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.
1997
Authors
Svein SolbergAbstract
No abstract has been registered
Authors
Dan AamlidAbstract
No abstract has been registered
Abstract
No abstract has been registered
Authors
Birger Solberg A. MoiseyevAbstract
No abstract has been registered
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Jan Mulder Petter Nilsen Arne Olav Stuanes Magne HuseAbstract
No abstract has been registered
Authors
Birger Solberg Asbjørn SvendsrudAbstract
Artikkelen gir en oversikt over utviklingen i norsk skogforskning sid en 1927. A review is given of the development of forest research in Norway sin ce 1927.
Authors
Egil HaugeAbstract
No abstract has been registered
Authors
Erik Christiansen Alf BakkeAbstract
Availability of defenceless or weakly defended breeding material, e.g. trees felled or damaged by major wind storms, is a necessary requirement for an outbreak of the spruce bark beetle. Water stress is also hypothesised to be an important predisposing factor, although this idea is mostly based on circumstantial observation of a coincidence between dry weather and beetle outbreaks. Whereas a causal relationship may well exist for certain scolytid beetles, experimental evidence is often scarce and in some cases contradictory. We examine information pertaining to population dynamics of the spruce bark beetle Ips typographus in Norway. This includesexperiments to assess effect of drought stress on host tree susceptibility to the beetle’s pathogenic fungal associate, Ceratocystis polonica, andresults from a population monitoring program which has been in operation since 1980. Because drought often coincides with hot weather, one can confuse a direct effect on beetle propagation by hot weather with an indirect effect on insect dynamics through predisposition of the host trees. We conclude that apart from extremely rare cases of severe droughts lasting for a long period of time, direct effects of spring weather on beetle propagation are more likely to affect I. typographus dynamics than are indirect physiological effects working through the host trees.
Authors
Tor MykingAbstract
No abstract has been registered
Authors
Jorunn Elisabeth Olsen Olavi Junttila Jarle Nilsen M. E. Eriksson Inger Martinussen Olaf Olsson Göran Sandberg Thomas MoritzAbstract
Resultatene i arbeidet indikerer at den fotoperiodiske responsen hos tre kan være regulert av mengde PHYA genuttrykk, og at mengden av fytokrom A påvirker metabolismen av GAs (gibberelliner) og IAA (auxin).