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Trathala Flavoorbitalis: Parasitization and Development in Relation to Host-Stage Attacked

  • W. R. Manoharie Sandanayake
  • Jayanthi P. Edirisinghe
Research Article

Abstract

Oviposition and development of the ichneumonid Trathala flavoorbitalis (Cam.) a parasitoid of the brinjal shoot and fruit borer, Leucinodes orbonalis Guen., was investigated. The parasitoid responded to a host larva by inserting its ovipositor (stinging) into the larva, whichever instar (first to fifth) it was. All the first and about 50% of the second instars that were stung and oviposited in, were mutilated and died as a result. Successful parasitization and parasitoid development up to adult emergence occurred in 53% of the third, 57% of the fourth and 41% of the fifth instar host larvae. When given a choice of instars for oviposition, the parasitoid avoided all first instar and most second instar larvae, while third to fifth instars were equally accepted. The total developmental time of the parasitoid was much the same (about 20–24 days) whichever larval instar (second to fifth) was parasitized. The parasitized host at pupation contained different developmental stages of the parasitoid, differing in this respect from most other species of larval-pupal parasitoids.

Key Words

Trathala flavoorbitalis Leucinodes orbonalis larval instar parasitism development S. melongena 

Résumé

L’oviposition et le développement de l’ichneumomd Trathala flavoorbitalis (Cam.), un parasitoïde se trouvant dans la pousse des aubergines et d’un foreur des fruits Leucinodes orbonalis ont été étudiés. Lorsqu le prasitoide s’expose à un larve hôte, il réagit en enfongant son ovipositeur piquant dans le larve quel que soit l’instar (ler à 5ème). Tous les premiers instars et a peu près la moitieé des deuxième piques ainsi et en état de ponte ont éfé mutiles et par conséquent sont morts. La parasitisation complète et le développement des parasitoides jusqu’ à l’emergence se sont produits chez 53% du 2ème 57% du 4ème et 41 % du 5ème instar des larves hôtes respectivement. Le parasitoide confronte avec le choix de l’instar pom l’oviposition a évite nous les premiers instars et la plupart des deuxièeme tandis que les autres instars (3ème à 5ème) étalent pareillement requs. La période totale du développement du parasitoide chez le hôte était plus an monins la même (20 à 24 jours) quel que soil le stade larvaire parasitise (2ème à 5ème). L’hôte parasitise se montre à la pupation les étape différentes de développement du parasitoide — un phènomene qui se différe de celui d’antres espèce de parasitoides aux larves et aux pupes.

Mots Clés

Trathala flavoorbitalis Leucinodes orbonalis stade larvaire parasitisme développement S. melongenu 

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References

  1. Beeson C. F. C. and Chatterjee S. N. (1935) On the biology of the Ichneumonidae (Hym.). Indian For. Res. 1, 151–168.Google Scholar
  2. Bradley W. G. and Burgess E. D. (1934) The biology of Cremastus flavoorbitalis (Cam.) an Ichneumonid parasite of the European corn borer. Tech. Bull. U.S. Dept. Agric. Washington, DC. No. 441.Google Scholar
  3. Chu-Joo-Tso and Shen-Hsiu (1937) A list of the known hymenopterous parasites of the European corn borer, Pyrausta nubilalis Hbn. Entomol. Pathol. 5, 136–147.Google Scholar
  4. De Bach P. (1964) Biological Control of Insect Pests and Weeds. Chapman & Hall, London.Google Scholar
  5. Naresh J. S., Malik V. S., Balan J. S. and Khokkar K. (1986) A new record of Trathala sp., a larval endoparasite attacking brinjal fruit borer, Leucinodes orbonalis Guenee. Bull. Entomol. (New Delhi) 27, 74.Google Scholar
  6. Obrycki J. J., Tauber M. J. and Tauber C. A. (1985) Perilitus coccinellae (Hymenoptera: Braconidae): parasitization and development in relation to host-stage attacked. Ann. Entomol. Soc. Am. 78, 852–854.CrossRefGoogle Scholar
  7. Sandanayake M. (1987) Biology of the brinjal shoot and pod borer, Leucinodes orbonalis (Guen.) and its larval parasitoid, Trathala flavoorbitalis (Cam.). M.Sc. thesis, University of Sri Jayewardenepura, Sri Lanka.Google Scholar
  8. Thompson W. R. (1943-1958) A Catalogue of the Parasites and Predators of Insect Pests. Commonwealth Institute of Biological Control, Ottawa, Ontario, Canada.Google Scholar

Copyright information

© ICIPE 1992

Authors and Affiliations

  • W. R. Manoharie Sandanayake
    • 1
  • Jayanthi P. Edirisinghe
    • 2
    • 3
  1. 1.Department of ZoologyUniversity of Sri JayewardenapuraNugegodaSri Lanka
  2. 2.Department of ZoologyUniversity of PeradeniyaPeradeniyaSri Lanka
  3. 3.Natural ResourcesEnergy and Science Authority of Sri LankaColombo 7Sri Lanka

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