A commercial vinegar product (ChinKiang) was found to be highly attractive to adult house flies, Musca domestica L. Field experiments on a Nebraska dairy demonstrated that traps baited with vinegar and brown sugar captured more house flies than those baited with other house fly attractants. Solid phase microextraction was used in the field to collect volatiles from the vinegar bait. Seven compounds were identified as, acetic acid, furfural, butanoic acid, isovaleric acid, hexanoic acid, 2-phenylethanol, and p-cresol. Electroantennograms showed that the seven vinegar components elicited significant responses from antennae of female and male house flies. Bioassays indicated that the vinegar blend of the seven volatile components were more attractive than any of the individual components. Field evaluations demonstrated that traps baited with the synthetic seven component blend caught as many flies as those baited with vinegar. This is the first detailed report of house fly attractants from vinegar. The vinegar volatile compounds identified in this study will be useful for the development of less objectionable alternatives to the fetid, manure mimicking volatiles currently used in commercial fly bait systems, especially those designed for use in indoor environments.
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Vol. 106 • No. 2