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Cone entomofauna of whitebark pine and alpine larch (Pinaceae): potential impact of Leptoglossus occidentalis (Hemiptera: Coreidae) and a new record of Strobilomyia macalpinei (Diptera: Anthomyiidae)

Published online by Cambridge University Press:  31 May 2012

Laurel K. Anderton  and
Michael J. Jenkins
Laurel K. Anderton
Affiliation:
Department of Forest Resources, Utah State University, Logan, Utah, United States 84322-5215
Michael J. Jenkins*
Affiliation:
Department of Forest Resources, Utah State University, Logan, Utah, United States 84322-5215
*
1 Author to whom all correspondence should be addressed.
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Abstract

Laboratory and field feeding tests with Leptoglossus occidentalis Heidemann demonstrated that both immature and mature seed bugs can use cones and foliage of whitebark pine, Pinus albicaulis Engelmann, as a food source for 1- to 2-week periods. Damage to unprotected whitebark pine cones by seed bugs ranged from 0.3 to 2.1% of seeds per cone. Total insect damage ranged from 0.4 to 7.1% of seeds per cone. A seed chalcid, Megastigmus Dalman. sp. (Hymenoptera: Torymidae), was documented for the first time on whitebark pine and was found in 4.7% of examined seeds at one site. The larch cone fly, Strobilomyia macalpinei Michelsen, was reared from cones of alpine larch, Larix lyallii Parl., from the Bitterroot Range of Montana. This is the first record of this species in the United States and the first since its description in 1988. Ninety-four percent of a sample of alpine larch cones were damaged by cone fly larvae and 64% contained larvae or puparia.

Résumé

Des tests d’alimentation en laboratoire et en nature chez Leptoglossus occidentalis Heidemann ont démontré que les punaises des graines immatures et adultes peuvent utiliser les cônes et le feuillage du pin albicaule, Pinus albicaulis Engelmann, comme sources de nourriture pour des périodes de 1 à 2 semaines. Les dommages aux cônes de pin albicaule non protégés infligés par les punaises des graines affectent 0,3–2,1% des graines par cône. Les dommages globaux attribuables aux insectes affectent 0,4–7,1% des graines par cône. Un chalcis des graines, Megastigmus Dalman. sp. (Hymenoptera : Torymidae), a été trouvé pour la première fois sur un pin albicaule, dans 4,7% des graines examinées, à un seul site. Des adultes de la Mouche granivore du mélèze, Strobilomyia macalpinei Michelsen, ont été obtenus à partir de cônes du mélèze subalpin, Larix lyallii Parl., de la chaîne des Bitterroot au Montana. C’est la première fois que cette espèce est signalée aux États-Unis et c’est aussi la première citation de l’espèce depuis sa description en 1988. Quatre-vingt-quatorze pour cent des cônes d’un échantillon de mélèzes subalpins ont été endommagés par des larves de la Mouche des cônes et 64% des cônes contenaient des larves ou des pupariums.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 133 , Issue 3 , June 2001 , pp. 399 - 406
Copyright
Copyright © Entomological Society of Canada 2001

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