• Sanders, C. J.
  Canadian Forestry Service
  

The efficiency of two sticky-bottomed traps and seven high-capacity, nonsticky traps in catching male spruce budworm [Choristoneurafumiferana (Clem.)l moths was evaluated in a wind tunnel. The place where the male moths first contacted the trap, the length of time that passed until they entered the trap, and the number remaining in the trap after 5 min were recorded. The most efficient traps were the Pherocon lC, a sticky bottomed trap, and the Multi-Pher and Uni+rap, both nonsticky traps with internal funnel-shaped baffles that prevent moths from escaping. As sticky traps become saturated at relatively low densities they are not suitable for monitoring wide changes in population density. The Multi-Pher and Uni-trap are therefore recommended for monitoring population changes of the spruce budworm, establishing thresholds for management action, and estimating population density.