Browsing NIBIO Brage by Author "Krokene, Paal"

Bark beetle outbreaks in Europe: state of knowledge and ways forward for management

Hlásny, Tomáš; König, Louis; Krokene, Paal; Lindner, Marcus; Montagné-Huck, Claire; Müller, Jörg; Qin, Hua; Raffa, Kenneth F.; Schelhaas, Mart-Jan; Svoboda, Miroslav; Viiri, Heli; Seidl, Rupert (Peer reviewed; Journal article, 2021-07-28)

Purpose of Review Outbreaks of tree-killing bark beetles have reached unprecedented levels in conifer forests in the northern hemisphere and are expected to further intensify due to climate change. In parts of Europe, bark ...

Bark Beetle Population Dynamics in the Anthropocene: Challenges and Solutions

Biedermann, Peter H.W.; Müller, Jörg; Grégoire, Jean-Claude; Gruppe, Axel; Hagge, Jonas; Hammerbacher, Almuth; Hofstetter, Richard W.; Kandasamy, Dineshkumar; Kolarik, Miroslav; Kostovcik, Martin; Krokene, Paal; Sallé, Aurélien; Six, Diana L.; Turrini, Tabea; Vanderpool, Dan; Wingfield, Michael J.; Bässler, Claus (Journal article; Peer reviewed, 2019)

Tree-killing bark beetles are the most economically important insects in conifer forests worldwide. However, despite >200 years of research, the drivers of population eruptions and crashes are still not fully understood ...

Bark Beetle-Associated Blue-Stain Fungi Increase Antioxidant Enzyme Activities and Monoterpene Concentrations in Pinus yunnanensis

Pan, Yue; Zhao, Tao; Krokene, Paal; Yu, Ze-fen; Qiao, Min; Lu, Jun; Chen, Peng; Ye, Hui (Journal article; Peer reviewed, 2018-11-27)

Yunnan pine is the most important tree species in SW China in both economical and ecological terms, but it is often killed by pine shoot beetles (Tomicus spp.). Tomicus beetles are secondary pests in temperate regions and ...

Carbon castles and insect invaders: dissecting physical defences in conifer stems

Krokene, Paal (Journal article; Peer reviewed, 2016)

Conifer Stored Resources and Resistance to a Fungus Associated with the Spruce Bark Beetle Ips typographus

Lahr, Eleanor C.; Krokene, Paal (Journal article; Peer reviewed, 2013-08-13)

Bark beetles and associated fungi are among the greatest natural threats to conifers worldwide. Conifers have potent defenses, but resistance to beetles and fungal pathogens may be reduced if tree stored resources are ...

Convergent evolution of semiochemicals across Kingdoms: bark beetles and their fungal symbionts

Zhao, Tao; Ganji, Suresh; Schiebe, Christian; Bohman, Björn; Weinstein, Philip; Krokene, Paal; Borg-Karlson, Anna-Karin; Unelius, C. Rikard (Journal article; Peer reviewed, 2019-02-15)

Convergent evolution of semiochemical use in organisms from different Kingdoms is a rarely described phenomenon. Tree-killing bark beetles vector numerous symbiotic blue-stain fungi that help the beetles colonize healthy ...

Effects of mild drought on the morphology of sun and shade needles in 20-year-old Norway spruce trees

Gebauer, Roman; Volařík, Daniel; Urban, Josef; Børja, Isabella; Nagy, Nina Elisabeth; Eldhuset, Toril Drabløs; Krokene, Paal (Journal article; Peer reviewed, 2019-02-28)

Several studies have looked at how individual environmental factors influence needle morphology in conifer trees, but interacting effects between drought and canopy position have received little attention. In this study, ...

Epitype-inducing temperatures drive DNA methylation changes during somatic embryogenesis in the long-lived gymnosperm Norway spruce

Viejo, Marcos; Tengs, Torstein; Yakovlev, Igor; Cross, Hugh; Krokene, Paal; Olsen, Jorunn Elisabeth; Fossdal, Carl Gunnar (Peer reviewed; Journal article, 2023-07-20)

An epigenetic memory of the temperature sum experienced during embryogenesis is part of the climatic adaptation strategy of the long-lived gymnosperm Norway spruce. This memory has a lasting effect on the timing of bud ...

Forest damage. A guide to the identification of damage causes - Norwegian national list

Hylen, Gro; Krokene, Paal; Larsson, John Y.; Solheim, Halvor; Timmermann, Volkmar (Håndbok fra Skog og landskap;08/2007, Research report, 2007-04)

The Norwegian Monitoring Programme for Forest Damage (OPS) has since its start registered damage to selected trees. The aim of the registrations has been to explain variations in crown density and crown colour. In answer ...

Fra en til to generasjoner granbarkbille i Norge? Statusanalyse med data fra klekking og barkbilleovervåkingen.

Økland, Bjørn; Lange, Holger; Krokene, Paal; Buran, Rolf; Finne, Ellen A. (NIBIO-rapport;7(106) 2021, Research report, 2021-06)

Overgang fra en til to generasjoner av stor granbarkbille med varmere klima vil kunne øke mengden av skader i norske skoger på grunn av to angrepsperioder. Sommertemperaturene i Norge har vært økende siden 1970-tallet og ...

Fra en til to generasjoner granbarkbille i Norge? Statusanalyse med data fra klekking og barkbilleovervåkingen.

Økland, Bjørn; Lange, Holger; Krokene, Paal; Buran, Rolf; Finne, Ellen A. (NIBIO-rapport;7(106) 2021, Research report, 2021-06)

Overgang fra en til to generasjoner av stor granbarkbille med varmere klima vil kunne øke mengden av skader i norske skoger på grunn av to angrepsperioder. Sommertemperaturene i Norge har vært økende siden 1970-tallet og ...

Fungal associates of the tree-killing bark beetle, Ips typographus, vary in virulence, ability to degrade conifer phenolics and influence bark beetle tunneling behavior

Zhao, Tao; Kandasamy, Dineshkumar; Krokene, Paal; Chen, Jingyuan; Gershenzon, Jonathan; Hammerbacher, Almuth (Journal article; Peer reviewed, 2018-07-20)

The bark beetle Ips typographus carries numerous fungi that could be assisting the beetle in colonizing live Norway spruce (Picea abies) trees. Phenolic defenses in spruce phloem are degraded by the beetle's major tree-killing ...