Response of Parasitic Wasp Cotesia glomerata L. (Hymenoptera: Braconidae) to Cabbage Plants of Two Varieties: Olfactory Spectra of Males and Females (original) (raw)

Journal of Economic Entomology

Abstract

The parasitoid Cotesia glomerata L. (Hymenoptera: Braconidae) oviposits in larvae of the large cabbage white butterfly (Pieris brassicae L.). Many parasitoids are attracted by volatile organic compounds (VOCs) emitted by the plant that the host insects feed on. The objectives of the study were to identify the VOCs in leaves of two varieties of cabbage (white cabbage, Brassica oleracea var. capitata f. alba and cauliflower, B. oleracea var. botrytis) damaged by P. brassicae caterpillars which elicit antennal responses of C. glomerata, and characterize the olfactory spectra of females and males. Leaf extracts were analyzed by using gas chromatography equipped with an electroantennographic detector (GC–EAD) and GC–mass spectrometry. In total, 32 olfactory-active compounds for C. glomerata in cauliflower and 24 in white cabbage were revealed. The females perceived more compounds than males. Hexan-1-ol, (E)-3-hexen-1-ol, (E)-2-octenal, benzylcianide, tetradecanal, and two unidentified co...

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