20-08-2018 22:51
Mlcoch Patrik
Hi, I would like help with determination.Perithec
15-08-2018 21:56
Andgelo Mombert
Bonsoir à tous,Sur pétioles et nervures de feuil
17-08-2018 21:50
Georges GreiffHello, Today, on two Fraxineus trees about 100m a
16-08-2018 16:08
Blasco Rafael
Hola, he recogido esta muestra sobre tronco de Abi
15-08-2018 15:45
Gernot FriebesHi,we collected this Scutellinia a few days ago on
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