Seifertia azaleae (Peck) Partridge & Morgan-Jones, 2002
Rhododendron ponticum, Belgium, prov. Limbourg, Beverlo, Einderse Beemden, 12.iii.2022 © Carina Van Steenwinkel
same leaf, underzijde
with a hand lense the synnemata (stiff bundles of hypha) are visible.
more strongly magnified
tip, with conidia
in older synnemata the conidia are formed in branching chains
Rhododendron ponticum, Ermelo, Kasteel Staverden © Hans Jonkman
The flower and leaf buds wither and finally die off. Their surface is covered by several mm high, erect, black “hairs”, in fact bundels of hyphae (“synnemata”) that apically bear a tuft of chains of conidia.
Rhododendron catawbiense, ponticum.
Found by Beenken & Senn-Irlet also on the native Rhododendron ferrugineum.
Pycnostysanus azaleae (Peck) Mason 1941.
Many indication suggest the the fungus penetrates the plant via wounds made the the cicada Graphocephala fennahi. This conspicuous, strikingly coloured insect is an invasive that relatively recently has been introduced into Europe. The female deposits her yellow, pear-shaped eggs in a semicircle under the epidermis.
Beenken & Senn-Irlet (2016a), Endrestøl (2017a), Ferracini, Gilardi & Alma (2003a), Kruse (2019a), Laister (2008a), Seifert, Hughes, Boulay & Louis-Seize (2007a), Špryňar (2005a), Termorshuizen (2004a).