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Publikasjoner

NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.

1996

Sammendrag

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.