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

Autor: T. K. Dongre, G. W. Rahalkar
Rok vydání: 1992
Předmět:
Zdroj: International Journal of Tropical Insect Science. 13:673-677
ISSN: 1742-7592
1742-7584
DOI: 10.1017/s1742758400007888
Popis: 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.
Databáze: OpenAIRE
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