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Prevalence of four species of egg parasitoids attacking tabanid eggs in Manitoba, Canada

Published online by Cambridge University Press:  02 April 2012

Mohmood Iranpour  and
Terry D. Galloway
Mohmood Iranpour*
Affiliation:
Department of Entomology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
Terry D. Galloway
Affiliation:
Department of Entomology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
*
1Corresponding author (e-mail: [email protected]).
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Abstract

Egg masses of the horse fly, Hybomitra nitidifrons nuda (McDunnough), and the deer fly, Chrysops aestuans Wulp (Diptera: Tabanidae), were collected during the summers of 1996–2000 from five different locations in southern Manitoba. On average, hymenopterous egg parasitoids were reared from more than 90% of collected egg masses. Telenomus hybomitrae Iranpour and Galloway and (or) Telenomus utilis Iranpour and Galloway (Hymenoptera: Platygastridae: Telenominae) emerged from multilayered egg masses of H. n. nuda. However, Trichogramma semblidis (Aurivillius) (Hymenoptera: Trichogrammatidae) and (or) Telenomus chrysopsis Iranpour and Galloway were reared from single-layered egg masses of C. aestuans. In H. n. nuda egg masses, more than 33% of individual eggs were parasitized and more than an additional 35% were apparently damaged by the two telenomine parasitoids. In C. aestuans egg masses, approximately 40% of individual eggs were parasitized and 18% produced neither parasitoids nor larvae.

Résumé

Pendant les étés 1996 à 2000, nous avons récolté des masses d’oeufs de mouches à cheval Hybomitra nitidifrons nuda (McDunnough) et de mouches à chevreuil Chrysops aestuans Wulp (Diptera: Tabanidae) dans cinq sites différents du sud du Manitoba. En moyenne, nous avons obtenu en élevage des hyménoptères parasitoïdes des oeufs dans plus de 90 % des masses d’oeufs récoltées. Dans les masses d’oeufs à plusieurs couches d’H. nitidifrons nuda, ont émergé Telenomus hybomitrae Iranpour et Galloway et (ou) Telenomus utilis Iranpour et Galloway (Hymenoptera: Platygastridae: Telenominae). En revanche, dans les masses d’oeufs à une seule couche de C. aestuans, nous avons obtenu en élevage Trichogramma semblidis (Aurivillius) (Hymnenoptera: Trichogrammatidae) et (ou) Telenomus chrysopsis Iranpour et Galloway. Au sein des masses d’oeufs d’H. nitidifrons nuda, plus de 33 % des oeufs individuels étaient parasités et plus de 35 % d’oeufs additionnels étaient apparemment endommagés par les deux parasitoïdes télénominés. Dans les masses d’oeufs de C. aestuans, environ 40 % des oeufs individuels étaient parasités et 18 % ne produisaient ni parasitoïdes, ni larves.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 140 , Issue 5 , October 2008 , pp. 603 - 610
Copyright
Copyright © Entomological Society of Canada 2008

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