Venturia inaequalis (Cooke) Winter, 1875
apple scab
on Malus, etc.
Sorbus torminalis, Hungary, Budapest, Hűvösvölgy, 29.iv.2018 © László Érsek
other leaf, underside
detail upper side
detail underside
Malus domestica, Belgium, prov. Limbourg, Kerkhoven, den Tip © arina Van Steenwinkel
leaf spot
conidia mass
conidia
conidia, 1000 x

Malus domestica, Dronten © Arnold Grosscurt

same leaf, underside
gall
During the summer leaf spots develop (also, as “scab” on the fruits) as a superficial mycelium where large masses of asexual conidia are formed. Sexual reproduction takes place in perithecia that are formed in spring on the overwintered fallen leaves. Conidiophores slender, smooth, annualate. Conidia solitary, olive brown, smooth, 7-10 x 14-23 µm, 0-1-septate.
host plants
Rosaceae, oligophagous
Amelanchier; Aronia x prunifolia; Cotoneaster integerrimus; Crataegus; Eriobotrya japonica; Malus baccata, domestica, x prunifolia, x purpurea, sylvestris; Photinia; Prunus; Pyracantha coccinea; Pyrus communis; Sorbus aria, aucuparia, domestica, intermedia, latifolia, torminalis.
synonyms
Fusicladium dendriticum (Wallroth) Fuckel, 1870; ; F. lalandi Marchal & Verplancke, 1926; F. pomi (Fries) Lind, 1913; Spilocaea pomi Fries; S. pyracanthae (Otth) von Arx, 1957.
references
Brandenburger (1985a: 256, 258), Buhr (1964b), Ellis & Ellis (1997a), Jage, Kruse, Kummer ao (2013a), Melgarejo Nárdiz, García-Jiménez, Jordá Gutiérrez ao (2010a), Roques, Cleary, Matsiakh & Eschem (2017a), Roskam (2009a), Ruszkiewicz-Michalska & Połeć (2006a), Schubert, Ritschel & Braun (2003a), Wilcox (1993a), Zhang, Crous, Schoch ao (2011a).