de ponte ou aux substances sémio-chimiques.

Type
Articles
Information
The Canadian Entomologist , Volume 126 , Issue 5 , October 1994 , pp. 1111 - 1118
Copyright
Copyright © Entomological Society of Canada 1994

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