Electrophysiological and behavioural responses of Ips typographus (L.) to trans-4-thujanol—a host tree volatile compound

Table 1 Amount of terpenes (%, mean ± standard error) in bark of Norway spruce (Picea abies) of different age

Compound		RI^a	Age of Norway spruce (years)
Compound		RI^a	10	35-40	70-80	120
1	Tricyclene	998	0.12 ± 0.02	0.17 ± 0.04	0.36 ± 0,05	0.40 ± 0.11
2	α-Pinene	1024	27.54 ± 3.10	30.78 ± 5.04	47.79 ± 5,35	52.92 ± 4.86
3	Camphene	1049	0.71 ± 0.21	0.76 ± 0.20	2.12 ± 0,60	2.07 ± 1.09
4	β-Pinene	1102	25.62 ± 3.79	28.44 ± 5.14	28.90 ± 4,56	30.42 ± 4.28
5	Sabinene	1114	1.50 ± 0.39	1.04 ± 0.28	0.63 ± 0,17	0.55 ± 0.08
6	3-Carene	1142	16.59 ± 5.58	12.25 ± 8.70	4.23 ± 2,28	0.71 ± 0.41
7	Myrcene	1161	3.76 ± 0.36	3.95 ± 0.69	2.43 ± 0,41	2.11 ± 0.60
8	α-Terpinene	1178	0.13 ± 0.03	0.13 ± 0.03	0.22 ± 0,06	0.20 ± 0.07
9	Limonene	1191	11.80 ± 2.88	7.87 ± 2.15	4.76 ± 1,89	2.74 ± 0.49
10	β-Phellandrene	1199	9.88 ± 1.45	12.37 ± 2.35	7.02 ± 1,37	6.49 ± 1.37
11	γ-Terpinene	1239	0.26 ± 0.07	0.26 ± 0.08	0.15 ± 0,04	0.29 ± 0.10
12	p-Cymene	1261	0.05 ± 0.01	0.12 ± 0.04	0.46 ± 0,15	0.39 ± 0.19
13	Terpinolene	1275	2.04 ± 0.58	1.67 ± 0.60	0.89 ± 0,17	0.70 ± 0.15
14	trans-4-Thujanol	1465	0.13 ± 0.02	0.18 ± 0.05	0.04 ± 0,01	0.01 ± 0.01
Sample number (N)			9	5	7	5
Total amount (μg/g) of monoterpenes (1–13)^b			6514.5 ± 945.0	2766.0 ± 664.4	955.0 ± 133.0	793.0 ± 246.1

^aRI calculated from retention times relative to that of n-alkanes (C10–C33 on the polar DB-Wax column)
^bDry weight of bark

ISSN: 1297-966X