13-02-2026 18:05
Margot en Geert VullingsOn February 9, 2026, we found these small hairy di
14-02-2026 10:58
Bernard CLESSE
Bonjour à toutes et tous,Pourriez-vous m'aider Ã
13-02-2026 03:30
Tomaz Vucko
Hello! I found these immersed perithecia on a stic
12-02-2026 21:34
patrice CallardBonjour, la face inférieure des feuilles ce certa
11-02-2026 22:15
William Slosse
Today, February 11, 2026, we found the following R
12-02-2026 14:55
Thomas Læssøehttps://svampe.databasen.org/observations/10581810
11-02-2026 19:28
Lothar Krieglsteiner
on small deciduous twig on the ground in forest wi
25-04-2025 17:24
Stefan BlaserHi everybody, This collection was collected by JÃ
Sur bourgeon de Rhododendron. Je suis pratiquement certain qu'il s'agit de Pycnostysanus azaleae mais comme c'est la première fois que je le vois, je souhaiterais une confirmation.Conidies variables de forme : ellipsoïdes, subglobuleuses, citriformes, fusoïdes… : 5,5-11x5-5,5
Bernard
Dear Bernard,
your determination is correct. The species is quite common on cultivated Rhododendron and is transfered by the cicada Graphocephala fennahi (which is quite beautiful!).
Regards from Lothar
Thank you for your confirmation, to update the name of the fungus and the name of the cicada responsible for the appearance of the fungus!
Sincerely,
Bernard
Hello All,
Looks like this disease of Rhododendrons is spreading. It occurs regularly each year on a hybrid shrub in our garden in North Argyll, Scotland.
What is a puzzle, is what is the transmission agent as we are definitely not within range of Cicadas!
Kind regardes,
Peter
We're in range - Graphocephala fennahi (Graphocephala coccinea) is a leafhopper related to cicada's: http://scholar.lib.vt.edu/ejournals/JARS/v34n4/v34n4-wheeler.htm
And yes, a very distinctive looking beastie!
With regards,
Jenny