Repellency of various oils and pine oil constituents to house flies (Diptera: Muscidae)
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| Authors: | Maganga, ME; Gries, G; Gries, R |
| Year: | 1996 |
| Journal: | Environmental Entomology 25: 1182-1187 |
| Title: | Repellency of various oils and pine oil constituents to house flies (Diptera: Muscidae) |
| Abstract: | Comparative repellency of pine, mineral, motor, and silicon oil to house flies, Musca domestica L., was tested. In binary choice bioassays with flies feeding on 20 mu l of watery honey solutions mixed with (treatment) or without (control) 10 mu l of one of the oils under investigation, only pine oil completely suppressed feeding and remained inhibitory even after 24 h. Approaching pine oil-treated honey solution, 95% of flies were repelled at a distance >6 mm from the source. Analysis of pine oil volatiles by coupled gas chromatographic-electroantennographic detection (CC-EAD) analysis revealed 5 antennally active compounds, 4 of which were identified by coupled GC-mass spectrometry as myrcene, p-cymene, gamma-terpinene, and (+/-)-linalool. Treatment of honey solution with pine oil, the 4 compounds singly, or in quaternary combination at 10 mu l each, equally and significantly reduced the number of feeding flies compared with untreated honey solution. At an amount of 1 mu l, only the linalool treatment inhibited feeding. In binary choice experiments hath feeding and oviposition were significantly reduced on linalool-treated sources. Because By maggots naturally develop in and rely on microbe-rich organic sources, gravid females may perceive and avoid potential oviposition sites that are rich in antimicrobial compounds such as linalool. |
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