Mycosphaerella pyri (Auerswald) Boerema, 1970

on Pyrus

Pyrus communis Belgium, prov. Limbourg, Grote Brogel, 20.vii.2023 © Carina Van Steenwinkel

advanced infection

infected lead, upper side …

… underside

leaf spot with pycnidia of the Septoria stage. Pycnidia at both upper side and underside of the leaf.

squashed pycnidium with conidia.

conidia

conidia 3-4 x (40)50-74(82) µm, often obscurely 2-septate.

parasite

Leaf spots with pycnidia; also on the fruits. Conidia hyaline to greenish, 3-5 x 45-60 µm, 2-septate. Teleomorph pycnidia with 15-23 asci, 11-13 x 60-75 µm, spores 3-4 x 26-33 µm, on dried leaves.

host plants

Rosaceae, monophagous

Pyrus communis & subsp. pyraster, elaeagrifolia.

synonyms

Septoria pyricola Desmazières, 1850; S. piricola.

references

Bahçecioğlu, Kabaktepe & Yildiz (2006a), Brandenburger (1985a: 260), Chatzidimopoulos & Pappas (2016a), Ellis & Ellis (1997a), Jage, Kruse, Kummer, ao (2013a), Ludwig (1974a), Ruszkiewicz-Michalska (2006a.