Bark Beetles, Pityogenes bidentatus, Orienting to Aggregation Pheromone Avoid Conifer Monoterpene Odors When Flying but Not When Walking

Figure 2

Attraction of flying Pityogenes bidentatus to pairs of slowly-rotated traps releasing aggregation pheromone (cis-verbenol = Cv and grandisol = G1) when individual monoterpenes were released from one of the two traps. Tests were performed at different dates and times during May 2001 in Sjöbo/Veberöd, Sweden. Numbers inside light and black bars represent catch of each sex. Treatments with asterisks caught significantly fewer beetles (sexes summed) in the treatment than the control trap in the same pair (𝑃<0.01, chi-square test).