Metabolism of 1,8-cineole in tea tree (Melaleuca alternifolia andM. linariifolia) by pyrgo beetle (Paropsisterna tigrina).
The frass of the pyrgo beetle (Paropsisterna tigrina) feeding on commercial plantations of the terpinen-4-ol chemical variety of the Australian tea tree.Melaleuca alternifolia, was found to contain a volatile oil almost identical to the essential oil of the ingested leaf. When beetles were fed leaf containing substantial quantities of 1,8-cineole, the predominant frass metabolite as determined by MS, IR,(13)C and(1)H NMR, GC, and CoGC was (+)-2β-hydroxycineole. Both male and female adults and larvae metabolizedMelaleuca oils in similar ways.
Wollongbar Agricultural Institute, 2477, Wollongbar, NSW, Australia.
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Southwell
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Maddox
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Zalucki