Chalcogran
The six-spined spruce bark beetle, Pityogenes chalcographus (in Germany called Kupferstecher), is a serious pest in Europe of Norway spruce (Picea abies), especially the younger trees. Both sexes of these tiny beetles (2 mm long) aggregate on host trees in response to a pheromone. [1] Chalcogran, 2-ethyl-1,6-dioxaspiro[4.4]nonane, is a principal component of the aggregation pheromone […]
