Root Beetles, Stand Disturbance, and Management of Black-Stain Root Disease in Plantations of Douglas-fir : Insects Affecting Reforestation. Biology and Damage

1989

3 Abb., 2 Tab., 18 Lit. Ang.

Unselbständiges Werk

9091

200069373

The root bark beetles Hylastes nigrinus (Coleoptera: Scolytidae), Pissodes fasciatus, and Steremnius carinatus (Coleoptera: Curculionidae) are vectors of Ceratocystis (Verticicladiella) wageneri, causal agent of black-stain root disease of Douglas-fir. Stand disturbance provides the link coupling host to vectors and pathogen and mediates the epidemiology of this root beetle-root disease association. Disturbance agents may be environmental, biological, or anthropogenic and include factors such as windthrow, root disease, logging, thinning, and road construction. Forest management practices have intensified the disturbance regime of Douglas-fir forests: consequently, the root beetle- black-stain root disease association is an emerging pest problem. A crop production/pest management systems is proposed. Opportunities for pest management are linked with the crop production system at times when pests enter the crop during forest management.