Fig. 1

Flame-ionization (FID) and electroantennogram detector (EAD) recordings of antennal responses of Ips typographus males to Norway spruce bark extract. 1 Internal standard (tetradecane); 2 α-longipinene; 3 cyclosativene; 4 trans-4-thujanol; 5 ylangene; 6 copaene; 7, 8 unidentified