The Effect of Attack by the Ambrosia Beetle Trypodendron lineatum (Olivier) on Log Attractiveness

The effect of attack by the ambrosia beetle Trypodendron lineatum (Olivier) on log attractiveness was studied using "greenhouse" cages, in which solar heating causes release of odor-bearing air beneath glass-barrier traps. In all eight replicates of a test, attack by female beetles was followed by a marked increase in attractiveness of logs. This "secondary" attraction was strong within 2–3 days after attack, continued for many weeks if females remained alone, but disappeared following mating.