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
Bernt-Håvard Øyen Knut NesAbstract
No abstract has been registered
Authors
D.O. Hessen A. Henriksen Atle Hindar Jan Mulder Kjetil Tørseth N. VagstadAbstract
No abstract has been registered
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Authors
Nina JohansenAbstract
Developmental time and survival of eggs, larvae, pupae and adult females of the cabbage moth, Mamestra brassicae (L.) (Lepidoptera: Noctuidae) were investigated at different temperatures within the range of 5 to 23oC. In addition, the influence of temperature during the larval period on the weight of the succeeding pupae was studied, as well as the effect of temperature on fecundity of adult females. The lower developmental thresholds (Tb) and thermal requirement (DD) were established for all developmental stages and the larval instars using linear regression analysis. Tb and DD were 8.6°C and 75 degree-days for eggs, 5.4°C and 496 degree-days for the total larval period, 7.2°C and 304 degree-days for pupae, and 5.0°C and 56 degree-days for adult females, respectively. Pupal mortality was low at all temperatures. The survival of eggs and larvae was highest at 18oC, whereas mortality was 100% at 8.5oC. Larval mortality was highest in the first instar and decreased with increasing age. Pupae gained the highest weight when the larvae were reared at 18oC, and decreased with declining temperature. Temperature had no significant effect on total fecundity or fertility. Fecundity was basically unimodal distributed at all temperatures. At low temperatures the egg deposition period was markedly prolonged.
Editors
Guro BrodalAbstract
No abstract has been registered
Academic – Inoculum thresholds for cereal seed borne pathogens
Guro Brodal, H Røsok Bye, H. Skuterud
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Lecture – International forest policy issues and their information needs
R. Paivinen, Birger Solberg
Authors
R. Paivinen Birger SolbergAbstract
No abstract has been registered
Authors
Tor MykingAbstract
No abstract has been registered
Authors
Carl Gunnar Fossdal Praveen Sharma Anders LönneborgAbstract
No abstract has been registered