20-04-2015 22:14
Bernard CLESSE
Sur bourgeon de Rhododendron. Je suis pratiquement
19-04-2015 22:11
Bernard CLESSE
Bonsoir à tous,Trouvé il y a quelques jours ce c
19-04-2015 14:10
Steve ClementsHymenoscyphus? with mould on barkHi,This stalked d
19-04-2015 16:53
Alessandro FellinHiI am looking for the monograph of Donadini, spec
11-04-2015 15:25
Ralph Vandiest
Hello, I found this geopora in S'albufera (ES). A
08-04-2015 14:00
Stoykov Dimitar
Here are the photos of Plagiostoma salicellum (F.
19-04-2015 21:20
Marcel VegaHi,if anybody has one of the following articles I'
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