Sawadaea bicornis (Wallroth) Homma, 1937

on Acer

Sawadaea bicornis on Acer campestre

Acer campestre, Biddinghuizen, Spijk- en Bremerbergbos 4.ix.2018 © Hans Jonkman

Sawadaea bicornis: conidia chains

Acer campestre, Nieuwendam: spring aspect, with conidia chains

Sawadaea bicornis: forming green islands in Acer campestre

Acer campestre, Nieuwendam, autumn: the mildew patches are situated at the underside of the green islands.

Sawadaea bicornis: macroconidia

Acer campestre, Nieuwendam: macroconidia

Sawadaea bicornis: cleistothecium

cleistothecium

Sawadaea bicornis: appendages

appendages

Sawadaea bicornis: immaturee ascus

immature ascus

Sawadaea bicornis: conidiophore

conidiophore

Sawadaea bicornis: cleistothecium

Acer pseudoplatanus, Belgium, prov. Antwerp, Meerhout © Carina Van Steenwinkel

Sawadaea bicornis: cleistothecium and asci

released asci

Sawadaea bicornis: appendages

appenages

Sawadaea bicornis: ascus

ascus

Sawadaea bicornis on Acer platanoides

Acer platanoides, Castricum

Sawadaea bicornis: cleistothecium

cleistothecium

Sawadaea bicornis: 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, 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), Kruse & Jage (2014a), Roques, Cleary, Matsiakh & Eschem (2017a), Scheuer & Bechter (2012a), Sucharzewska, Dynowska, Kubiak ao (2012b), Talgø, Sundheim, Gjærum ao (2010a), Tóth (1994a), Unamuno (1943a).

mod 19.vi.2019