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Deterrent and antibiosis activity in Thespesia populnea Cav. against the spotted bollworm, Earias vittella (Fabricius)

Published online by Cambridge University Press:  19 September 2011

T. K. Dongre  and
G. W. Rahalkar
T. K. Dongre
Affiliation:
Nuclear Agriculture Division, Bhabha Atomic Research Centre, Trombay, Bombay, India
G. W. Rahalkar
Affiliation:
Nuclear Agriculture Division, Bhabha Atomic Research Centre, Trombay, Bombay, India
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Abstract

Earias vittella (Fabricius) feeds on some malvaceous plant species, but has never been reported to attack Thespesia populnea Cav., even though this plant belongs to the same family. The factors responsible for the failure of E. vittella to establish on T. populnea were, therefore, studied. When whole fruits or fruit pericarps of this plant were provided as larval food, larvae failed to develop and none of them pupated. However, on developing seeds of these fruits, larval growth and development were normal and comparable to those of larvae reared on developing seeds of the most favoured host plant, Abelmoschus esculentus Moench. Ether extracts from fruit pericarps exhibited antifeedant and antibiosis activity against this insect. Ether as well as ethanol extracts affected oviposition to some extent. In a choice situation, significantly less eggs were laid on treated than on untreated okra fruits. However, in a no-choice situation most of the eggs were laid on treated okra fruits.

Résumé

L'Earias vittella (Fabricius) se nourrit de quelques plantes malvacées, mais il n'a pas encore attaqué le Thespesia populnea Cav., bien qu'il appartienna à la même famille. Nous avons done étudié les raisons pour lesquelles l'E vittella ne s'établit pas sur T. populnae. Quant des fruits ou des péricarpes de cette plante étaient données comme nourriture aux chenilles, ces chenilles n'ont pas développées et elles ne se sont pas metamorphosées en chrysalide. Cependant, quand la nourriture consistait des grains en train de développement. L'évolution des chennilles était normale, comme dans le cas des chenilles alimentées des grains développants de la plante-hôte preferée — l'Abelmoschus esculentus Moench. Un d'éther extrait des péricarpes des fruits, a montré un effet phagodissuadant et une activité antibiose contre cette insecte. Dans une certaine mesure, les extraits d'éther et de l'alcool éthylique, ont influence la ponte de cette insecte. Quand il y avait un choix, le nombre d'oeufs pondus sur les fruits de gumbo traitées était plus grand que celui sur les fruits non-traitées. Mais en absence de choix la plupart des oeufs étaient pondus sur les fruits de gumbo traintées.

Keywords

Spotted bollwormEarias vittellaThespesia populneaantifeedantoviposition deterrentantibiosisVers tachéEarias vittellaThespesia populneaeffet phagodissuadanteffet preventif de la ponteantibiose
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 13 , Issue 5 , October 1992 , pp. 673 - 677
Copyright
Copyright © ICIPE 1992

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