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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

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).