Hostname: page-component-78c5997874-lj6df Total loading time: 0 Render date: 2024-11-02T22:12:25.854Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Beegle, C. C. and Oatman, E. R. (1974) Differential susceptibility of parasitized and non-parasitized larvae of Trichoplusiani to a nuclear polyhedrosis virus. J. Invertebr. Pathol. 24, 188–195.CrossRefGoogle Scholar
Eller, F. J., Boucias, D. G. and Tumlinson, J. H. (1988) Interactions between Microplitis croceipes (Hymenoptera: Braconidae) and a nuclear polyhedrosis virus of Heliothis zea (Lepidoptera: Noctuidae). Environ. Entomol. 17, 977–982.CrossRefGoogle Scholar
Hafez, M., Kamel, A. A. M., Mostafa, T. H. and Omar, E. E. (1970) Field test of combination of polyhedrosis virus suspensions and certain chemical insecticides for control of the cotton leaf worm, Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae). Bull. Soc. Entomol. Egypt 4, 65–69.Google Scholar
Harpaz, I. and Raccah, B. (1978) Nucleopolyhedrosis virus (NPV) of the Egyptian cottonworm, Spodoptera littoralis (Lepidoptera: Noctuidae): Temperature and pH relations, host range and synergism. J. Invertebr. Pathol. 32, 368–372.CrossRefGoogle Scholar
Hassan, S. M. and Moawed, S. M. (1974) Toxicological studies on the effect of nuclear polyhedrosis for control of the cotton leafworm, Spodoptera littoralis (Boisd.). Symposium on the Use of Isotopes in Pesticides and Pest Control. Beirut, Lebanon, pp. 175–180.Google Scholar
Hedlund, R. C. and Yendol, W. G. (1974) Gypsy moth nuclear polyhedrosis virus production as related to inoculating time, dosage, and larval weight. J. Econ. Entomol. 67, 61–63.CrossRefGoogle Scholar
Hegazi, E. M. and El-Minshawy, A. M. (1979) Laboratory technique for mass rearing Microplitis rufiventris Kok. (Braconidae: Hymenoptera) an internal parasite of the cotton leafworm Spodoptera littoralis (Boisd.) (Noctuidae: Lepidoptera). Boll. Lab. Entomol. Agr. “F. Silvestri”, 36, 205–210.Google Scholar
Hegazi, E. M., Hammad, S. M. and El-Minshawy, A. M. (1977) Field and laboratory observations on the parasitoids of Spodoptera littoralis (Boisd.) (Lep.: Noctuidae) in Alexandria. Z. Angew. Entomol. 84, 316–327.CrossRefGoogle Scholar
Hegazi, E. M., Hammad, S. M., Altahtawy, M. M. and El-Sawaf, S. K. (1973) Parasites of the larval stage of the cotton leafworm Spodoptera littoralis (Boisd.) (Noctuidae: Lepidoptera) in Alexandria region. Z. Angew. Entomol. 74, 332–336.CrossRefGoogle Scholar
Klein, M. and Podoler, H. (1978) Studies on the application of a nuclear polyhedrosis virus to control population of the Egyptian cottonworm Spodoptera littoralis. J. Invertebr. Pathol. 32, 244–248.CrossRefGoogle Scholar
Litchfield, J. T. and Wilcoxon, F. (1949) A simplified method of evaluating dose-effect experiments. J. Pharmacol. Exp. Therap. 96, 99–133.Google ScholarPubMed
Salama, H. S., Moawed, S. M. and Zaki, F. N. (1987) Effects of nuclear polyhedrosis virus-Bacillus thuringiensis combinations on Spodoptera littoralis (Boisd.). J. Appl. Entomol. 104, 23–27.CrossRefGoogle Scholar
Tawfik, M. F. S., Hafez, M. and Ibrahim, A. A. (1977) The bionomics of Microplitis rufiventris. Bull. Soc. Entomol. Egypt 61, 123–136.Google Scholar
Teakle, R. E., Jensen, J. M. and Mulder, J. C. (1985) Susceptibility of Heliothis armigera (Lepidoptera: Noctuidae) on sorghum to nuclear polyhedrosis virus. J. Econ. Entomol. 78, 1373–1378.CrossRefGoogle Scholar
Vail, P. V., Soo Hoo, C. F., Seay, R. S., Killinen, R. G. and Wolf, W. W. (1972) Microbial control of Lepidopterous pests of fall lettuce in Arizona and effects of chemical and microbial pesticides on parasitoids. Environ. Entomol. 1, 780–785.CrossRefGoogle Scholar
Vail, P. V., Jay, D. L., Stewart, F. D., Martinez, A. J. and Dulmage, H. (1978) Comparative susceptibility of Heliothis virescens and H. tea to the nuclear polyhedrosis virus isolated from Autogrpha californica. J. Econ. Entomol. 71, 293–296.CrossRefGoogle Scholar
Verenini, M. (1983) Development of parasitiods in hosts affected by infectious diseases. Bollettino dell'Institute di Entomologia della Universita degli Studi di Bologna, 37, 225–265 (c.f. Rev. Appl. Entomol. 1984, 72, 1735).Google Scholar