Spruce bark beetle (Ips typographus L.) infestation and Norway spruce status: is there a causal relationship?

0170706 - UEK-B 20033010 CZ eng J - Journal Article
Moravec, Ivo - Cudlín, Pavel - Polák, T. - Havlíček, František
Spruce bark beetle (Ips typographus L.) infestation and Norway spruce status: is there a causal relationship?
Silva Gabreta. Roč. 8, - (2002), s. 255-264. ISSN 1211-7420
R&D Projects: GA MŠMT OK 389
Institutional research plan: CEZ:AV0Z6087904
Keywords : bark beetle infestation * crown status * Picea abies
Subject RIV: GK - Forestry

Outbreaks of the spruce bark beetle (Ips typografus L.), normally a secondary pest in Norway spruce forests, can be very rapid under favourable environmental conditions. In the Šumava National Park the spruce bark beetle has always been a significant factor damaging spruce stands that become physiologically weakened by negative effects of wind, glazed frost, snow, air pollution, etc. Forest stand edges infested by spruce bark beetle were investigated in the Morva forest district in the controlled natural Zone II in years 1999,2000 and 2001. Selected tree crown transformation features such as total defoliation, primary structure defoliation, percentage of secondary shoots, and crown structure transformation stage were determined. Trees were grouped by bark beetle invasion history, total defoliation and crown structure transformation.Trees with higher crown structure transformation, i.e. trees with more acute need of replacing the defoliated parts of asssimilatory organs, were significantly more frequently infested by eight-toothed spruce bark beetles.
Permanent Link: http://hdl.handle.net/11104/0067788