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
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No abstract has been registered
Authors
Darrell W. Ross Halvor SolheimAbstract
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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.
Authors
Sondre SkatterAbstract
No abstract has been registered
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Nils RymanAbstract
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Erik Christiansen Øystein AustaråAbstract
Potted Scots pine plants had their water supply severely reduced. N. sertifer larvae remained caged on the plants from larval hatching to cocoon spinning. The treatment accelerated larval development and increased adult size, compared to insects on well-watered controls. Larval mortality tended to be lower in stressed trees, but seemed partly determined by genetical factors. Such factors appeared to be of minor significance for developmental rates and adult size.
Authors
Sondre SkatterAbstract
No abstract has been registered
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Camilla BaumannAbstract
No abstract has been registered
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Tapani PöykköAbstract
No abstract has been registered