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Zur Wirtsfindung von Trypodendron domesticum und Trypodendron lineatum (Coleoptera: Scolytidae)



Zur Wirtsfindung von Trypodendron domesticum und Trypodendron lineatum (Coleoptera: Scolytidae)



Zeitschrift fuer Angewandte Zoologie 732: 159-197



In the field experiments under consideration some traps (perspex tube traps and sticky traps) and billets of beech and spruce respectively remained unbaitted, other traps and billets were supplied with lineatin or ethanol alone or with a combination of these attractions. There were also traps at hand in which ethanol was replaced by extracts in ethanol derived from beech bark or spruce bark. The trap catches showed the following facts: 1. Among the two species of Trypodendron the mechanisms of orientation towards beetle-derived and host tree-derived attractants were different. In order to achieve attactiveness for T. domesticum, the chemical stimuli "lineatin", "ethanol" or "bark extracts in ethanol" had to be combined with optimal stimuli. Of greater importance for the orientation of T. lineatum was the existence of a bouquet of odour as complete as possible consisting of beetle-derived and host tree-derived attractants. Due to the strong synergism between the optical stimulus "tree trunk silhouette" and the chemical stimulus "lineatin" false approach flights to non-host trees probably occur more frequently among the beetles of T. domesticum. 2. The two sexes of T. domesticum and T. lineatum showed differences in the intensity of reactions towards lineatin and towards ethanol or bark extracts in ethanol respectively. The males of the two species responded to lineatin more strongly than the females, and again this fact was more clearly marked among the beetles of T. domesticum than among those of T. lineatum. Lineatin largely had the character of a sexual pheromone. 3. The dispersal behaviour of the two species of Trypodendron was different. This was shown by the fact that T. domesticum was caught in experimental areas situated in both the broadleaf wood and the coniferous wood. On the contrary T. lineatum was caught only in the coniferous wood.

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