Colonization of two alien ambrosia beetles (Coleoptera, Scolytidae) on debarked spruce logs

Citation
P. Zach et al., Colonization of two alien ambrosia beetles (Coleoptera, Scolytidae) on debarked spruce logs, BIOLOGIA, 56(2), 2001, pp. 175-181
Citations number
23
Categorie Soggetti
Biology
Journal title
BIOLOGIA
ISSN journal
00063088 → ACNP
Volume
56
Issue
2
Year of publication
2001
Pages
175 - 181
Database
ISI
SICI code
0006-3088(200104)56:2<175:COTAAB>2.0.ZU;2-C
Abstract
In June 1996, Norway spruce (Picea abies) trees growing in a managed mixed forest near Cologne, Germany, were felled and debarked. Several days after felling, the examined spruce logs had attracted 21 beetle species, of which the alien ambrosia beetle Xylosandrus germanus (Coleoptera, Scolytidae) pr edominated. Another ambrosia beetle, Gnathotrichus materiarius was much les s abundant. The effect of log diameter on X. germanus densities was negligi ble both in shady and sunny areas in bole diameter ranges of 19 cm to 33 cm and 33 cm to 38 cm, respectively (P > 0.05). In contrast, X. germanus dens ity was significantly higher in the log in the shade (P < 0.001). Flight ac tivity of X. germanus showed a distinct diel pattern with a peak before daw n when the temperature exceeded 17<degrees>C.