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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.

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1984

Report – Improvement of elderly annual ring measure equipment with an APPLE II micro computer

Erik N. Mønness

Meddelelser fra Norsk institutt for skogforskning, 38.13 1984. 6 s.

Authors

Erik N. Mønness

Abstract

No abstract has been registered

Lecture – Quantitative gentics in tree breeding

Tore Skrøppa

Kurs om langsiktig foredlingsstrategi, Uppsala. 26.01.1984

Authors

Tore Skrøppa

Abstract

No abstract has been registered

Report – Simulation model for the analysis of optimal timberstock throughout the year

Ole Hofstad

Meddelelser fra Norsk institutt for skogforskning, 38.15 1984. 21 s.

Authors

Ole Hofstad

Abstract

No abstract has been registered

Report – The micromorphology of some Norwegian forest soils

G.K. Rutherford, Arne Olav Stuanes

Meddelelser fra Norsk institutt for skogforskning, 38.16 1984. 12 s.

Authors

G.K. Rutherford Arne Olav Stuanes

Abstract

No abstract has been registered

1983

Academic – 31P- NMR of humic acids isolated from two different peat soils in Norway

Gunnar Ogner, Bjørn Langerud

Acta Agriculturae Scandinavica , 33 1983. 143-144

Authors

Gunnar Ogner Bjørn Langerud

Abstract

No abstract has been registered

Lecture – A theoretical and empirical discussion of selection in clonal forestry

Tore Skrøppa

The North American Quantitative Forest Genetics Group Meeting, Toronto. 21.09.1983

Authors

Tore Skrøppa

Abstract

No abstract has been registered

Report – Artificial inoculation with Ips typographus-associated blue stain fungi can kill healthy Norway spruce trees

Richard Horntvedt, Erik Christiansen, Halvor Solheim, ...

Meddelelser fra Skogforsk, (38.4) 1983. 20 p.

To document

Authors

Richard Horntvedt Erik Christiansen Halvor Solheim Shasheng Wang

Abstract

An infection experimcnt was made to test the pathogenicity of two Ceratocystis species on Norway spruce trees. Water stress in inoculated and control trees was measured by means of xylem water potential, stomatal aperture and transpiration stream velocity. Most trees inoculated with C. polonica, alone or in combination with C. penicillata, became water-stressed. Ten weeks after inoculation almost all sapwood of water-stressed trees was blue-stained at the level of inoculation. Trees inoculated with C. penicillata alone did not become water-stressed, and their sapwood was not blue-stained. The results indicate that C. polonica is a highly qualified accomplice to Ips typographus in its killing of spruce trees.

Academic – Combined Ips/Ceratocystis attack on Norway spruce, and defensive mechanisms of the trees

Erik Christiansen, Richard Horntvedt

Zeitschrift für angewandte Entomologie, 96 1983. 110-118

Authors

Erik Christiansen Richard Horntvedt

Abstract

The spruce bark beetle, Ips typographus, infects Norway spruce trees with blue-stain fungi, amongst which several species of Ceratocystis are found. Artificial inoculation of healthy trees with C. polonica caused in several cases increased water stress of the trees, and complete sapwood staining. The defences of spruce against Ips/Ceratocystis attack appear to depend on 1. the output of constitutive resin from severed resin ducts, and 2. accumulation of secondary resin around the attack sites. Our preliminary studies indicate that the amount of both types of resin may vary considerably between trees, as well as from place to place on the same tree. A dose/response experiment based on artificial inoculation of C. polonica indicated that at a certain dose (i.e. number of infections per unit area), the accumulation of secondary resin decreased, and the fungus was able to overcome the host defence.

Report – Composting av lindane-sprayed bark

Knut Solbraa

Meddelelser fra Norsk institutt for skogforskning, 38.9 1983. 7 s.

Authors

Knut Solbraa

Abstract

No abstract has been registered

Report – Damage by the spruce bark beetle in South Norway 1970-1980 : a survey, and factors affecting its occurrence

Richard Worrell

Meddelelser fra Norsk institutt for skogforskning, 38.6 1983. 34 s.

Authors

Richard Worrell

Abstract

No abstract has been registered

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