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

Figure 3

Inhibition of P. bidentatus response by increasing release rates of a mixture of Scotch pine monoterpenes ((−)-α-pinene, (+)-α-pinene, (+)-3-carene, and terpinolene) each released in proportion to release of 1.0 Scotch pine log-equivalent (10 μg/min) in hexane with the piezoelectric sprayer from one of a pair of slowly-rotated, pheromone (cis-verbenol and grandisol)-baited traps (Veberöd, Sweden, 19 May 1999; data from [9]). Error bars represent 95% binomial confidence limits for the proportion trapped in the monoterpene-releasing trap relative to the total catches by the pair.