The effect of parasitization by Trichogramma australicum on Helicoverpa armigera host eggs and embryos

Jarjees, E. and Merritt, D. J. (2004) The effect of parasitization by Trichogramma australicum on Helicoverpa armigera host eggs and embryos. Journal of Invertebrate Pathology, 85 1: 1-8. doi:10.1016/j.jip.2003.12.001


Author Jarjees, E.
Merritt, D. J.
Title The effect of parasitization by Trichogramma australicum on Helicoverpa armigera host eggs and embryos
Formatted title
The effect of parasitization by Trichogramma australicum on Helicoverpa armigera host eggs and embryos
Journal name Journal of Invertebrate Pathology   Check publisher's open access policy
ISSN 0022-2011
1096-0805
Publication date 2004-01-01
Sub-type Article (original research)
DOI 10.1016/j.jip.2003.12.001
Volume 85
Issue 1
Start page 1
End page 8
Total pages 8
Editor B.A. Federici
Place of publication San Diego
Publisher Academic Press
Collection year 2004
Language eng
Subject C1
270504 Invertebrate Biology
771004 Control of pests and exotic species
0608 Zoology
Abstract Histological investigations of the pathology of Helicoverpa armigera (Hiibner) eggs after attack by the egg parasitoid, Trichogramma australicum (Girault), indicate that the developing embryo is immediately killed by envenomation. Soon afterward the histological staining characteristics of parasitized host embryos change and the embryonic germ band dissociates into a mass of individual rounded cells. Hosts attacked by females sterilized by gamma-irradiation showed the same pathological effects as normally parasitized hosts, indicating that host degeneration is due to female venom rather than factors derived from the parasitoid embryo or larva. Cell death also occurred in older host embryos although tissue breakdown was delayed. These findings have allowed us to determine not just that the host dies but what happens to the cells and tissues, i.e., their physical appearance, the time course of their degeneration, and that the process is retarded in older hosts. These processes can possibly be emulated in artificial diets. (C) 2003 Elsevier Inc. All rights reserved.
Keyword Zoology
Trichogramma australicum
Helicoverpa armigera
venom
host
artificial diet
egg parasitoids
mass-rearing
Girault Hymenoptera
Age
Selection
Evanescens
Behavior
Larvae
Moth
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 13:08:25 EST