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Trathala flavoorbitalis: Parasitization and development in relation to host-stage attacked

Published online by Cambridge University Press:  19 September 2011

W. R. Manoharie Sandanayake  and
Jayanthi P. Edirisinghe
W. R. Manoharie Sandanayake
Affiliation:
Department of Zoology, University of Sri Jayewardenapura, Nugegoda, Sri Lanka
Jayanthi P. Edirisinghe*
Affiliation:
Department of Zoology, University of Peradeniya, Peradeniya, Sri Lanka
*
+ Address until October 1992: 105 Lonsdale Drive, Oakwood, Enfield, Middlesex EN2 7LS, UK.
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Abstract

Ovlposition 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.

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 nôte, 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) étaient 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.

Keywords

Trathala flavoorbitalisLeucinodes orbonalislarval instarparasitismdevelopmentS. melongenaTrathala flavoorbitalisLeucinodes orbonalisstade larvaireparasitismedéveloppementS. melongenu
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 13 , Issue 3 , June 1992 , pp. 287 - 292
Copyright
Copyright © ICIPE 1992

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References

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