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DESCRIPTION OF THE LIFE STAGES OF MACROGLENES PENETRANS (KIRBY) (HYMENOPTERA: CHALCIDOIDEA, PTEROMALIDAE), A PARASITOID OF THE WHEAT MIDGE, SITODIPLOSIS MOSELLANA (GÉHIN) (DIPTERA: CECIDOMYIIDAE)

Published online by Cambridge University Press:  31 May 2012

J.F. Doane
Affiliation:
Agriculture Canada Research Station, Saskatoon, Saskatchewan, Canada S7N 0X2
R. DeClerck-Floate
Affiliation:
Agriculture Canada Research Station, Saskatoon, Saskatchewan, Canada S7N 0X2
A.P. Arthur
Affiliation:
Agriculture Canada Research Station, Saskatoon, Saskatchewan, Canada S7N 0X2
F. Affolter
Affiliation:
C.A.B. International Institute of Biological Contro1, Chemin des Grillons 1, CH-2800 Delémont, Switzerland

Abstract

The life stages of Macroglenes penetrans (Kirby), an egg–larval parasitoid of the wheat midge, Sitodiplosis mosellana (Géhin), are described. The mean length and width, respectively, of 25 parasitoid eggs deposited in host eggs were 0.105 ± 0.008 (SD) mm and 0.041 ± 0.006 mm. Mature oocytes were 0.131 ± 0.008 mm long by 0.038 ± 0.004 mm wide, slightly larger than laid eggs.

A frequency distribution of head width (HW) indicated two larval instars during the feeding period. During development, the HW of the first instar remains almost constant at about 0.03 mm whereas body length (BL) increases from about 0.15 to about 0.3 mm. Both HW and BL increase in the second instar from about 0.15 and 0.49 to 0.34 and 1.05 mm, respectively, for mature larvae. The third instar does not feed and is characterized by hook-like "pseudomandibles" and four incurving spines on the terminal segment. The pupa is adectious exarate. Adults are about 2 mm long, shiny bluish-black, and have translucent wings. Males have prominent rust-coloured eyes; eyes of females are less prominent and fuscous.

Résumé

Les stades de développement de Macroglenes penetrans (Kirby), un parasitoïde ovolarvaire de la cécidomyie orange du blé, Sitodiplosis mosellana (Géhin), sont décrits. Les oeufs pondus dans ceux de l’hôte mesurent 0,105 ± 0,008 mm (moyenne ± écart-type, n = 25) de long et 0,041 ± 0,006 mm de large, alors que les oocytes matures sont légèrement plus grands avec respectivement 0,131 ± 0,008 mm et 0,038 ± 0,004 mm.

Pendant la période d’alimentation, la distribution des fréquences de la largeur de la tête du premier stade larvaire a une longueur constante d’environ 0,03 mm alors que la longueur de corps (BL) passe d’environ 0,15 mm à 0,3 mm en fin de croissance. Durant le deuxième stade larvaire, les deux paramètres HW et BL passent respectivement de 0,15 mm a 0,34 mm et de 0,49 mm a 1,05 mm en fin de croissance. Le troisième stade larvaire ne s’alimente pas et est caractérisé par des "pseudomandibules" unciformes et les quatre spinules incurvées du segment terminal. La nymphe est du type libre. Les adultes, d’environ 2 mm de long, sont de couleur bleu-noir métallique et possèdent des ailes translucides. Les mâles se distinguent par leur yeux proéminents de couleur rouille; les yeux des femelles sont moins proeminents et brun foncé.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1989

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