Byers, J.A. 1993b. Avoidance of competition by spruce bark
beetles, Ips typographus and Pityogenes chalcographus.
Experiment to test for attack of Ips typographus and Pityogenes chalcographus in logs previously infested with these species
Bark beetles, Ips typographus and Pityogenes chalcographus, attracted
by synthetic or natural pheromone to Norway spruce logs, Picea abies,
preferred to colonize uninfested logs rather than logs occupied by
these beetles, probably as a means of avoiding intra- and
interspecific competition. The aggregation pheromone components of P.chalcographus, chalcogran and methyl (E, Z)-2,4-decadienoate,
inhibited the attraction response of I. typographus to its pheromone
components (methyl butenol and cis-verbenol), while the converse was
not true. However, verbenone released from colonized bark inhibited
pheromonal response of P. chalcographus.