Abstract
The chemical composition of the defensive fluid secreted by adult Elasmopoda valga (Hemiptera: Coreidae) was determined by gas chromatography-mass spectrometry using a thick film glass capillary column. The secretion collected from individual insects was found to contain the aldehydes, ethanal, butanal, hexanal and (E)-2- hexenal , the carboxylic acids, ethanoic acid, butanoic acid and hexanoic acid, the alcohols, butanol and hexanol, the esters, butyl ethanoate, hexyl ethanoate, octyl ethanoate, butyl butanoate, hexyl butanoate and hexyl hexanoate, i.e. only straight-chain compounds, as well as traces of water in varying proportions. The detection and quantitative determination of these compounds in the secretion are described and their function discussed.
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