Erysiphe necator Schweinitz, 1834
on Cissus, Parthenocissus, Vitis

Vitis vinifera, Belgium, prov. Antwerp, Mol © Carina Van Steenwinkel

cleistothecium

appendages

detail

ascus

Vitis vinifera, Nieuwendam

underside of the leaf

cleistothecium

cleistothecium with asci

base of an appendage
gall
mycelium amphigenous, also on the fruits, mostly dispersed, almost persistent. Appressoria lobed or multilobed, single or paired. Conidia solitary, elliptic, without fibrosin bodies. Foot cell of conidiophore twisted once or twice. Cleistothecia with 4-8 asci, containing 4-6 spores. Appendages 10-30, equatorial, 1-6 x the diameter; they are stiff, brown over at least the basal part, with 4-9 septa; apex not enlarged, loosely or tightly circinate.
host plants
Vitaceae, oligophagous
Cissus alata, antarctica; Parthenocissus inserta, quinquefolia, tricuspidata; Vitis amuresis, vinifera.
synonyms
Uncinula necator (Schweinitz) Burrill, 1892; Oidium tuckeri Berkeley, 1847.
notes
In Europe the var. necator.
hyperparasites
references
Angeli, Pellegrini & Pertot (2009a), Beenken & Senn-Irlet (2016a), Braun (1995a), Braun & Cook (2012a), Braun, Cunnington, Brielmaier-Liebetanz, Ale-Agha & Heluta (2003a), Bresinsky (2016a), Hajjeh, Miazzi & Faretra (2008a), Jage, Klenke & Kummer (2010a), Jage, Kruse, Kummer ao (2013a), Klenke & Scholler (2015a), Kruse (2019a), Kruse & Jage (2014a), Leysen (2017a), Mieslerová, Sedlářová, Michutová, ao (2020b), Mułenko, Piątek, Wołczańska ao (2010a), Negrean & Anastasiu (2006a), Ruszkiewicz-Michalska & Michalski (2005a), Unamuno (1943a).