Puddle trap for bark beetles. The puddle trap as I have called it, consists of a bowl or plastic-lined puddle with water (which
can have detergent to make beetles sink) and a suspended barrier/bait container that flying beetles strike and tumble down (the barrier can be covered with aluminum foil to stop sunlight from damaging one of the pheromone
components). In the puddle at left there are larger specks (Ips typographus) and very tiny specks (Pityogenes chalcographus). These two
bark beetles are very common and kill Norway spruce, one of the two most important timber trees in Europe. The puddle trap is
described in more detail in Byers (1993) .
Images © 1996 by John A. Byers, Chemical Ecology.