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.
2007
Forfattere
May Bente Brurberg Arne Hermansen Abdelhameed Elameen Vinh Hong Le Björn Andersson Asko Hannukkala Bent J Nielsen Jens G Hansen Jonathan YuenSammendrag
Studies of genetic variation of the late blight pathogen among isolates collected in 2003 in the Nordic countries were presented
Forfattere
Matias Pasquali Kye-Yong Seong Jon Menke Erik Lysøe Karen Hilburn Yanhong Dong Jin-Rong Xu H. Corby KistlerSammendrag
To understand trichothecene accumulation and the infection cycle of the head blight pathogen F. graminearum sensu stricto, fungal gene expression profiles were monitored during germination of ascospores and during plant infection. A total of 328 genes were determined to be specifically expressed in ascospores. Among genes highly up-regulated in ascospores was one most closely related to FoStuA of F. oxysporum and StuA in Aspergillus. Mutants deleted for this gene in F. graminearum (FgStuA) are greatly decreased in sporulation and produce no perithecia. Unlike FoStuA mutants in F. oxysporum, FgStuA mutants are greatly reduced in pathogenicity. Reduced pathogenicity may be due to decreased le vels of trichothecene toxins, which in the mutant are
Sammendrag
Numerous fungicide applications are often needed to control powdery mildews in greenhouse-grown crops, and consequently there is an increasing demand for alternative means to control them. In commercial greenhouses, attack of powdery mildew caused by Podosphaera xanthii in cucumbers and P. pannosa in cut roses was controlled by weekly sprays of C-Pro CE601, a dilution of grapefruit seed extract (GSE). The raw material of GSE, delivered by Citricidalâ, is a glycerolic extract from seed and juiceless pulp of grapefruits (Citrus paradise). In both cultures C-Pro at 2000 ppm achieved as good control as treatments with penconazole or triforine. The mean level of attack by powdery mildew on leaves of cut roses one week after the last of three weekly treatments, was 9.8, 12.9 and 40.5 % for penconazole, C-Pro (2000 ppm), and untreated, respectively. In cucumbers, there was less difference between the untreated control and the different treatments, but for all times of assessments, C-Pro and triforine were better than untreated (P = 0.001). There was no significant difference in cucumber between C-Pro and triforine. Phytotoxicity symptoms like leaf twisting and rolling in roses (cv. Jade and Cezann) and dark green leaves and indications of growth retardation in cucumbers (cv. Ventura) were observed at the higher concentrations used (3000-4000 ppm). Thin layer chromatography of C-Pro CE601 has previously shown presence of benzethonium chloride, a synthetic antiseptic agent. Further research is necessary to determine if the observed effects of the product tested are due to natural compounds or if it is merely due to a synthetic preservative agent added. Our results revealed that C-Pro might be a supplement or even a replacement to some of the current fungicides used against powdery mildew.
Forfattere
Maria Herrero Brita Toppe May Bente BrurbergSammendrag
P. foetens ble funnet i 5 planteskoler. Det ble ikke funnet på stiklingene. P. begoniae ble funnet på symptomfri stiklinger. Phytophthora niederhauserii ble funnet i planter med lignende symptomer enn planter angrepet av F. fusarium
Forfattere
Maria Herrero Brita Toppe Trond RafossSammendrag
P.ramorum ble for første gang funnet i Norge i 2002 på Rhododendron catawiense. Mattilsynet gjenomførte en kartlegging i 2003-2006. Patogenet er utbredt i gartnerier i Sør-Norge, hovedsakelig på Rhododendron, men det har også vært påvist på Pieris japonica, Kalmia sp. og Syringa sp. Patogenet er også funnet på godt etablerte planter av Rhododendron og Viburnum i parker i Bergen og Stavanger. P.ramorum er videre funnet i importsendinger av Rhododendron og Viburnum.
Forfattere
Maria HerreroSammendrag
Oppsummering 2004-2006
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Model simulations show that an increased frequency in storms and drought periods may result in more frequent and shorter outbreaks of bark beetles. Warmer summers can result in two bark beetle generations per summer instead of one, giving bark beetles the opportunity to attack forests twice in a single year.
Sammendrag
Det er ikke registrert sammendrag