Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
1990
Authors
Odd Eilertsen Rune Halvorsen Økland Tonje Økland Oddvar PedersenAbstract
No abstract has been registered
Authors
Seif S. Madoffe Øystein AustaråAbstract
Growing for a period of 24 weeks after being infested with pine woolly aphids, Pinus patula seedlings lost 12.2 and 14.1 per cent diameter and height growth respectively, compared to uninfested seedlings. Reduction in dry weight biomass production amounted to 27.8 per cent for the roots and 20.9 per cent for the shoots and stems.
Authors
Mette Goul ThomsenAbstract
No abstract has been registered
Authors
Dan AamlidAbstract
No abstract has been registered
Authors
Malcolm M. Furniss Halvor Solheim Erik ChristiansenAbstract
Spores characteristic of the tree pathogenic blue-stain fungus, Ophiostoma polonicum Siemasko, and other fungi are visible in scanning electron micrographs of pits on the pronotum and elytra of Ips typographus (L.). Inoculation and reisolation experiments showed that O. polonicum was transmitted to logs of generally higher frequencies by live beetles and their excised parts (head, prothorax, or elytra) than by the digestive tract. Other associated fungi isolated at high frequencies from I . typographus were O. bicolor Davidson Wells, O. penicillatum (Grosmann) Siemasko, Graphium sp., and yeasts.
Authors
Leiv M. Mortensen Oddvar SkreAbstract
Seedlings of Betula Pubescens, B. verrucosa and Alnus Incana were grown for 50 days in growth chambers at four ozone concentrations for 7 hr per day. Shoot and root dry weight decreased almost linearly with increasing ozone concentration in the three species. Shoot/root and leaf/stem dry weight werealmost unaffected by the treatment, while leaf senescence was significantly enhanced. Visible injury was observed at 53 nl per l and above.
Authors
Tore SkrøppaAbstract
No abstract has been registered
Authors
Tor J. JohansenAbstract
No abstract has been registered
Authors
Tor J. JohansenAbstract
No abstract has been registered
Abstract
No abstract has been registered