07-05-2024 00:04
Ethan CrensonA friend found these black gelatnous cups on a twi
06-05-2024 10:02
François BartholomeeusenGood morning,At the end of an excursion in De Zegg
05-05-2024 09:59
Gernot FriebesHello,I failed to identify this anamorph, which gr
19-04-2015 20:20
Enrique Rubio
Hi again Could you help me with this paper? NANN
30-04-2024 16:22
François BartholomeeusenDear forum members,On April 25 2024, I found one f
03-05-2024 18:04
Riet van Oosten
Hello, Found by Laurens van der Linde on Rubus fr
01-05-2024 23:22
Ethan CrensonHi all, Found late last week in a New York City p
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