Abstract: The Siberian moth Dendrolimus sibiricus Tschetv. (Lepidoptera, Lasiocampidae) isthe most destructive defoliator of conifers in Northern Asia. Its outbreaks have tremendous effectboth on native forest ecosystems and forest industry. During 1998-2002 an analogue of the pestsex pheromone called “Denalol” (Z5,E7-dodecadienal and Z5,E7-dodecadienol mixture in 1:1ratio) was developed and tested in the field. It showed a high attractiveness for the Siberian mothmales in different parts of its range: from Urals to the Pacific Ocean. At the same time, dispenserand pheromone trap for the male moths catches were designed.