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Abstract
Xylophagous scolytids (Ambrosia beetles) have long been known to prefer fallen or seriously weakened trees and stumps. They are attracted to this host material by ethanol produced by the fermenting phloem and sapwood. However, these insects have begun aggressively attacking living beeches in Southern Belgium, raising the issue of a possible shift towards primarity. More than 1.3 million m³ have been attacked in 2001 (Huart and Rondeux 2001). Strikingly, similar occurrences of ambrosia beetles attacking living broadleaf trees have been observed worldwide recently. A series of experiments have been carried out since December 2000 to answer a series of rather basic but essential questions: what is the beetles' phenology? Do they have two generations a year? What are the patterns of emergence for both species? How far from an outbreak focus do they represent a threat to other stands?
Parent Publication
Citation
Gaubicher, B.; De Proft, M.; Gregoire, J.-C. 2003.
Trypodendron domesticum and
Trypodendron signatum: two scolytid species involved in beech decline in Belgium. In: McManus, Michael L.; Liebhold, Andrew M., eds. Proceedings: Ecology, Survey and Management of Forest Insects; 2002 September 1-5; Krakow, Poland. Gen. Tech. Rep. NE-311. Newtown Square, PA: U.S. Dept. of Agriculture, Forest Service, Northeastern Research Station. 134-135.
