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.
2011
Forfattere
Paal Krokene Halvor Solheim Erik Christiansen Tao Zhao Jiang Hu Anna-Karin Borg-Karlson Niklas Björklund Bo LångströmSammendrag
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Sammendrag
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Sammendrag
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Forfattere
Anna Maria Jönsson Susanne Harding Paal Krokene Holger Lange Åke Lindelöw Bjørn Økland Hans Peter Ravn Leif Martin SchroederSammendrag
The Eurasian spruce bark beetle, Ips typographus, is one of the major forest insect pests in Europe, capable of mass-attacking and killing mature Norway spruce trees. The initiation and development of a new generation are strongly controlled by temperature and a warmer climate may affect the number of generations that is produced per year and hence the outbreak dynamics. Experimental knowledge regarding reproductive diapause adaptations is, however, too sparse for largescale assessments of future trends. We developed a model description of diapause induction, and used gridded observational temperature data to evaluate multiple combinations of day length and temperature thresholds to find the model parameterisation most coherent with I. typographus monitoring data from Scandinavia. The selected model parameterisation is supported by European literature data, though further experimental studies are required to analyse population specific adaptations and capacity for adjustments to changing climate conditions. Implementing the model description of reproductive diapause in a temperature driven model of bark beetle phenology (swarming activity and development from egg to mature bark beetle), enabled us to assess the length of the late summer swarming period that is a critical determinant of the risk of forest damage. By using regional climate model data we show that higher temperatures can result in increased frequency and length of late summer swarming events, producing a second generation in southern Scandinavia and a third generation in lowland parts of central Europe. Reproductive diapause will not prevent the occurrence of an additional generation per year, but the day length cues may restrict the length of the late summer swarming period.
Forfattere
Maria Herrero May Bente Brurberg Trond Rafoss Arild SlettenSammendrag
I 2010 ble det totalt analysert 112 prøver. Av disse mottok Bioforsk 74 merket "OK-program" og 38 uten henvisning til program. Patogenet ble påvist i 43 av prøvene. Av 2 analyserte importsendinger var 1 positiv. P.ramorum ble påvist i planteskoler og hagesentre i Sør-Norge. Det ble påvist hovedsakelig på rododendron, men på 4 lokaliteter ble det funnet på pyramidelyng (Pieris japonica). P. ramorum ble påvist også i parker og friområder på Vestlandet (Bergen og Stavanger-området). Det ble bare påvist på rododendron. De fleste prøver ble analysert med real-time PCR. Et mindre antall prøver ble analysert ved isolering på selektivt dyrkingsmedium
Forfattere
Maria HerreroSammendrag
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Sammendrag
The appearance of new problems caused by Phytophthora species has triggered a number of sanitary surveillances and surveys in nurseries, parks and ornamental production fields in Norway the last 8 years. As a result, several Phytophthora species and new hosts for already known species have been detected in Norway. On woody plants of ornamental value we have found: P. cactorum, P. citricola (plurivora), P. cambivora, P. citrophthora, P. gonopodyides, P. inundata-like, P. megasperma complex, P. ramorum and P. syringae. P. cinnamomi has been found in potted plants in nurseries and in greenhouses, but never in established plants. P. taxon Pgchlamydo was isolated from the soil and debris of an ornamental nursery. In fruit and berry production we have found: P. cactorum, P. cryptogea, P. fragariae, P. megasperma complex and P. rubi. Other Phytopthtora species, reported to cause damages on trees or scrubs, have been detected only in greenhouses in Norway: P. nicotianae, P. taxon niederhauserii and P. palmivora. Until the 2000s the identifications of Phytophthora species were made by morphological characters. In the last years we always combined morphology with molecular methods for identification (mainly ITS or cox sequencing).
Sammendrag
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Forfattere
Maria HerreroSammendrag
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Forfattere
Inger Martinussen Abdelhameed Elameen Håvard Eikemo Monica Skogen Jahn Davik S. Fitwi Sonja Klemsdal May Bente BrurbergSammendrag
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