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APHID FECUNDITY, REPRODUCTIVE LONGEVITY, AND PARASITE DEVELOPMENT IN THE SCHIZAPHIS GRAMINUM (RONDANI)(HOMOPTERA: APHIDIDAE) – LYSIPHLEBUS TESTACEIPES (CRESSON) (HYMENOPTERA: BRACONIDAE) SYSTEM1

Published online by Cambridge University Press:  31 May 2012

T.J. Kring  and
J.B. Kring
T.J. Kring
Affiliation:
Department of Entomology, University of Arkansas, Fayetteville, Arkansas, USA72701and University of Florida, IFAS, Gulf Coast Research and Education Center, 5007 60th St. E., Bradenton, Florida, USA34203
J.B. Kring
Affiliation:
Department of Entomology, University of Arkansas, Fayetteville, Arkansas, USA72701and University of Florida, IFAS, Gulf Coast Research and Education Center, 5007 60th St. E., Bradenton, Florida, USA34203
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Abstract

The fecundity and reproductive longevity of Schizaphis graminum (Rondani) parasitized by Lysiphlebus testaceipes (Cresson) were determined in the laboratory under four temperature regimes. Daily reproduction by S. graminum declined rapidly after parasitization except at a relatively low temperature regime (12–16 °C). The mean progeny production by parasitized aphids of 2.75 ± 0.08 nymphs per parasitized adult was not significantly different than that for unparasitized aphids (2.94 ± 0.23 nymphs) during the period of time equal to the reproductive life of parasitized aphids. Reproductive longevity of parasitized aphids was longest at the lowest temperature (5.67 ± 0.25 days at 12–16 °C). No significant differences were observed in total progeny produced at different temperatures. The number of progeny within parasitized nulliparous adults (3.37 ± 0.33) as determined by dissections was not significantly different from the mean total progeny produced by parasitized aphids. Parasitization thus seems to interfere with oogenesis, but not with embryonic development or progeny deposition.

Résumé

La fécondité et longévité reproductrice du Schizaphis graminum (Rondani) parasité par le Lysiphlebus testaceipes (Cresson) ont été déterminées en laboratoire sous quatre régimes de température. La reproduction journalière par le S. graminum a rapidement décliné après avoir été parasité sauf à un régime de température relativement basse (12–16 °C), La production moyenne de progénitures par des aphides parasités, de 2,75 ± 0,08 nymphes par adulte parasité, n’était pas sensiblement différente de celle des aphides non parasités (2,94 ± 0,23 nymphes) pour une période temps égale à la longévité reproductrice des aphides parasités. La longévité reproductrice des aphides parasités était maximale à la température la plus basse (5,67 ± 0.25 jours à 12–16 °C). Cependant, on n’a pas noté de différence significative du nombre total de progénitures à différentes températures. Le nombre de progénitures d’adultes nullipares parasités (3,37 ± 0,33) tel qu’il a été déterminé par dissection n’était pas sensiblement différent du nombre total moyenne produit par des aphides parasités. Il semble donc que le fait d’être parasité interfère avec l’ovoginèse, mais pas avec le développement embryonnaire ou avec la ponte de la progéniture.

Type
Articles
Information
The Canadian Entomologist , Volume 120 , Issue 12 , December 1988 , pp. 1079 - 1083
Copyright
Copyright © Entomological Society of Canada 1988

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