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Gas chromatograms of volatiles (desorbed from Porapak Q) emanating from ground elm wood infected with the fungal pathogen Ophiostoma novo-ulmi. Hewlett Packard 5890A gas chromatograph with DB-5 column (30 m×0.32 mm i.d.; J&W Scientific, Folsom, CA 95630) with flame ionization (FID) or electroantennographic detector (EAD: male or female Hylurgopinus rufipes antenna); splitless injection; temperature program: 50 °C (2 min), then 10 °C min−1 to 280 °C.
