Johann, M. 1986b. Zur Anlockung des Buchdruckers (Ips typographus L.). II. Moglichkeiten der integration Naturlich en Brutmaterials in die Bekampfung mit Pheromon [Attraction of the engraver beetle (Ips typographus). II. Possibilities of the integration of natural breeding materials into control by pheromones] [English summary]. Journal of Applied Entomology 102: 115-123.