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Sirex species (Hymenoptera: Siricidae) and their parasitoids in Pinus sylvestris in eastern North America

Published online by Cambridge University Press:  02 April 2012

Stefan J. Long ,
David W. Williams  and
Anne E. Hajek
Stefan J. Long
Affiliation:
Department of Entomology, Cornell University, Ithaca, New York 14853–2601, United States of America
David W. Williams
Affiliation:
United States Department of Agriculture, Animal and Plant Health Inspection Service, Otis Laboratory, Building 1398, Otis Air National Guard Base, Massachusetts 02542, United States of America
Anne E. Hajek*
Affiliation:
Department of Entomology, Cornell University, Ithaca, New York 14853–2601, United States of America
*
1Corresponding author (e-mail: [email protected]).
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Abstract

Siricids and their parasitoids were reared from Scots pine (Pinus sylvestris L. (Pinaceae)) trees infested by Sirex noctilio F. in central New York State. Sirex noctilio accounted for 94.3% of the siricid specimens emerging, totaling 1313 specimens from six trees, with a maximum of 495 from one tree. Of the individuals emerging per tree, 20.6 ± 5.2% were female. Two native siricids, Sirex nigricornis F. and S. edwardsii Brullè, also emerged from trees but in low numbers. Three hymenopteran parasitoid species that attack siricids emerged, totaling 21.8 ± 6.4% parasitism per tree. Ibalia leucospoides ensiger Norton (Ibaliidae) was by far the most abundant parasitoid, at 20.5 ± 6.3% parasitism per tree. The percentage of female S. noctilio emerging was positively correlated with wood diameter, whereas percent parasitism by I. l. ensiger was negatively correlated with wood diameter.

Résumé

Des siricides et leurs parasitoïdes ont été élevés à partir de pin sylvestre, Pinus sylvestris L. (Pinaceae), infestés par Sirex noctilio F. collectés dans le centre de l’état de New York. Sirex noctilio représentait 94,3 % des siricides émergés de six arbres, soit un total de 1313 spécimens, avec un maximum de 495 S. noctilio pour un seul arbre. Parmi les S. noctilio émergés, 20,6 ± 5,2 % étaient des femelles. Deux siricides natifs (Sirex nigricornis F. et S. edwardsii Brullé) ont également émergé des arbres, mais toujours en petit nombre. Trois hyménoptères parasitoïdes s’attaquant aux siricides émergèrent également, pour un taux de parasitisme global de 21,8 ± 6,4 % par arbre. Ibalia leucospoides ensiger Norton (Ibaliidae) était de loin le parasitoïde le plus abondant avec un taux de parasitisme moyen par arbre de 20,5 ± 6,3 %. Le pourcentage de femelles S. noctilio émergeant était positivement corrélé avec le diamètre du bois, tandis que le taux de parasitisme par I. l. ensiger était négativement corrélé avec le diamètre du bois.

Type
Articles
Information
The Canadian Entomologist , Volume 141 , Issue 2 , April 2009 , pp. 153 - 157
Copyright
Copyright © Entomological Society of Canada 2009

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