Crude hexane and water extracts of Catharanthus roseus Linn. (Syn: Vinca rosea) (Apocyanaceae) stem, leaf, and seed exhibited pesticidal activity against Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae). The extracts differed significantly in their efficacy, with the crude hexane extract of whole seed being the most effective in curtailing pupal survivorship to 18% followed by the hexane extracts of leaf (21%) and stem (24%). Average pupal weight (68.2 mg) and length (1.5 cm) in the whole seed treatment were drastically reduced, compared with the controls (415.2 mg and 2.72 cm), subsequently reducing adult emergence to 15.7%. SiO2 column purification yielded eight fractions of which fraction 1 exhibited 90% larval mortality, with severe reduction of the larvae weight (12.7 mg) and length (1.5 cm). Gas chromatographic-mass spectrometric analysis of fraction 1 suggested the presence of 16 compounds, among which oleic, linoleic, palmitic, and margaric acids were detected as major constituents. Presence of the alkane hydrocarbons triacontane, tetracosane, and heptacosane also was noted.
How to translate text using browser tools
1 June 2009
Growth Inhibitory Activity of Fatty Acid Methyl Esters in the Whole Seed Oil of Madagascar Periwinkle (Apocyanaceae) Against Helicoverpa armigera (Lepidoptera: Noctuidae)
R. S. Satyan,
S. Malarvannan,
P. Eganathan,
S. Rajalakshmi,
Ajay Parida
ACCESS THE FULL ARTICLE
It is not available for individual sale.
This article is only available to subscribers.
It is not available for individual sale.
It is not available for individual sale.
Journal of Economic Entomology
Vol. 102 • No. 3
June 2009
Vol. 102 • No. 3
June 2009
Catharanthus roseus
Helicoverpa armigera
oleic and linoleic acids