Electroantennogram responses of the stable fly, Stomoxys calcitrans, to components of host odour
Schofield, S. | Cork, A. | Brady, J.
Electroantennograms (EAGs) were recorded from laboratory-reared male and female Stomoxys calcitrans (L.) in response to a range of synthetic chemicals known to be electrophysiologically-active for other biting flies. Of the eight compounds initially tested, only two--1-octen-3-ol and 3-methylphenol--consistently elicited larger electroantennograms (EAGs) than did control treatments; 1-octen-3-ol was the most potent. EAG recovery time was inversely correlated with EAG amplitude. EAGs recorded with primary C2-C12 carbon chain-length primary aliphatic alcohols peaked at octan-1-ol with pentan-1-ol, hexan-1-ol and heptan-1-ol also eliciting EAG responses significantly larger than the controls. When different C8 carbon chain compounds and nonane were tested: 1-octen-3-ol elicited the largest EAGs followed by, in decreasing activity, octan-1-ol, 1-bromooctane, octan-3-ol, octanal, 2-octanone, octanoic acid and nonane. The EAG response of 1-octen-3-ol increased sigmoidally with dose, with the threshold at between 2 and 20 ng, and the peak response at 200 micrograms on filter paper. EAGs larger than control were also elicited by entrained ox odour and ox breath. The behavioural implications are discussed.
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