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.
2010
Sammendrag
The leaf blotch disease complex (LBD) frequently reduces yield of wheat in Norway. In visual assessments field symptoms can be difficult to attribute definitively to specific causal agents, and may be caused by any or all of the following three pathogens: Stagonospora nodorum (teleomorph: Phaeosphaeria nodorum) causing Stagonospora nodorum or glume blotch (SNB), Septoria tritici (teleomorph: Mycosphaerella graminicola) causing Septoria tritici or speckled leaf blotch (STB), and Drechslera tritici-repentis (teleomorph: Pyrenophora tritici-repentis) causing tan spot (DTR). There is no broad resistance to all three pathogens in commercially relevant wheat varieties. We analyzed 9 years of historical data on severity of LBD in the field and 36 years of historical data on post-harvest SNB infection of wheat kernels. Overall, correlation between leaf severity and seed severity over years was low (r=0.5). However, during the last 4 years correlations between SNB seed infection and severity of LBD increased (r=0.825). LBD severity varied signficantly with geographic location and increased exponentially on the last 3 leaves betweeen BBCH stage 70 and the last assessment at BBCH stage 89. An improved understanding of environmental and host developmental factors as they affect each member fo the LBD complex in the field will be essential to screening for quantitative and durable resistance to LBD.
Forfattere
Andrea FickeSammendrag
Det er ikke registrert sammendrag
Sammendrag
Utviklingen av LED-lamper til vekstbelysning er i full gang, og noen gartnere har allerede begynt å prøve ut lamper med en blanding av rødt og blått lys. For å samle praktisk erfaring med hvordan slike lamper kan påvirke skade- og nyttedyr utførte vi et forsøk i to veksthus med rosesortene "Ingrid Alexandra" og "Passion". Daglengden var 20 timer, og temperaturen var innstilt på 18-19oC med lufting på 23,0-23,5oC. Relativ luftfuktighet var innstilt på 79 %. Det var installert 150 W/m2 med SON-T-lamper (600 W) i veksthusene (150 µmol/m2/s i plantebestandet). Over 3 forsøksruter i hvert veksthus ble det i tillegg til SON-T-lampene hengt opp 2 LED-lamper med en blanding av 80 % rødt (620-630 nm) og 20 % blått (400-500 nm) lys (50-60 µmol/m2/s). Over 3 andre forsøksruter var det bare SON-T lamper. Resultatene viste at det ble fanget mer amerikansk blomstertrips på limfeller og i blomstene under LED-lampene, enn der det bare var SON-T-lampter. De voksne mellusene reagert motsatt av amerikansk blomstertrips, dvs. at det stort sett var mest veksthusmellus på limfellene i forsøksrutene med bare SON-T-lamper. Lampetype så ut til å ha liten effekt på rovmidd (Amblyseius swirskii).
Sammendrag
Leddormene (Annelida) består av gruppene flerbørstemark (Polychatea), fåbørstemark (Oligiochatea), igler (Hirudinea) og krogbærende pølseormer (Echinura).
Forfattere
Torkild Bakken Eivind Oug Svein Erik Sloreid Trond Bremnes Trond Knapp Haraldsen Dag DolmenSammendrag
Det er ikke registrert sammendrag
Sammendrag
The Nordic region is characterized by simple, non-bureaucratic exchange of forest genetic resources (FGR) between countries that is strongly associated with the everyman\"s right legislation within the individual countries. The regime for international exchange of FGR is smooth and regarded as being very valuable for the forestry sector across the Nordic country borders as it secures the unrestricted availability of seeds and breeding material.
Forfattere
Arne StensvandSammendrag
Det er ikke registrert sammendrag
Forfattere
Åsmund AsdalSammendrag
Det er ikke registrert sammendrag
Forfattere
Hans Haavardsholm Blom Louise LindblomSammendrag
Det er ikke registrert sammendrag
Sammendrag
Sturite et al. (2007) investigated growth and death of the major parts of white clover (Trifolium repens L. cv. "Snowy") plants in pure stand and in mixture with meadow fescue (Festuca pratensis L. cv. "Fure") in a combined plot and root window experiment in Norway (60°42"N, 10º51"E). Leaves, stolons and roots were tagged and their lifespan was monitored in harvested and non-harvested stands during two experimental years. The longevity of leaves and petioles ranged from 21 to 86 d (mean = 59 d). About 60% of the leaves produced during the growing season turned over before the autumn. Of the remaining leaves, 70-80 % were dead or had disappeared by the subsequent spring. The lifespan of sections of the main stolons ranged from 111 to over 677 d (mean = 411 d). In particular, stolon sections close to the parent fragment of undisturbed plants were long lived, while sections towards the terminal bud overwintered more poorly and had a much shorter lifespan. The longevity of roots was from 27 to 621 d (mean = 290 d) and was higher for roots appearing in spring and autumn than in summer. Harvesting significantly reduced the longevity of stolons and caused an increased fragmentation of the white clover plant but did not decrease leaf/petiole or root lifespan.