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Host–tree oviposition preference of balsam fir sawfly, Neodiprion abietis (Hymenoptera: Diprionidae), in New Brunswick, Canada

Published online by Cambridge University Press:  15 May 2013

Rob C. Johns ,
J. Fidgen  and
Don P. Ostaff
Rob C. Johns*
Affiliation:
Natural Resources Canada, Canadian Forest Service – Atlantic Forestry Centre, Fredericton, New Brunswick, Canada E3B 5P7 Population Ecology Group, Faculty of Forestry and Environmental Management, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 6C2
J. Fidgen
Affiliation:
Natural Resources Canada, Canadian Forest Service – Great Lakes Forestry Centre, Sault Ste. Marie, Ontario, Canada P6A 2E5
Don P. Ostaff
Affiliation:
Natural Resources Canada, Canadian Forest Service – Atlantic Forestry Centre, Fredericton, New Brunswick, CanadaE3B 5P7[Retired]
*
1Corresponding author (e-mail: [email protected]).
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Abstract

Laboratory experiments using field-collected females were carried out to determine the oviposition preference of the balsam fir sawfly, Neodiprion abietis (Harris) (Hymenoptera: Diprionidae) in New Brunswick, Canada. Unmated adult females given no choice among host–plant foliage laid ∼98% of available eggs on balsam fir (Abies balsamea (Linnaeus) Miller; Pinaceae), but only 8% and 10%, respectively, on white spruce (Picea glauca (Moench) Voss; Pinaceae) and black spruce (Picea mariana (Miller) Britton, Sterns, and Poggenburg). Given a choice among shoots from all three hosts in the same chamber, unmated females laid all but one egg in balsam fir. Host plant had no effect on female longevity, although there were nearly four- to eightfold more empty egg slits on balsam fir needles, owing presumably to the greater activity of females on this preferred host foliage.

Résumé

Des expériences en laboratoire utilisant des femelles capturées en nature ont servi à déterminer les préférences de ponte du diprion du sapin, Neodiprion abietis (Harris) (Hymenoptera: Diprionidae), au Nouveau-Brunswick, Canada. Les femelles adultes non accouplées sans choix de feuillage de plantes hôtes ont pondu environ 98% de leurs œufs disponibles sur le sapin baumier (Abies balsamea (Linnaeus) Miller; Pinaceae), mais seulement 8% et 10% respectivement sur l’épinette blanche (Picea glauca (Moench) Voss; Pinaceae) et sur l’épinette noire (Picea mariana (Miller) Britton, Sterns et Poggenburg). En présence d'un choix de pousses des trois plantes hôtes dans la même enceinte, les femelles non accouplées ont pondu tous leurs œufs sauf un sur le sapin baumier. La plante hôte est sans effet sur la longévité de la femelle, bien qu'il y ait 4 à 8 fois plus de fentes de ponte vides sur les aiguilles du sapin baumier, ce qui s'explique sans doute par l'activité plus grande des femelles sur ce feuillage hôte préféré.

Type
Behaviour & Ecology – NOTE
Information
The Canadian Entomologist , Volume 145 , Issue 4 , August 2013 , pp. 430 - 434
Copyright
Copyright © Entomological Society of Canada 2013 

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