Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2011
Abstract
No abstract has been registered
Authors
Anna Maria Jönsson Susanne Harding Paal Krokene Holger Lange Åke Lindelöw Bjørn Økland Hans Peter Ravn Leif Martin SchroederAbstract
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.
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No abstract has been registered
Authors
Venche Talgø Leif Sundheim Halvor B. Gjærum Maria Herrero Aruppillai Suthaparan Brita Toppe Arne StensvandAbstract
This paper presents powdery mildew species recorded on woody ornamentals, with special emphasis on the latest arrivals; Erysiphe flexuosa on horse chestnut (Aesculus hippocastanum), Erysiphe syringae-japonicae on lilac (Syringa vulgaris) and Podosphaera spireae on white spirea (Spiraea betulifolia). The two former were found in 2006, while the latter was first detected in 2008. Chasmothecia (formerly named cleistothecia) were not found on white spirea until 2010. Several locations seemed to have optimal conditions for development of powdery mildew diseases in 2006. That year the long established Sawadaea bicornis on sycamore maple (Acer pseudoplatanus), was found for the first time on tatarian maple (Acer tataricum ssp. ginnala) and one cultivar from hedge maple (Acer campestre "Red Shine"). Also several species and cultivars of Rhododendron had massive attacks of powdery mildew in 2006. In 2010, chasmothecia of E. azaleae were found on severely affected R. "Magnifica" in western Norway. Most powdery mildew species are host specific, but especially Phyllactinia guttata has a wider host range, e.g. hazel (Corylus spp.) and common ash (Fraxinus excelsior).
Abstract
No abstract has been registered
Authors
Ermias Deribe Bjørn Olav Rosseland Reidar Borgstrøm Brit Salbu Zinabu Gebremariam Elias Dadebo Hans Ragnar Norli Ole Martin EkloAbstract
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Authors
Vladimir Shulaev DJ Sargent RN Crowhurst TC Mockler O Folkerts AL Delcher P Jaiswal K Mockaitis A Liston SP Mane P Burns TM Davis JP Slovin N Bassil RP Hellens C Evans T Harkins C Kodira B Desany OR Crasta RV Jensen AC Allan TP Michael JC Setubal JM Celton DJG Rees KP Williams SH Holt JJR Rojas M Chatterjee B Liu H Silva L Meisel A Adato SA Filichkin M Troggio R Viola TL Ashman H Wang P Dharmawardhana J Elser R Raja HD Priest DW Bryant SE Fox SA Givan LJ Wilhelm S Naithani A Christoffels DY Salama J Carter EL Girona A Zdepski WQ Wang RA Kerstetter W Schwab SS Korban Jahn Davik A Monfort B Denoyes-Rothan P Arus R Mittler B Flinn A Aharoni JL Bennetzen SL Salzberg AW Dickerman R Velasco M Borodovsky RE Veilleux Kevin M. FoltaAbstract
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Authors
Stig A. BorgvangAbstract
No abstract has been registered