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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.

NIBIO's Scientific Publications →

2023

Authors

Igor A. Yakovlev Marcos Viejo Jorunn Elisabeth Olsen Torstein Tengs Carl Gunnar Fossdal

Abstract

No abstract has been registered

Authors

Marcos Viejo Igor A. Yakovlev Torstein Tengs Jorunn Elisabeth Olsen Carl Gunnar Fossdal

Abstract

No abstract has been registered

To document

Authors

Stephanie Saussure Annette Bruun Jensen Marie Louise Davey Annette Folkedal Schjøll Karin Westrum Ingeborg Klingen

Abstract

In Scandinavia, the bird cherry-oat aphid Rhopalosiphum padi overwinter as eggs on the bird cherry tree Prunus padus. Branches of P. padus were collected at the late February / early March from 17 locations in Norway over a three-year period. We found 3599 overwintering aphid eggs, 59.5% of which were dead. Further, a total of 879 overwintering fungus-killed cadavers were observed. These cadavers were found close to bud axils, where overwintering eggs were also usually attached. Cadavers were infected with either Zoophthora cf. aphidis or Entomophthora planchoniana. All the fungal-killed cadavers were filled with overwintering structures of Z. cf. aphidis (as resting spores) or E. planchoniana (as modified hyphal bodies). We found a significant negative correlation between eggs and cadavers per branch. However, both numbers of eggs and cadavers varied greatly between years and among tree locations. This is the first report of E. planchoniana overwintering in R. padi cadavers as modified hyphal bodies. We discuss whether P. padus may act as an inoculum reservoir for fungi infecting aphids in cereals in spring.

Authors

Theresa Weigl Ingunn Øvsthus Jorunn Børve Hanne Larsen Carl Gunnar Fossdal Siv Fagertun Remberg

Abstract

No abstract has been registered

Authors

Theresa Weigl Ingunn Øvsthus Hanne Larsen Carl Gunnar Fossdal Jorunn Børve Siv Fagertun Remberg

Abstract

No abstract has been registered

Authors

Theresa Weigl Jorunn Børve Hanne Larsen Carl Gunnar Fossdal Siv Fagertun Remberg

Abstract

No abstract has been registered

Authors

Theresa Weigl Jorunn Børve Hanne Larsen Carl Gunnar Fossdal Siv Fagertun Remberg

Abstract

No abstract has been registered

Authors

Dalphy Ondine Camira Harteveld Jorunn Børve Anne-Grete Roer Hjelkrem Arne Stensvand

Abstract

No abstract has been registered

Authors

Dalphy Ondine Camira Harteveld Jorunn Børve Arne Stensvand

Abstract

No abstract has been registered

Authors

Mirella Ludwiczewska Paulina Paluchowska Marta Janiszewska Erik Lysøe Simeon Rossmann Sylwester Sobkowiak Zhimin Yin May Bente Brurberg Jadwiga Śliwka

Abstract

No abstract has been registered