Abstract
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.