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Differential susceptibility of parasitized and unparasitized larvae of spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae) to its nuclear polyhedrosis virus

Published online by Cambridge University Press:  19 September 2011

Ahlam A. M. Al-Fazairy ,
E. M. Hegazi ,
Hedaya H. Karam  and
Lamya M. Abo-Abd-Allah
Ahlam A. M. Al-Fazairy
Affiliation:
Faculty of Agriculture, Plant Protection Department, Entomology Division, University of Alexandria, Alexandria, Egypt
E. M. Hegazi
Affiliation:
Faculty of Agriculture, Plant Protection Department, Entomology Division, University of Alexandria, Alexandria, Egypt
Hedaya H. Karam
Affiliation:
Faculty of Agriculture, Plant Protection Department, Entomology Division, University of Alexandria, Alexandria, Egypt
Lamya M. Abo-Abd-Allah
Affiliation:
Faculty of Agriculture, Plant Protection Department, Entomology Division, University of Alexandria, Alexandria, Egypt
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Abstract

Rates of virus-induced mortality and values of the LC50 and LT50 showed that, in general, parasitism by Microptitis rufiventris Kok. increased the susceptibility of the Egyptian cotton leafworm, Spodoptera littoralis second-instar larvae to its nuclear polyhedrosis virus (SLNPV). By comparing the LC50 values, data revealed that virus-infected parasitized larvae were ca. 3.5 and 4.8 times more susceptible to SLNPV than virus-infected unparasitized ones at 8 and 12 days post-infection, respectively. Also, in virus-infected unparasitized larvae, the time required to attain a 50% mortality was significantly longer than that in virus-infected parasitized ones.

Résumé

Virus-induirés mort (%) et les valeurs de LC50 et LT50 révélé que parasitism par Microplitis rufiventris Kok. augmenta le sensible d'une feuille de coton égyptien, Spodoptera littoralis II - stade larvés au le noyau polyhedrosé virus (NPV). Les valeurs de LC50 ont révélé que virus - infectés parasitiés larvés était plus sensible 3.5 et 4.8 fois que les virus - infectés non-parasitiés larvés après 8 et 12 jours d'infection respectivement. Aussi, pour les virus - infectés non-parasitiés larvés, la valeur de LT50 était significantly longuer que les virus-infectés parasitiés larvés.

Keywords

Spodoptera littoralisMicroplitis rufiventrisnuclear polyhedrosis virussusceptibility
Type
Research Artilces
Information
International Journal of Tropical Insect Science , Volume 14 , Issue 3 , June 1993 , pp. 361 - 365
Copyright
Copyright © ICIPE 1993

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References

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