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.
1998
Forfattere
M. Bendz-Hellgren Katriina Lipponen Halvor Solheim Iben Margarethe ThomsenSammendrag
Det er ikke registrert sammendrag
Forfattere
Ricardo HolgadoSammendrag
Cereal cyst Nematodes Heterodera spp. are pests of cereal crops, and their occurrence is known for many years both in Europe and in Norway. This group of nematodes forms a complex of species referred to as the "Heterodera avenae-complex", this includes H.avenae Wollenweber (CCN), H. bifenestra Cooper, H. mani Matthews, H. iri Matthews, H. hordecalis Andersson, H. latipons Franklin and H. filipjevi Krall. The host status of cereal cultivars differs between and within different species of the H. avenae-complex, and several pathotypes occur in several species. The border lines for species and pathotypes of the Heterodera avenae-complex are diffuse. Several pathotypes of CCN are found in Europe, and two pathotypes Ha51 and Ha11 are reported from Norway, Symptoms of damage by cyst nematodes in cereals are usually shown as patches of pale and stunted plants. The effects on the aerial parts of plants are identical with symptoms of severe nitrogen and other mineral deficiencies. Plants attacked by the nematodes wilt readily in dry weather. This reflects the nematode damage to the root system. In our experience most modern commercial varieties of cereals are equally susceptible to CCN. The aim of the project is to study the occurrence and distribution of the species within H. avenae-complex, to clarify the pathotype spectrum and to investigate the possible occurrence of microbial antagonists in Norway. The project is expected to be completed in 2001.
Forfattere
Halvor Solheim E. BjøreSammendrag
Det er ikke registrert sammendrag
Forfattere
Ricardo Holgado Christer Magnusson Bonsak HammeraasSammendrag
Soil samples from a growth depression in potato (cv. Saturna) yielded large numbers of root lesion nematodes Pratylenchus penetrans. Growth was greatly reduced in the center of the patch, but improved gradually towards the margins. Transect-sampling showed plant growth to be negatively correlated with densities of P. penetrans. The nematode density in the central part of the patch was 900/250g of soil, compared to 49/250 g of soil in the margins, where plant growth seemed unaffected. Our data suggest a threshold for damage of 100-250 P. penetrans per 250 g of soil. P. penetrans was present in roots, underground stems, stolons and tubers. In tubers nematodes occurred in the outermost 0.5 mm of the tissue. Common scab (Streptomyces spp.) occurred frequently, and P. penetrans was also present in tubers with scab. The nematodes were found around and inside cross-fissure lesions considered typical of Streptomyces. Saturna has a relatively high degree of tolerance against common scab. The high frequency of scab, and close association of the nematodes with the symptoms could indicate an interaction. This study suggests that Norway may have a new problem in potato production. Our study confirms that P. penetrans survives storage of seed potatoes, from which new infestations develop. Hence, tubers do appear to be an important means for the spread of P. penetrans to new areas.
Forfattere
Øystein Johnsen Bjørn Langerud Tone Skretting Torild Wickstrøm Gro Wollebæk Gro BehrensSammendrag
Det er ikke registrert sammendrag
Forfattere
Helge Sjursen Arild AndersenSammendrag
Det er ikke registrert sammendrag
Forfattere
A Erstad Haldor Fykse Trond Hofsvang Leif SundheimSammendrag
Innføring om plantenes vekst og utvikling og oversikt over de viktigste skadene og skadegjørerne i jord- og hagebruksnæringen i Norge
Forfattere
Lita Greve Sverre KobroSammendrag
Det er ikke registrert sammendrag
Vitenskapelig – Presence of Phytphora fragariae var. fragariae in Norway
A. Stensvand, Maria Herrero
Forfattere
A. Stensvand Maria HerreroSammendrag
Det er ikke registrert sammendrag
Forfattere
Halvor SolheimSammendrag
Det er ikke registrert sammendrag