In agreement to published results on the present article, on experiments carried in southern Europe (Etxebeste&Pajares 2010; doi: 10.1111/j.1439-0418.2010.01531.x), T. formicarius catches were not affected by trans-conophthorin, whereas verbenone strongly inhibitted attraction to kairomones. The trogossitid, Temnoscheila coerulea, responded on a similar way.
A four times higher emission rate of Vn on the studies carried in Southern Eruope, could have influenced the recorded response, but it is interesting to find that Vn had no effect on T. formicarius when released at 0.5mg/day, specially when catch levels drop up to ca.80%. Could a threshold level of "prey's old host signal" be involved?