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 ToppeSammendrag
Pythium aphanidermatum er hos oss best kjent som årsak til aggresiv rothalsråte i veksthusagurk. For første gang er patogenet nå også påvist i forbindelse med rotråte i norske julestjerner
Forfattere
Arne Hermansen Maria Herrero Elisa Gauslå Jafar Razzaghian Ragnhild Nærstad Sonja KlemsdalSammendrag
Carrot roots with cavity spot lesions from 8 different counties in Norway were sampled and Pythium species were isolated on selective medium. Pythium spp. were characterised morphologically and by species-specific PCR. Laboratory experiments with inoculations of carrot roots were performed. A total of 130 isolates out of 230 Pythium-like isolates tested with PCR were identified as pathogenic species of Pythium. These were P. intermedium (29 %), P. sulcatum (23 %), P. sylvaticum (16 %), P. violae (15 %) and a possible new Pythium species designated P. "vipa" (18 %). There were some difference between geographical regions and ages of cavities regarding the frequency of the different species isolated. When rating sunken lesions in the laboratory inoculation experiments, P. "vipa" was the most aggressive and P. violae the least aggressive species. P. intermedium and P. "vipa" caused more discolouration of the infected carrot tissue than the other species. The importance of the different Pythium spp. as agents of cavity spot in Norway is discussed.
Forfattere
Leif SundheimSammendrag
Med dagens fytosanitære regelverk og praksis for bekjemping av pærebrann i Noreg er det låg sannsynlegheit for introduksjon av pærebrann til fruktdistrikt og planteskular. Lemping på noverande regelverk og praksis vil føre til moderat risiko for introduksjon
Forfattere
Leif SundheimSammendrag
Med dagens fytosanitære regelverk og praksis for bekjemping av pærebrann i Noreg er det låg sannsynlegheit for introduksjon av pærebrann til fruktdistrikt og planteskular. Lemping på noverande regelverk og praksis vil føre til moderat risiko for introduksjon
Forfattere
Arild Sletten Leif SundheimSammendrag
Pærebrann er en alvorlig sjukdom på eple, pære og prydplanter i rosefamilien. De siste femti år har sjukdommen vært under spredning i Europa. Bakterien som forårsaker pærebrann er en fremmed art under spredning i Norge.
Sammendrag
Furfurylated wood is an environmentally friendly, chemically treated, wood product with improved characteristics. Quality control of furfurylated wood is still performed manually by subtracting the initial weight of a treated sample from its final weight, then dividing the result by the initial weight. Expressed as a percentage, this results in a value that represents the weight percent gain (WPG) of the treated sample and thus the degree of modification. The major disadvantage of this quality control method is that the production parameters are needed to determine WPG, since the initial weight cannot be deduced from a treated wood sample. In this paper the use of ThermoGravimetric Analysis (TGA) is presented as a potential quality control method for furfurylated Scots pine (Pinus sylvestris L.). The technique is independent of production parameters and, therefore, enables third parties to determine the WPG of any furfurylated wood product. Three validation trials have been performed with the same validation samples, but varying TGA settings and with different Partial Least Square regression models (PLS-models). Although the method needs further improvement, it has shown good accuracy and precision. Therefore, it is con
Forfattere
Karlsson Magnus Ari Hietala Harald Kvaalen Halvor Solheim Åke Olson Jan Stenlid Carl Gunnar FossdalSammendrag
Det er ikke registrert sammendrag
Sammendrag
Perpetual-flowering strawberry cultivars are commonly classified as photoperiodically day-neutral, even though early investigations demonstrated long-day (LD) regulation. An important reason for this inconsistency is that these freely flowering plants are difficult to establish in a true vegetative state, and experiments have therefore, often been started using runner plants with pre-formed inflorescences. In order to circumvent this problem, we have used the perpetual-flowering F1-hybrid `Elan" that is propagated by seed, and is thus not pre-conditioned by its earlier life history. The results demonstrated a marked quantitative LD response across a range of temperatures from 9º - 27ºC. Seedlings were responsive to the LD stimulus at an early stage, and early flowering required LD exposure almost from germination. The critical daylength for the early flowering response was about 15 h at 18ºC. Because of this threshold LD response, it is concluded that regulation of flowering is truly photoperiodic in nature, and not merely an effect of additional light. Flower development was also slightly advanced by LD conditions. Stolon formation was strongly enhanced by short day conditions in combination with high temperature. Thus, not only flowering, but also runnering, was oppositely affected by photoperiod in `Elan" compared with mono-flowering cultivars. The results are discussed in relation to the photoperiodic classification of strawberries.
Forfattere
Anita Sønsteby Ola M. HeideSammendrag
Perpetual-flowering strawberry cultivars are commonly classified as photoperiodically day-neutral, even though early investigations demonstrated long-day (LD) regulation. An important reason for this inconsistency is that these freely flowering plants are difficult to establish in a true vegetative state, and experiments have therefore often been started using runner plants with pre-formed inflorescences. In order to circumvent this problem, we have used the perpetual-flowering F-1-hybrid 'Elan' that. is propagated by seed, and is thus not pre-conditioned by its earlier life history. The results demonstrated a marked quantitative LD response across a range of temperatures from 9 degrees - 27 degrees C. Seedlings were responsive to the LD stimulus at an early stage, and early flowering required LD exposure almost from germination. The critical daylength for the early flowering response was about 15 h at 18 degrees C. Because of this threshold LD response, it is concluded that regulation of flowering is truly photoperiodic in nature, and not merely an effect of additional light. Flower development was also slightly advanced by LD conditions. Stolon formation was strongly enhanced by short-day conditions in combination with high temperature. Thus, not only flowering, but also runnering, was oppositely affected by photoperiod in 'Elan' compared with mono-flowering cultivars. The results are discussed in relation to the photoperiodic classification of strawberries.
Forfattere
Liv OstremSammendrag
Ein forsøksserie vart starta i 2005 for å sjå på avlings-, fôrkvalitets- og overvintringspotensialet ved slått og beiteregime til nokre aktuelle utanlandske raisvingelsortar og ein norsk kandidatsort, samanlikna med viktige marknadssortar av fleirårig raigras. I ein forsøksserie som vart starta i 2003, vart to raisvingelsortar samanlikna med ei vanleg nytta frøblanding (timotei, engsvingel og kløver) med 10% fleirårig raigras. I tillegg til reine sortar og frøblanding, vart raigras og engsvingel i frøblandinga erstatta med dei to raisvingelsortane for å sjå korleis sortane klarte seg i ei blanding.