Elsinoë australis affects the fruit and leaves of host plants and rarely the stems. Fruit and leaf lesions are dark in colour, round, flattened and smooth. On younger fruits it causes a deformation of rind, forming corky, round/irregular, protuberant lesions 2–6 mm. Leaf and twig lesions are initially funnel-shaped pockets, later scab-like, smooth, glossy, amphigenous, up to 2 mm diam. (Sivanesan & Critchett 1974, Wilson 2007).
It can be distinguished from Elsinoë fawcettii which has lighter lesions that are irregular in shape, are raised and rough and infect fruit, leaves and stems.
Ascomata globose, sometimes flattened or irregular, occasionally confluent, 40–120 µm in diam., buff, embedded in the tissues of the perfect stage, erumpent, consisting of a hyaline or slightly yellowish pseudoparenchyma devoid of a well defined epithecium. Asci often distributed in the upper part of the ascoma, globose to obclavate, inner wall thickened apically, 15–27 × 13–21 µm. Ascospores hyaline, variable, straight or more or less curved, 2–4 celled, often markedly constricted not only at median septum, but also at the other two, sometimes with a longitudinal septum in the upper middle cell, which is frequently slightly larger than the other cells, 12–20 × 4–8 µm. Conidial stage, Sphaceloma australis (Bitancourt & Jenkins 1936).