Plant Parasites of Europe

leafminers, galls and fungi

Erysiphe viburni

Erysiphe viburni Duby, 1830

on Viburnum


mycelium amphigenous, at the upper side of the leaf more or less persistent. Appressoria lobed or multilobed, paired or single. Conidia solitary, elliptic, without fibrosin bodies. Cleistothecia 75-130 µm, with 2-8 asci containing 4-8 spores. Appendages 4-22, equatorial, 1-1.5 x the diameter; they are stiff, extending, brown at the base, have 0-2 basal septa, the cell wall is rough; apically they are ± 4-5 times bifurcated in quick succession.

According to Klenke & Scholler conidia are formed only sparingly, and the cleistothecia are hypophyllous.

host plants

Adoxaceae, monophagous

Viburnum acerifolium, opulus, trilobum.


Microsphaera sparsa Howe, 1872; ? Golovinomyces sparsus auct. nec (Braun) Heluta, 1988.


Braun (1995a), Braun & Cook (2012a), Bresinsky (2016a), Jage, Klenke, Kruse ao (2016a), Jage, Klenke & Kummer (2010a), Jage, Kruse, Kummer ao (2013a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2014a, 2019a), Leysen (2017a), Scholler & Schubert (1993a).

Last modified 23.ix.2022