Table 1: Background information on bark samples of nonhost deciduous trees, Sweden.

Samples Location Date Time No. of treesTree dimension Dry weight or sampling areaTemperature
Scientific nameCommon nameHeight (m)DBH (cm)(inside/outside) °C

Bark extractions of the key species
 B. pendula RothSilver BirchAsa, Småland1998-06-1115:00–15:10210–1310–140.16–0.20 g
 B. pubescens Ehrh.Downy BirchAsa, Småland1998-06-1115:35–15:50312–2010–180.13–0.26 g
 P. tremula L.AspenAsa, Småland1998-06-1115:10–15:2538.5–9.08–100.13–0.20 g
Bark extractions of additional birch species
 B. albosinensis var. septentrionalis Schneid.Northern Chinese red birchAlnarp, Skåne2/24/199910:00–10:2029–128–12
 B. ermaniiCham.Erman’s birchAlnarp, Skåne2/24/199910:21–10:4028–108–11NA
 B. jacquemontii SpachWhite barked Himalayan BirchAlnarp, Skåne2/24/199910:41–10:5528–147–12NA
 B. maximowicziana RegelMonarch BirchAlnarp, Skåne2/24/199911:10–10:25215–2015–22NA
Aerations of fresh bark chips
 B. pendula RothSilver BirchAsa, Småland1998-06-099:30–10:00413–1614–16147–152 g21.9–22.7/21–21.7
 B. pubescens Ehrh.Downy BirchAsa, Småland1998-06-0817:00–17:30415–2024–30140–210 g22.8–23.4/22.5–23
 P. tremula L.AspenAsa, Småland1998-06-099:30–10:00412–1711–20106–194 g21.9–22.7/21–21.7
Aerations of undamaged stems
 B. pendula RothSilver BirchAsa, Småland1998-06-2912:50–14:20215–2018–200.22–0.24 m217.5–31.4/15.5–21.3
 B. pubescens Ehrh.Downy BirchAsa, Småland1998-06-2913:55–15:25215–2012–200.11–0.16 m219.5–20.0/18.3–19.2
 P. tremula L.AspenAsa, Småland1998-06-2912:15–13:45213–1514–180.18–0.22 m217.5–31.4/15.5–21.3

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