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
Svein SkøienSammendrag
Det er ikke registrert sammendrag
Forfattere
Petter D. Jenssen Tore Krogstad Trond Mæhlum Kari H. Skjønsberg Guro Hensel Sven JonassonSammendrag
Det er ikke registrert sammendrag
Forfattere
Trond MæhlumSammendrag
Det er ikke registrert sammendrag
Forfattere
Ricardo Holgado Christer MagnussonSammendrag
In 1955 the potato cyst nematode (PCN) was recorded for the first time in Norway. This detection resulted in extensive surveys and measures were implemented based on the statutory regulation of 1916. The first statutory regulation for PCN was put in power in 1956, and later amended in several occasions. These regulations prohibit the introduction and spread of PCN with soil and plant materials. Early control strategies included the use of chemical fumigants and resistant potato cultivars in infested fields, and surveys detected new infestations which were placed under quarantine regulations. The recognition of G. rostochiensis and G. pallida, their pathotypes enabled a more precise use of resistant cultivars. Commercial chemical fumigants, organophosphates or carbamate nematicides have not been used in Norway since the early 1970s. Today, non-virulent G. rostochiensis is managed by crop rotation, while infestations by G. pallida or virulent G. rostochiensis results in at least 40-years ban for growing potato. Most Norwegian potato cultivars have the resistance genes, Gro-1 (H1) from Solanum tuberosum ssp. andigena. During the preceding decades great emphasis has been placed on documenting freedom from PCN in the production of certified seed potatoes, certified seed potato are used in combination with crop rotations using non-host crops, alternating susceptible and resistant cultivars. These are important control measures, but not easy to implement in Norway due to restricted acreage suitable for long rotations. The safe use of resistant potato cultivars requires a better knowledge on the presence of species and pathotypes in potato fields. In order to improve our information of the occurrence of PCN a new national survey program for the principal potato districts has started. These surveys will complemented by information generated from a new research project dealing with: studies of the virulence of selected PCN populations, decline rates of nematode field population densities and infection potential over time of populations from fields placed under quarantine regulations. studies on the occurrence and pathogenicity of microbial antagonistic parasitic on PCN, and their potential of future management of PCN, the safe use of early potato cultivars as a practical control method, and the potential for using Solanum sisymbriifolium as a trap crop, distinguish the degree of resistance of selected potato varieties available on the Norwegian market, and initial studies of the PCN-Potato-Pathosystem. These expected results of this project possibly will improve the management of PCN, and may alleviate present regulatory restrictions.
Forfattere
Ricardo HolgadoSammendrag
The correct identification to species and pathotype is of crucial importance for the kind management and regulations to be imposed in Norway as G. pallida and G. rostochiensis species are quarantine pests regulated in the national plant health legislation. Identification is in accordance with the EPPO diagnostic protocol. Morphology, Iso electric focousing and molecular methods are used. Today, non-virulent G. rostochiensis is managed by crop rotation, while infestations by G. pallida or virulent G. rostochiensis results in at least 40-years ban for growing potato.
Forfattere
Venche TalgøSammendrag
Det er ikke registrert sammendrag
Forfattere
Venche TalgøSammendrag
Phytophthora spp., powdery mildews, Neonectria sp. and others
Forfattere
R Nestby I Martinussen A Nes J RohloffSammendrag
Examination of European blueberry (EB) populations from different latitudes in Norway starting in 2008, have revealed results that indicate differences in growth, fruit yield and fruit quality. The examinations have been executed in subpopulations at latitudes 61, 64 and 69°N (respectively south, mid and north of Norway). Effects of fertilization, cutting of plants, climate etc have been examined in forest fields and on cultivated land. Plants have also been propagated and growth patterns have been examined under controlled conditions. Fruit samples from all locations have been analyzed for important biological components. This presentation will give an overview of some of the results obtained during the two first years of the project period.
Forfattere
R Nestby I Martinussen A Nes J RohloffSammendrag
Examination of European blueberry (EB) populations from different latitudes in Norway revealed differences in growth, fruit yield and fruit quality. Subpopulations from latitude 61, 64 and 69°N (respectively south, mid and north of Norway) showed different growth patterns when they were grown under similar conditions. The EB tended to grow longer shoots in 2009 at intermediate fertilization in half-cultivated forest fields fertilized in 2008 and 2009, while shoot number was not influenced by fertilization. Berry size and fruit yield in forest fields was not influenced by fertilization neither in 2008 nor in 2009. However, there were differences in yield between locations in both years and between soil conditions in 2008. Fertilized seedlings sawn in March 2008 and planted on farm land in July the same year, grew larger plants in 2009 compared with no fertilization, but developed no flowers. Content of sugar, anthocyanins, total phenols, and antioxidants was higher in Mid- and North - Norway compared to samples from the south in 2008 . Fruit quality parameters changed from early to late harvest in the ripening period (only samples from South Norway). Sugar content was highest at the early maturation stage, while anthocyanin levels were highest in the mid-harvest period and then declined. Antioxidant levels increased at later harvest dates, and data was clearly correlated with total phenol content but not with anthocyanins.
Sammendrag
In 2009, Phytophthora cambivora was isolated from a bleeding beech in Bergen and Ph. plurivora from one in Stavanger. Ph. cambivora has previously been found on noble fir (Abies procera) in Norway and Ph. plurivora on rhododendron (Rhododendron spp.). In Stavanger, Ph. plurivora was also isolated from Norway maple (Acer platanoides) standing adjacent to the infected beech.