Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2007
Forfattere
Maria Herrero Brita Toppe Trond RafossSammendrag
P.ramorum ble for første gang funnet i Norge i 2002 på Rhododendron catawiense. Mattilsynet gjenomførte en kartlegging i 2003-2006. Patogenet er utbredt i gartnerier i Sør-Norge, hovedsakelig på Rhododendron, men det har også vært påvist på Pieris japonica, Kalmia sp. og Syringa sp. Patogenet er også funnet på godt etablerte planter av Rhododendron og Viburnum i parker i Bergen og Stavanger. P.ramorum er videre funnet i importsendinger av Rhododendron og Viburnum.
Forfattere
Maria HerreroSammendrag
Oppsummering 2004-2006
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Sammendrag
Model simulations show that an increased frequency in storms and drought periods may result in more frequent and shorter outbreaks of bark beetles. Warmer summers can result in two bark beetle generations per summer instead of one, giving bark beetles the opportunity to attack forests twice in a single year.
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Sammendrag
Studies of defense mechanisms in Norway spruce Picea abies against the spruce bark beetle Ips typographus show that inducible defenses are triggered by unsuccessful beetle attacks. Moreover, spruce trees can be vaccinated against bark beetle attacks through stem bark inoculation with Ceratocystis polonica, an aggressive fungal associate of Ips typographus. Artificial inoculation with certain other fungi has a similar effect, making treated trees a tougher mach for attacking beetles. A similar enhancement of resistance can be achieved by stem surface treatment with methyl jasmonate. Enhanced resistance is associated with the formation of traumatic resin ducts, and mobilization of phenolic substances in living parenchyma cells. The phenolics appear to mix with the traumatic resin. Similar mechanisms are operating in other conifers. We hypothesize that unsuccessful beetle attacks produce a vaccination effect in the trees, enhancing their resistance to later attack. Adding the effect of induced resistance as a model factor shows an immediate effect on the population dynamics of Ips typographus.
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The area of wood protection is in a period of change. New tools are needed to understand the mode of action, and to further improve the new wood protection systems. A set of useful tools are found among the molecular methods. This paper presents an overview of some of the tools available, and the methods are exemplified by papers within the frame of wood protection issues. However, there is still a great unexplored potential within the field of wood protection by the use of various molecular methods. The majority of the work using molecular methods has been performed on species identification issues and within species variation. This paper lists some new promising molecular methods for wood protection issues and a presentation of a new project. The new project will help to gain some new knowledge about how the fungal decay processes are affected by different wood modification systems.
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