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BIONOMICS OF STRAWBERRY ROOT WEEVIL ADULTS, OTIORHYNCHUS OVATUS (L.)(COLEOPTERA: CURCULIONIDAE), ON YOUNG ORNAMENTAL CONIFER TREES IN SOUTHERN ONTARIO

Published online by Cambridge University Press:  31 May 2012

J.P. Brandt ,
S.M. Smith  and
M. Hubbes
J.P. Brandt
Affiliation:
Canadian Forest Service, Northwest Region, 5320 - 122 Street, Edmonton, Alberta, Canada T6H 3S5
S.M. Smith
Affiliation:
Faculty of Forestry, University of Toronto, Earth Sciences Centre, 33 Willcocks Street, Toronto, Ontario, Canada M5S 3B3
M. Hubbes
Affiliation:
Faculty of Forestry, University of Toronto, Earth Sciences Centre, 33 Willcocks Street, Toronto, Ontario, Canada M5S 3B3
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Abstract

Field and laboratory studies were undertaken in southern Ontario to gain bionomical information on the adult strawberry root weevil (Otiorhynchus ovatus), a pest of ornamental conifer trees in nurseries. Emergence of overwintering adults began on 3 June 1991 and lasted 56 days, with 50% emerging within 18 days. Adults dispersed less than 5 m in 48 days from a single release point. About 50% of females were fecund. The laboratory temperatures at which adults were reared (15, 20, and 25°C) had no significant effect on fecundity (62.3 eggs per female) but influenced longevity; adults at 15°C lived longer than at 20 or 25°C. The mean preovipositional and ovipositional periods were 31.5 and 49.0 days, respectively. Less than 1% of adult weevils released in the field survived the winter; overwintering adults lived 10 months. Egg eclosion occurred 16 days after oviposition with 78% of the eggs viable. The significance of these biological observations in the development of management strategies for this pest is discussed.

Résumé

Des recherches en nature et en laboratoire ont été entreprises dans le sud de l’Ontario dans le but d’étudier la biologie du Charançon de la racine du fraisier (Otiorhynchus ovatus), un insecte qui infeste les conifères ornementaux dans les pépinières. L’émergence des adultes qui ont survécu à l’hiver a commencé le 3 juin 1991 et a duré 56 jours, mais 50% des individus étaient déjà sortis après 18 jours. Les adultes se sont déplacés de moins de 5 m en 48 jours à partir d’un point de libération unique. Environ 50% des femelles étaient fécondes. Les températures utilisées en laboratoire pour l’élevage des adultes (15, 20 et 25°C) n’avaient pas d’influence particulière sur la fécondité (62,3 oeufs par femelle), mais influençaient la longévité; les adultes élevés à 15°C ont vécu plus longtemps que ceux élevés à 20 ou 25°C. La durée moyenne de la période de préponte a été évaluée à 31,5 jours, celle de la ponte à 49,0 jours. Moins de 1% des charançons adultes libérés en nature ont survécu à l’hiver et leur longévité a été estimée à 10 mois. L’éclosion s’est produite 16 jours après la ponte et 78% des oeufs étaient viables. L’importance de ces observations dans l’élaboration de stratégies d’aménagement fait l’objet d’une discussion.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 127 , Issue 4 , August 1995 , pp. 595 - 604
Copyright
Copyright © Entomological Society of Canada 1995

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