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Chemical cues involved in both host location and oviposition by Harmonia axyridis Pallas (Coleoptera: Coccinellidae) were investigated in laboratory and field experiments. Among the five volatiles tested in a four-arm olfactometer ((E)--farnesene, -pinene, -caryophyllene, cis-3-hexen-1-ol, and limonene), gravid H. axyridis females were significantly attracted to limonene and -caryophyllene. These two chemicals also increased H. axyridis oviposition on plants. Attraction of H. axyridis towardsdoi:10.14411/eje.2010.062 fatcat:eysit2t4m5hepnfdagrnsh76pi