Sawadaea bicornis (Wallroth) Homma, 1937
on Acer
Acer campestre, Biddinghuizen, Spijk- en Bremerbergbos 4.ix.2018 © Hans Jonkman
Acer campestre, Nieuwendam: spring aspect, with conidia chains
Acer campestre, Nieuwendam, autumn: the mildew patches are situated at the underside of the green islands.
Acer campestre, Nieuwendam: macroconidia
cleistothecium
appendages
immature ascus
conidiophore
Acer pseudoplatanus, Belgium, prov. Antwerp, Meerhout © Carina Van Steenwinkel
released asci
appenages
ascus
Acer platanoides, Castricum
cleistothecium
stronger magnification
gall
Mycelium mostly hypophyllous, rather thin. Conidia formed in chains, variable in size (micro- and macro-conidia), with fibrosin bodies. Cleistothecia hypophyllous, with 35-100 short, stiff appendages, most of them forked once of twice, the tips with a small hook.
host plants
Sapindaceae, monophagous
Acer campestre, circinatum, ginnala, heldreichii, macrophyllum, monspessulanum, negundo, obtusatum, opalus, pensylvanicum, platanoides, pseudoplatanus, rubrum, saccharum, saccharinum, semenovii, sempervirens, tataricum.
Very common on Acer campestre. Occasionally on Aesculus hippocastanum.
synonyms
Uncinula aceris (de Candolle) Saccardo, 1882; U. bicornis (Wallrorth) Léveillé, 1851; Oidium aceris Rabenhorst, 1854.
references
Abras, Fassotte, Chandelier & Cavelier (2008a), Ale-Agha, Boyle, Braun ao (2008a), Blumer (1946a), Braun (1995a), Braun & Cook (2012a), Bresinsky (2016a), Czerniawska (2001a), Czerniawska, Madej, Adamska ao (2000a), Dynowska, Fiedorowicz & Kubiak (1999a), Ellis & Ellis (1997a), Jage, Klenke, Kruse ao (2016a), Jage, Klenke & Kummer (2010a), Jage, Kruse, Kummer ao (2013a), Jage, Scholler & Klenke (2010a), Klenke & Scholler (2015a), Korytnianska & Popova (2012a), Kruse (2014a, 2019a), Kruse & Jage (2014a), Leysen (2017a), Mieslerová, Sedlářová, Michutová, ao (2020b), Roques, Cleary, Matsiakh & Eschem (2017a), Ruszkiewicz-Michalska & Michalski (2005a), Scheuer & Bechter (2012a), Sucharzewska, Dynowska, Kubiak ao (2012b), Sulton (1996a), Talgø, Sundheim, Gjærum ao (2010a), Tóth (1994a), Unamuno (1943a).