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Bionomics of an aphidiid parasitoid, Trioxys indicus Subba Rao and Sharma. 35. Influence of food plants on the life table statistics of the parasitoid through its host Aphis gossypii Glover

Published online by Cambridge University Press:  19 September 2011

Neelima Bhatt  and
Rajendra Singh
Neelima Bhatt
Affiliation:
Aphid-Biocontrol Laboratory, Department of Zoology, University of Gorakhpur, Gorakhpur-273 009, India
Rajendra Singh
Affiliation:
Aphid-Biocontrol Laboratory, Department of Zoology, University of Gorakhpur, Gorakhpur-273 009, India
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Abstract

In the present work, influence of food plants on different life table parameters of the parasitoid Trioxys indicus Subba Rao and Sharma was studied as affected through its host Aphis gossypii Glover. Age-specific survival of T. indicus on aphids bred on Lagenaria vulgaris was greater (7 days) than on Luff a cylindrica and Cucurbita maxima (4 days). The net fecundity rate, total reproductive period, intrinsic rate of natural increase, intrinsic rate of total fecundity and weekly multiplication rate of T. indicus fed on L. vulgaris was higher than on other cucurbit food plants. Doubling time of the parasitoid fed on L. vulgaris was lower than on other food plants, whereas the mean generation time of the parasitoid on L. vulgaris was slightly higher than on L. cylindrica but lower than on Cajanus cajan and C. maxima. All these measurements (considered indices of fitness of the entomophages) indicated that population growth pattern of T. indicus fed on L. vulgaris is faster than those fed on other food plants.

Résumé

Ces recherches visent à étudier l'influence exercée par la plante hôte sur dlfferents paramètres entrant dans la table de vie du parasitoïde Trioxys indicus Subba Rao et Sharma en fonction du régime alimentaire de l'hôte Aphis gossypii Glover. L'âge spécifique de survie de T. indicus sur des pucerons élevés sur Lagenaria vulgaris était de 7 jours et supérieur à celui de ceux élevés sur Luffa cylindrica et Cucurbita maxima qui est de 4 jours. Le taux de fécondité net, période totale de reproduction, taux spécifique de croissance naturelle, taux spécifique de fécondité totale et le taux de multiplication hebdomadaire de T. indicus nourri sur L. vulgaris était plus élevé que sur d'autres curcubitacées hôtes. Le laps de temps que le parasitoïde nourri sur L.vulgaris met pour doubler en population était Inférleur à celui observé quand nourri sur d'autres plantes hôtes tandis que le temps moyen de développement d'une génération du parasitoïde sur L. vulgaris était légèrement plus élevé que celui observé avec L. cylindrica mais plus bas que celui noté avec Cajanus cajan et C. maxima. Toutes ces mesures (considérées comme indices de correlation des entomophages) montrent que la population de T. indicus sur L. vulgaris suit une courbe de croissance plus rapide que celle obtenue sur d'autres plantes hôotes.

Keywords

Trioxys indicusfood plantlife tableparasitoidaphidAphis gossypiiLagenaria vulgarisLuffa cylindricaCucurbita maximaCajanus cajanbiological controlTrioxys indicusplante hôtetable de vieparasitoïdepuceronAphis gossypiiLagenaria vulgarisLuffa cylindricaCurcubita maximaCajanus cajanlutte biologique
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 12 , Issue 4 , August 1991 , pp. 385 - 389
Copyright
Copyright © ICIPE 1991

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