Abstract

The characteristic stink of three pentatomid bugs was shown to be largely due to a mixture of hex-2-enal, a dicarbonyl compound, and either oct-2-enal or dec-2-enal. In two coreid bugs n-hexanal was a major odour component. These or similar compounds occur in plants on which the bugs feed, but it is possible that the bugs may also produce them metabolically. The odours almost certainly have a defensive role.

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