Dedek, W., J. Pape, F. Grimmer, and H. J. Korner. 1988. Integrated pest control in forest management: combined use of pheromones and insecticides for attracting and killing the bark beetle Ips typographus. II. Effects of methamidophos treatment following bark penetration into the ascending sap of pheromone-baited spruce. Forest Ecology and Management 26: 63-76.