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.
1996
Authors
Arnstein Orlund Øystein AustaråAbstract
During 1987-90 heavy infestations of Sitka spruce (Picea sitchensis) plantations by the green spruce aphid Elatobium abietinum were reported from the coastal areas of Møre and Romsdal county, Norway. Annual growth ring width analyses in 1992 showed that minimum growth ring width occurred 6 years after the first infestation. For trees with breast height diameters more than or equal to 20 cm, the loss in diameter increment amounted to an average of 40.5% for 1988-95 compared to control trees (loss equals 3.2 years of normal growth). Growth loss was less pronounced for smaller diameter classes, and the smallest trees even exhibited an increase in increment during the first years of infestation. Possible reasons for different growth patterns are discussed.
Abstract
No abstract has been registered
Authors
Shabani A.O. Chamshama A.G. Mugasha Bjørn LangerudAbstract
No abstract has been registered
Authors
Shabani A.O. Chamshama Bjørn Langerud A.G. MugashaAbstract
No abstract has been registered
Authors
Lars Sandved Dalen Øystein Johnsen Gunnar OgnerAbstract
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Authors
Mette Goul ThomsenAbstract
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Authors
Jørn-Frode NordbakkenAbstract
No abstract has been registered
Authors
Martin WernerAbstract
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Authors
Hannu KokkonenAbstract
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Abstract
No abstract has been registered