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.
2009
Authors
Halvor SolheimAbstract
Det er ikke registrert sammendrag
Authors
Halvor SolheimAbstract
Det er ikke registrert sammendrag
Authors
Halvor SolheimAbstract
Det er ikke registrert sammendrag
Authors
Halvor SolheimAbstract
Kreftkjuke er vanlig og utbredt i hele landet. Den er svært vanlig på bjørk, men forekommer på flere andre treslag; lønn, or, osp og rogn. Alm har sin egen kreftkjuke, almekreftkjuke. Kreftkjuke har en nordlig cirkumpolar utbredelse, og i enkelte områder er blant annet bøk mye utsatt for infeksjon.
Authors
Halvor SolheimAbstract
Knivkjuke er svært vanlig og utbredt i hele landet helt nord til Nordkapp. Den vokser kun på bjørk, og finnes på den nordlige halvkule der bjørkeslekta er utbredt.
Authors
Halvor SolheimAbstract
Flatkjuke er svært vanlig langs kysten i Sør-Norge og er funnet så langt nord som til Saltdal. Den etablerer seg på alle mulige slags løvtrær, men kan i tillegg også gå på bartrær. Den er funnet noen ganger i høyereliggende strøk på Østlandet på selje eller osp.
Authors
Trond Hofsvang Brita ToppeAbstract
Det er ikke registrert sammendrag
Authors
Agnethe ChristiansenAbstract
Det er ikke registrert sammendrag
Authors
May-Guri Saethre Arnstein Staverløkk Trond HofsvangAbstract
The history of Harmonia axyridis and a summary of surveillance & research in Norway till June 2009 are given. H. axyridis was assessed as a potential bio-control agent for use in Norwegian greenhouses in 2001. The risk of establishment outdoors was assessed too high and no permission was given. The first record in Norway was in 2006 when one adult was found on Thuja sp. imported from the Netherlands. In late 2007 and throughout 2008 adults were found indoors/outdoors at several locations in the Oslo-area. Establishment outdoors became evident. Observations in Aust-Agder and Vestfold revealed further spread/introduction to new areas. The bioclimatic potential of H. axyridis was assessed in 2007 by the aid of CLIMEX and national agrometeorological data, showed that suboptimal microclimates for the species can be found in the coastal areas of the south. In late 2008 a web-site was launched aiming to engage the public to submit observations on-line and has contributed to monitor development of the species across the country. Competition experiments with H. axyridis and Coccinella septempunctata in 2008/2009 showed that only H. axyridis eggs & larvae survived when the two species were mixed.
Authors
Carl Gunnar Fossdal Nadeem Yaqoob Halvor SolheimAbstract
The root-rot causing fungus Heterobasidion annosum senso lato is the most devastating pathogen of conifers in Europe. This pathogen enter Norway spruce trees trough the roots and colonizes the tree from within, growing as a saprophyte when established within the dead heartwood and acting as a necrotroph when in contact with living host tissue. The genome of this devastating pathogen has now been sequenced in collaboration with JGI and gene annotation is ongoing and genomic work is currently in progress (Stenlid et al. work in progress). We have worked with the host Norway spruce from a molecular perspective for more than ten years. Twenty percent of the trees in Norwegian spruce stands tend to be infected and this pathogen that can colonize ten meters up inside the trunk. The tree have defences against this pathogen and the attack can be fought off by the bark and living wood but not by the hearthwood. The tree has a unique defense against this internal attack by forming a reaction zone; in this case the host defense is directed inwardly by the still living sapwood toward the central colonized wood. We have in the last years studied the host responses to infection in Norway spruce clones at the transcriptional level and found that the speed of recognition and spatial defense signalling appears to be the hallmarks of trees with high degree of resistance. We strive to study both partners in this pathosystem from a molecular perspective, and are using suppressive subtractive hybridization (SSH) followed by Real-Time RT PCR verification to look at differentially expressed genes(Yakovlev et al. 2008). In addition the colonization profiles are followed on extracted gDNA using quantitative Real-Time PCR (Hietala et al. 2009).