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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.

1985

Sammendrag

At a certain point in time during a bark beetle aggregation on a host tree a deadly number of attacks is reached, provided suitable swarming conditions and beetle abundance. This threshold of successful attack was studied in Norway spruce using: 1. pheromone-elicited attacks by Ips typographus, and 2. artificial inoculations of the blue-stain fungus Ceratocystis polonica. The experiments showed that 150-200 beetle attacks or fungal inoculations to trees of 20 cm DBH caused considerable blue-staining of the sapwood, leading to a high tree mortality. The results are discussed in relation to tree and stand characteristics, and to climatic conditions.