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.
2004
Sammendrag
In this survey of 2003, 600 samples were collected from 96 forest blocks in the counties of Aust-Agder and Vest-Agder in southern Norway. The sampling activity involved 19 municipalities situated mainly within the two zone sites D and E close to Kristiansand and Arendal. Samples from Scots pine (Pinus sylvestris) formed 92%, while samples of Norway spruce (Picea abies) made up 8% of the total sample volume. Timber and forest debris was the most common objects sampled. Ninety-eight percent of the samples, regardless of tree species, showed signs of Monochamus activity. Nematodes were common and occurred in 90% of the samples analysed. Eight samples of pinewood were positive for the genus Bursaphelenchus. This genus did not occur in spruce. Bursaphelenchus mucronatus was detected in 6 samples of forest debris of pine attacked by Monochamus and collected in the county of Aust-Agder. In the municipality of Evje and Hornes B. mucronatus was detected at Skjerkelia and Sutestad. In the municipality of Froland the nematode was found in two samples from Budalsfjellet, and in one sample from Mjålandsvatn. In the municipality of Birkenes one sample from Vågsdalen contained B. mucronatus. This is the fourth report on the occurrence of B. mucronatus in Norway. The pine wood nematode Bursaphelenchus xylophilus was not detected.
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Utbrot av rotstokkròte i jordbær har i stor grad samanheng med sortane som vert dyrka. Utviklinga dei siste tiåra har gått mot meir mottakelege sortar, og dette er hovudårsaka til den sterke spreiinga av sjukdomen. Ved Planteforsk har ei stor mengde sortar vortne testa dei siste åra, og også nedarving av motstandsevne mot sjukdomen har vorte studert.
Forfattere
Nina Elisabeth Nagy Carl Gunnar Fossdal Paal Krokene Trygve Krekling Anders Lönneberg Anders Lønneborg Halvor SolheimSammendrag
Polyphenolic parenchyma cells (PP cells) in Norway spruce (Picea abies (L.) Karst.) stem phloem play important roles in constitutive and inducible defenses. To determine whether anatomical and molecular changes in PP cells are correlated with tree resistance, we infected two Norway spruce clones with the pathogenic fungus Ceratocystis polonica (Siem.) C. Moreau. The fungus induced significantly different lesion lengths in the two clones, indicating that one clone was more resistant to the fungus (short lesions) than the other (long lesions). After infection, the cross-sectional area of PP cells and their vacuolar polyphenol bodies increased in the three most recent annual rings of PP cells in both clones. The more resistant clone had larger PP cells with denser polyphenol bodies than the less resistant clone, whereas the less resistant clone accumulated relatively more polyphenols after infection. Compared with the less resistant clone, the more resistant clone contained higher starch concentrations before infection that were reduced more quickly after infection before returning to original values. Low transcript levels of chalcone synthase were detected in uninfected tissues of both clones, but the levels increased dramatically after infection. Transcript levels were higher and peaked 6 days earlier in the more resistant clone than in the less resistant clone. The activity of at least one highly basic peroxidase isoform was greatly enhanced after infection, and this increase occurred earlier in the more resistant clone.
Sammendrag
I artikkelen "Brune nåler og skrot på barlind" i Gartneryrket nr. 13 i 2001, vart det nemnt at det i tillegg til soppane Pestalotiopsis sp. og Phomopsis sp. vart funne sporehus med sporar av ein sopp som på det tidspunktet ikkje var identifisert. Nye prøvar hausten 2003 av barlind (Taxus baccata) i parken ved Norges Landbrukshøgskole, syner at denne soppen framleis er til stades. Soppen er no identifisert til Cryptocline taxicola.
Sammendrag
I 2003 startet et femårig prosjekt i Norge som omfatter vekstavslutning i potet. Studier av tørråte, forårsaket av Phytophthora infestans, på riset, jorda og på knollene er en viktig del av dette prosjektet. Foreløpige resultater med sorten Folva viste at risdreping 14 dager før høsting reduserte antall sporer i riset og i jorda, og reduserte nivået av knollinfeksjoner sammenlignet med høsting på grønt ris med eller uten sprøyting med fluazinam (Shirlan) 7 dager før høsting. Sprøytingen med fluazinam reduserte imidlertid antall levende sporer i jorda ved høsting sammenlignet med ubehandlet grønt ris. Data fra forsøkene i prosjektet vil bli benyttet til å lage retningslinjer for vekstavslutning i potet blant annet ut fra tørråtesitasjonen i åkeren.
Forfattere
Helge Sjursen Arne Hermansen Elisa Gauslaa Ragnhild Nærstad Berit Nordskog Christer Magnusson Bonsak HammeraasSammendrag
Det er ikke registrert sammendrag
Sammendrag
Light inhibits sporulation of Bremia lactucae, and is a component of models for lettuce downy mildew infection periods, but specific intensities and wavelengths involved are poorly understood. We evaluated environmental data and model performance in Norway for two systems, PlantPlus (PP) and Modell-Analys (MA), which are based on a model developed in California. Disease was detected following forecasts issued by both models in 5 of 8 fields. However, forecasted infection periods were not always followed by disease occurrence. Both PP and MA usually called for fewer fungicide applications than a calendar schedule of sprays at 10-day intervals, with no difference in disease suppression among treatments. Date of initial disease varied widely among sites, and may be related, in part, to light intensity and quality at Nordic latitudes, which differ substantially from those of California. Results of subsequent studies on light effects on B. lactucae will be reported.
Sammendrag
Forebyggende og direkte tiltak mot salatbladskimmel blir beskrevet.