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.
2009
Forfattere
Venche TalgøSammendrag
Det er ikke registrert sammendrag
Forfattere
Venche TalgøSammendrag
Det er ikke registrert sammendrag
Sammendrag
New results are presented on taxonomic position, pathogenicity and control of the needle cast fungus Kabatina abietis, a species causing economic losses in Christmas tree production in various European countries as well as in Northeast USA. Trials with copper fungicides conducted in 2008 in Denmark, Norway, Germany, Austria and USA against Kabatina abietis were unsuccessful. Though the identity of Kabatina abietis with Sydowia polyspora as well as its pathogenicity was confirmed by a thesis in Norway, it remains unclear, whether the characteristic needle symptoms could be the result of different damaging agents.
Forfattere
Venche TalgøSammendrag
Det er ikke registrert sammendrag
Forfattere
Venche TalgøSammendrag
Det er ikke registrert sammendrag
Forfattere
Venche TalgøSammendrag
Det er ikke registrert sammendrag
Forfattere
Venche TalgøSammendrag
Det er ikke registrert sammendrag
Forfattere
Venche TalgøSammendrag
Det er ikke registrert sammendrag
Forfattere
David M. Gadoury Belachew Asalf M. Catherine Heidenreich Maria Luz Herrero Mary Jean Welser Robert C. Seem Anne Marte Tronsmo Arne StensvandSammendrag
A collection of clonal isolates of Podosphaera aphanis was heterothallic, and was composed of two mutually exclusive mating types. Cleistothecial initials approximately 30 µm were observed within 7 to 14 days after pairing of compatible isolates and developed into morphologically mature ascocarps within 4 weeks on both potted plants maintained in isolation and in field plantings in New York, USA and southern Norway. Ascospores progressed through a lengthy maturation process over winter, during which (i) the conspicuous epiplasm of the ascus was absorbed, (ii) the osmotic potential of the ascospore cytoplasm increased, resulting in bursting of prematurely-freed spores in water, and finally (iii) the development of physiologically mature, germinable, and infectious ascospores. Release of overwintered ascospores from field collections was coincident with renewed plant growth in spring. Overwintered cleistothecia readily dehisced when wetted, and released ascospores onto glass slides, detached strawberry leaves, and leaves of potted plants. Plant material so exposed to discharged ascospores developed macroscopically-visible mildew colonies within 7 to 10 days while non-inoculated controls remained mildew free. Scanning electron and light microscopy studies revealed that cleistothecia of P. aphanis were enmeshed within a dense mat of hyphae on the persistent leaves of field-grown strawberry plants, and were highly resistant to removal by rain while these leaves remained alive. In contrast, morphologically mature cleistothecia on leaves of 11 deciduous perennial plant species were readily detached by simulated rain and seemed adapted for passive dispersal by rain to other substrates. Contrary to many previous reports, cleistothecia appear to be a functional source of primary inoculum for strawberry powdery mildew. They furthermore differ substantially from cleistothecia of powdery mildews of many deciduous perennial plants in their propensity to remain attached to the persistent leaves of their host during the intercrop period.
Sammendrag
Gråskimmel (Botrytis cinerea) gir ofte store avlingstap i jordbær. Smitten må ein rekne med finst i alle jordbærfelt, og det er derfor uråd å unngå smitte heilt. Regntak eller plasttunnelar er sikraste tiltaket mot gråskimmel i økologisk jordbærdyrking. Det vernar plantene mot regn og doggfall, og tørrare planter gir mindre problem med gråskimmel.