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Effects of larval host diameter on body size, adult density, and parasitism of cerambycid beetles

Published online by Cambridge University Press:  04 May 2012

Peter F. Reagel ,
Michael T. Smith  and
Lawrence M. Hanks
Peter F. Reagel
Affiliation:
Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States of America
Michael T. Smith
Affiliation:
USDA-ARS Beneficial Insects Introduction Research Lab, Newark, Delaware 19713, United States of America
Lawrence M. Hanks*
Affiliation:
Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States of America
*
Corresponding author (e-mail: hanks@life.illinois.edu).
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Abstract

In this study, we assessed the relationship between the size of bolts cut from pin oak trees, Quercus palustris Münchhausen (Fagaceae), and eastern white pines, Pinus strobus Linnaeus (Pinaceae), and the number and body size of cerambycid beetles (Coleoptera: Cerambycidae) that develop within them. From oak bolts emerged adult Graphisurus fasciatus (De Geer) (98% of beetles) and Xylotrechus colonus (Fabricius), while pine bolts produced Monochamus carolinensis (Olivier) (95%) and Astylopsis sexguttata (Say). The number of G. fasciatus was positively correlated with the diameter of the oak bolts, while the greatest number of M. carolinensis emerged from pine bolts of intermediate diameter. Body size of both species was positively correlated with bolt diameter. Rates of parasitism were very low, only 0.9% for oaks, and averaging 5.3 ± 8.6% across pine bolts. Oak bolts yielded the braconid wasps (Hymenoptera: Braconidae) Wroughtonia ferruginea (Brues) and a species in the genus Atanycolus Förster (similar to Atanycoluscharus (Riley)), and an ichneumonid (Hymenoptera: Ichneumonidae) in the genus Demopheles Förster. Pine bolts produced a braconid in the genus Digonogastra Viereck, and the tachinid fly (Diptera: Tachinidae) Billaea monohammi (Townsend).

Résumé

Nous évaluons dans notre étude la relation entre la taille des billes provenant de chênes des marais, Quercus palustris Münchhausen (Fagaceae), et de pins blancs, Pinus strobus Linnaeus (Pinaceae), et le nombre et la taille corporelle des coléoptères cérambycidés (Coleoptera: Cerambycidae) qui s'y développent. Des billes de chêne, émergent des adultes de Graphisurus fasciatus (De Geer) (98% des coléoptères) et Xylotrechus colonus (Fabricius), alors que les billes de pin libèrent des Monochamus carolinensis (Olivier) (95%) et Astylopsis sexguttata (Say). Il y a une corrélation positive entre le nombre de G. fasciatus et le diamètre des billes de chêne, alors que le plus grand nombre des M. carolinensis émerge des billes de pin de diamètre intermédiaire. Il y a une corrélation positive entre la taille corporelle des deux espèces et le diamètre de la bille. Les taux de parasitisme sont très faibles, seulement 0.9% chez les chênes et en moyenne 5.3 ± 8.6% dans l'ensemble des billes de pin. Les billes de chêne ont donné les bracons (Hymenoptera: Braconidae) Wroughtonia ferruginea (Brues) et une espèce du genre Atanycolus Förster (semblable à Atanycolus charus (Riley)), ainsi qu'un ichneumon (Hymenoptera: Ichneumonidae) du genre Demopheles Förster. Les billes de pin ont généré un bracon du genre Digonogastra Viereck et la mouche tachinide (Diptera: Tachinidae) Billaea monohammi (Townsend).

Type
Original Article
Information
The Canadian Entomologist , Volume 144 , Issue 3 , 28 May 2012 , pp. 435 - 438
Copyright
Copyright © Entomological Society of Canada 2012

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