2-methyl-3-buten-2-ol: A Pheromone Component of Conifer Bark Beetles Found in the Bark of Nonhost Deciduous Trees

Table 1

Background information on bark samples of nonhost deciduous trees, Sweden.

Samples		Location	Date	Time	No. of trees	Tree dimension		Dry weight or sampling area	Temperature
Scientific name	Common name					Height (m)	DBH (cm)		(inside/outside) °C
Bark extractions of the key species
B. pendula Roth	Silver Birch	Asa, Småland	1998-06-11	15:00–15:10	2	10–13	10–14	0.16–0.20 g
B. pubescens Ehrh.	Downy Birch	Asa, Småland	1998-06-11	15:35–15:50	3	12–20	10–18	0.13–0.26 g
P. tremula L.	Aspen	Asa, Småland	1998-06-11	15:10–15:25	3	8.5–9.0	8–10	0.13–0.20 g
Bark extractions of additional birch species
B. albosinensis var. septentrionalis Schneid.	Northern Chinese red birch	Alnarp, Skåne	2/24/1999	10:00–10:20	2	9–12	8–12
B. ermaniiCham.	Erman’s birch	Alnarp, Skåne	2/24/1999	10:21–10:40	2	8–10	8–11	NA
B. jacquemontii Spach	White barked Himalayan Birch	Alnarp, Skåne	2/24/1999	10:41–10:55	2	8–14	7–12	NA
B. maximowicziana Regel	Monarch Birch	Alnarp, Skåne	2/24/1999	11:10–10:25	2	15–20	15–22	NA
Aerations of fresh bark chips
B. pendula Roth	Silver Birch	Asa, Småland	1998-06-09	9:30–10:00	4	13–16	14–16	147–152 g	21.9–22.7/21–21.7
B. pubescens Ehrh.	Downy Birch	Asa, Småland	1998-06-08	17:00–17:30	4	15–20	24–30	140–210 g	22.8–23.4/22.5–23
P. tremula L.	Aspen	Asa, Småland	1998-06-09	9:30–10:00	4	12–17	11–20	106–194 g	21.9–22.7/21–21.7
Aerations of undamaged stems
B. pendula Roth	Silver Birch	Asa, Småland	1998-06-29	12:50–14:20	2	15–20	18–20	0.22–0.24 m^2	17.5–31.4/15.5–21.3
B. pubescens Ehrh.	Downy Birch	Asa, Småland	1998-06-29	13:55–15:25	2	15–20	12–20	0.11–0.16 m^2	19.5–20.0/18.3–19.2
P. tremula L.	Aspen	Asa, Småland	1998-06-29	12:15–13:45	2	13–15	14–18	0.18–0.22 m^2	17.5–31.4/15.5–21.3

fresh/dry weights were measured, and the amounts of 232 MB in the samples were not quantified.