Venturia inaequalis (Cooke) Winter, 1875

apple scab

on Malus

Venturia inaequalis on Malus domestica leaf

Malus domestica, Belgium, prov. Limbourg, Kerkhoven, den Tip © arina Van Steenwinkel

Venturia inaequalis on Malus domestica leaf

leaf spot

Venturia inaequalis: conidia mass

conidia mass

Venturia inaequalis: conidia


Venturia inaequalis: conidia

conidia, 1000 x

Venturia inaequalis on Malus domestica

Malus domestica, Dronten © Arnold Grosscurt

Venturia inaequalis on Malus domestica

same leaf, underside


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.

host plants

Rosaceae, oligophagous

Malus baccata, domestica, x prunifolia, x purpurea, sylvestris; Sorbus aucuparia, latifolia.


Fusicladium dendriticum (Wallroth) Fuckel, 1870; Fusicladium pomi (Fries) Lind, 1913; Spilocaeca pomi Fries (anamorph).


Brandenburger (1985a: 256), 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), Wilcox (1993a), Zhang, Crous, Schoch ao (2011a).

mod 10.vii.2019