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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1971

– Infection biology and chemical control of Scleroderris lagerbergii Gremmen on Pinus sylvestris L.

Arild Sletten

Meddelelser fra Det norske Skogforsøksvesen, 29 1971. 113-134

Authors

Arild Sletten

Abstract

No abstract has been registered

– Developmental stages in ovaries of pine weevils, Hylobius abietis L. (Coleoptera: Curculionidae), present in reforestation areas during the first years after the final felling

Erik Christiansen

Meddelelser fra Det norske Skogforsøksvesen, 28 1971. 389-415

Authors

Erik Christiansen

Abstract

No abstract has been registered

– Cold-hardiness in eggs of Neodiprion sertifer (Geoffr.) (Hymenoptera: Diprionidae) under natural conditions

Øystein Austarå

Norsk Entomologisk Tidsskrift, 18 1971. 45-48

Authors

Øystein Austarå

Abstract

No abstract has been registered

– Potebniamyces coniferarum, literature review : occurrence on Larix russica in Iceland

Finn Roll-Hansen, Helga Roll-Hansen

Meddelelser fra Det norske Skogforsøksvesen, 28 1971. 527-556

Authors

Finn Roll-Hansen Helga Roll-Hansen

Abstract

No abstract has been registered

– Orgyia mixta Snell. (Lepidoptera: Lymantriidae), a defoliator of exotic softwoods in Kenya

Øystein Austarå

East African Agricultural and Forestry Journal, 36 1971. 298-307

Authors

Øystein Austarå

Abstract

Lists the recorded hosts (coniferous and broadleaved species) and localities of O. mixta in Kenya; describes its life history; estimates the relation between degree of defoliation and population density; and discusses natural control and laboratory tests of three insecticides against late-instar larvae.

– Isotope studies on nitrogen in forest soil. I. Relative losses of nitrogen through leaching during a period of forty months

Lars N. Overrein

Meddelelser fra Det norske Skogforsøksvesen, 29 1971. 261-280

Authors

Lars N. Overrein

Abstract

No abstract has been registered

– Time of attack by the pine weevils (Hylobius abietis L.) in young reforestation areas

Erik Christiansen

Meddelelser fra Det norske Skogforsøksvesen, 28 1971. 417-427

Authors

Erik Christiansen

Abstract

No abstract has been registered

– Isotope studies on the leaching of different forms of nitrogen in forest soil

Lars N. Overrein

Meddelelser fra Det norske Skogforsøksvesen, 28 1971. 331-351

Authors

Lars N. Overrein

Abstract

No abstract has been registered

– Laboratory study of factors influencing pre-imaginal development in Hylobius abietis (Col., Curculionidae)

Erik Christiansen

Norsk Entomologisk Tidsskrift, 18 1971. 1-8

Authors

Erik Christiansen

Abstract

No abstract has been registered

1970

– Studies on a particular dieback of terminal shoots of Pinus sylvestris L.

Kåre Olav Venn

Meddelelser fra Det norske Skogforsøksvesen, 27 1970. 507-536

Authors

Kåre Olav Venn

Abstract

Reviews records of the occurrence of terminal dieback in P. sylvestris in Norway from 1863, and describes the symptoms and distribution of damage occurring in 1963. Sample trees ca. 0.5-2.0 m. high from 50 localities in which damage had occurred, and meteorological records for these areas, were studied. In view of the apparent connexion with summer frosts, special attention was paid to the development of annual rings and the occurrence of frost rings in the late wood. Results indicated that for every summer in which damage occurred there had been a short growing season with very low mean temperatures, and this had generally been preceded by a favourable summer in the previous year. These conditions appear to lead to insufficient development of the shoots, which do not acquire their normal frost hardiness. Such predisposed shoots may be injured by frost during the following dormant period or, as probably happened in 1963, by unfavourable early spring weather.

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