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
Forfattere
Jan Netland Therese With Berge Kjell Wærnhus Kari AarekolSammendrag
Årets forsøk i kålrotprosjektet blei presentert på markdagen. Det var ca 60 deltakarar
Forfattere
Kjell WærnhusSammendrag
Det er ikke registrert sammendrag
Forfattere
Guro BrodalSammendrag
Det er ikke registrert sammendrag
Forfattere
Guro BrodalSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Guro BrodalSammendrag
Det er ikke registrert sammendrag
Forfattere
Guro BrodalSammendrag
Det er ikke registrert sammendrag
Sammendrag
In Norway, Nordmann fir (Abies nordmanniana) and subalpine fir (A. lasiocarpa) are the dominant Christmas tree species, and noble fir (A. procera) the dominant bough plant species. Several fungal shoot and foliage diseases may reduce their marketability. To determine if fungi found to cause diseases on fir in Norway might be seed borne, samples from twelve seed lots, including five Nordmann fir (from Austria, Georgia and Russia), four subalpine fir (from Canada and Norway) and three noble fir seed lots (from Norway) have been tested using agar plate methods (PDA and WA). The most important finding was that Sydowia polyspora was present on seed from all firs from all countries. Recently, it has been demonstrated in Norway that this fungus is the biotic cause of cause current season needle necrosis (CSNN), which is considered a major disease in the Christmas tree and bough production both in Europe and USA. Sirococcus conigenus, causing shoot blight of several conifer species, was found in a Norwegian A. procera seed lot (31% infected seeds), which to our knowledge is the first report of this pathogen on noble fir seed. Caloscypha fulgens, the seed or cold fungus, was recorded at low levels on subalpine fir from Canada. In addition 20 fungal genera and an unidentified fungus were recorded. Species within some of these genera are known pathogens in nurseries and production fields.
Sammendrag
In Norway, Nordmann fir (Abies nordmanniana) and subalpine fir (A. lasiocarpa) are the dominant Christmas tree species, and noble fir (A. procera) the dominant bough plant species. Several fungal shoot and foliage diseases may reduce their marketability. To determine if fungi found to cause diseases on fir in Norway might be seed borne, samples from twelve seed lots, including five Nordmann fir (from Austria, Georgia and Russia), four subalpine fir (from Canada and Norway) and three noble fir seed lots (from Norway) have been tested using agar plate methods (PDA and WA). The most important finding was that Sydowia polyspora was present on seed from all firs from all countries. Recently, it has been demonstrated in Norway that this fungus is the biotic cause of cause current season needle necrosis (CSNN), which is considered a major disease in the Christmas tree and bough production both in Europe and USA. Sirococcus conigenus, causing shoot blight of several conifer species, was found in a Norwegian A. procera seed lot (31% infected seeds), which to our knowledge is the first report of this pathogen on noble fir seed. Caloscypha fulgens, the seed or cold fungus, was recorded at low levels on subalpine fir from Canada. In addition 20 fungal genera and an unidentified fungus were recorded. Species within some of these genera are known pathogens in nurseries and production fields.
Sammendrag
Bipolaris sorokinana (teleomorph Cochliobolus sativus) is a widespread pathogen of cereals and many grasses. It can infect seeds, roots and leaves, causing seedling blight, common root rot, foot rot and spot blotch. Inoculum of B. sorokiniana may be seed-borne or arise from infected plant debris in the field and from conidia in the soil. Recent years the pathogen has occurred at high frequencies in seed lots of barley in Norway, especially in the cvs Edel and Annabell. A large proportion of the seed lots tested since 2004 were infected and the average infection frequencies were rather high. In order to evaluate the importance of the seed-borne inoculum in barley and to test the effect of seed treatment fungicides against the pathogen, field, greenhouse and laboratory experiments have been carried out with heavily infected barley seed. The infection level was reduced and plant weight, plant height, field emergence and yields were significantly increased by chemical treatment. The best effect was seen with an imazalil+flutriafol compound which increased the yield by approximately 35 % compared to untreated. A healthy untreated seed lot of the same cultivar included in one of the experiments showed approximately the same level of emergence and yield as the best fungicide treatment of a heavily infected seed lot. The investigations demonstrate that the use of healthy seed, or seed treated with an effective fungicide, is important to reduce the yield losses from B. sorokiniana.