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The compounds 1,8-cineole and zerumbone (ZER) from the  Cyperus rotundus  rhizome along with another 11 previously identified rhizome essential oil constituents and α-humulene, which lacks the only carbonyl group present in ZER, as well as binary mixtures of ZER and seven active compounds were tested for repellency to male  B .  germanica . The results were compared to  N , N -diethyl-3-methylbenzamide (deet). In filter-paper choice tests, ZER was the most repellent compound, and α-humulene was ineffective, which indicates that the α,β-unsaturated carbonyl group of ZER is a prerequisite component for repellency. At 81.5 μg cm −2 , enhanced repellency was produced by binary mixtures of ZER and 1,8-cineole, (+)-dihydrocarvone or ( R )-(+)-limonene (70:30, 50:50 and 30:70 ratios by weight). These mixtures were very effective against male  B .  germanica  within 24 h and were more repellent than a single compound or deet alone. The optimum ZER content was determined to be more than 50%. In Ebeling choice box tests at 652.4 μg cm −2 , these compounds and deet resulted in complete repellency to intact male  B .  germanica , while they exhibited 35–47% repellency to antennectomized male one. Mixtures formulated from the active constituents of the  C .  rotundus  rhizome could be useful as potential repellents for controlling  B .  germanica .

Repellency of zerumbone identified in Cyperus rotundus rhizome and other constituents to Blattella germanica