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.
2017
Abstract
No abstract has been registered
Abstract
Nighttime ultraviolet (UV) radiation, if applied properly, has a significant potential for management of powdery mildews in many crop species. In this study, the role of growth light duration, irradiance, a combination of both (daily light integral) and light spectral quality (blue or red) on the efficacy of UV treatments against powdery mildew caused by Podosphaera xanthii and the growth performance of cucumber plants was studied in growth chambers. Increasing daily light integral provided by high-pressure sodium lamps (HPS) decreased efficacy of nighttime UV treatments against P. xanthii, but it increased plant growth. Furthermore, the efficacy of nighttime UV decreased when day length was increased from 16 to 20 h at a constant daily light integral. The efficacy of nighttime UV increased if red light was applied after UV treatment, showing the possibility of day length extension without reducing the effect of UV. Increasing the dose of blue light during daytime reduced the efficacy of nighttime UV in controlling the disease, whereas blue deficient growth light (< 6% of blue) caused UV mediated curling of young leaves. Furthermore, application of blue light after nighttime UV reduced its disease control efficacy. This showed the importance of maintaining a minimum of blue light in the growth light before nighttime UV treatment. Findings from this study showed that optimization of nighttime UV for management of powdery mildew is dependent on the spectral composition of the photosynthetically active radiation.
Abstract
Field trials of Abies lasiocarpa were undertaken with the aim of assessing the potential for Christmas tree production in Denmark. Twenty-six provenances originating from Alaska to New Mexico were tested. Damage by the insect Adelges piceae and the fungus Neonectria neomacrospora was recorded for the first time 8 and 12 years after the initial planting. Damage from N. neomacrospora increased rapidly in the period 12–15 years after planting. Trees from the northern provenances and humid climates exhibited less damage than those from southern ones. Previous attack by A. piceae had a minor effect on N. neomacrospora infection. Greenhouse tests showed that detached shoots from healthy Abies lasiocarpa can be used to rank provenances for resistance to N. neomacrospora, but results varied according to host subspecies.
Authors
Johanna Witzell Iryna Matsiakh Leopold Poljakovic-Pajnik Marc Kenis Venche Talgø Hans Peter Ravn Marek Barta Michelle ClearyAbstract
No abstract has been registered
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No abstract has been registered
Authors
Iryna Matsiakh Dimitrios N. Avtzis Kalev Adamson Sylvie Augustin Refika Ceyda Beram Thomas Cech Rein Drenkhan Natalia Kirichenko Giorgio Maresi Carmen Morales-Rodriguez Leopold Poljakovic-Pajnik Alain Roques Venche Talgø Anna Maria Vettraino Johanna WitzellAbstract
No abstract has been registered
Authors
Natalia Kirichenko Sylvie Augustin Ellie Barham Thomas Cech Rein Drenkhan Carmen Morales-Rodriguez Iryna Matsiakh Alain Roques Venche Talgø Anna Maria Vettraino Johanna WitzellAbstract
No abstract has been registered
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No abstract has been registered
Authors
Iryna Matsiakh Johanna Witzell Leopold Poljakovic-Pajnik Marc Kenis Venche Talgø Traian Manole Irina Ionescu-Malancus Marek BartaAbstract
No abstract has been registered
Authors
Magdalena Kacprzyk Iryna Matsiakh Dmitry L. Musolin Andrey V. Selikhovkin Yuri N. Baranchikov Daiva Burokiene Thomas Cech Venche Talgø Anna Maria Vettraino Andrea Vannini Simone ProsperoAbstract
No abstract has been registered