Test von Monoterpenen als Zusatz zu Pheroprax bzw. Chalcoprax in Pheromonfallen zum Fang des Buchdruckers, Ips typographus L. bzw. des Kupferstechers, Pityogenes chalcographus L. (Col., Scolytidae)

1996

S. 109-110

10 Lit. Ang.

Unselbständiges Werk

200044389

Experiments on monoterpenes in combination with Pheroprax and Chalcoprax in pheromone traps for catching the bark beetles Ips typographus L. and Pityogenes chalcographus L. (Col., Scolytidae). It is highly evident that monoterpenes of the host tree serve as olfactory stimulants for "pioneer- beetles" colonizing first a tree before any bark-beetle-produced aggregation pheromones can lure those beetles to the host. The findings of Reddemann (1993) about a significant increase of spruce engraver catches by addition of both (-)-alpha-pine and (+)-limonen simultaneously to pheroprax-baited bark beetle traps (Pheroprax being the aggregation pheromone of Ips typographus) induced us to conduct field experiments testing the same host volatiles in comparable bark beetle traps baited with either Pheroprax or Chalcoprax (aggregation pheromone of Pityogenes chalcographus). Despite we used methods considering the influence of place and time on the bark beetle flight activities, in 3 experiments with 30 repetitions in total no monoterpene-induced enhancement of typographus-catches could be found; the same was true with Pityogenes chalcographus (2 experiments, 18 repetitions in total). With respect to the important role of host volatiles also from a practical point of view, it is strongly recommended to repeat experiments like these under different conditions to reveal the reasons of the different findings.