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Mot de passe perdu? S'inscrire

14-05-2024 21:43

Tubercularia vulgaris ?
Thierry Blondelle Thierry Blondelle

Bonjour,A côté de Hystérographium fraxini, ces

14-05-2024 09:19

Presentation about Orbilia
Hans-Otto Baral Hans-Otto Baral

Hi, I want to announce for next Sunday 17.00 middl

14-05-2024 19:48

Possible Hymenoscyphus menthae
B Shelbourne B Shelbourne

• Hymenoscyphus: Habitat, macro, spores, paraphy

14-05-2024 09:50

On Populus
Yannick Mourgues Yannick Mourgues

Hi. Found on decorticated wod of Populus cf. alba

13-05-2024 12:48

Apiosporous pyrenomycete
Eduard Osieck

After eight years (*) I found the same apiosporous

11-05-2024 18:08

Possible Mollisia nervicola
B Shelbourne B Shelbourne

• Mollisia on tree leaves: On dead Quercus leave

12-05-2024 11:48

Hypoderma (?) sur Euphorbia hyberna
Michel Hairaud Michel Hairaud

Bonjour , Voici une récolte d'une Rhytismataceae

10-05-2024 17:40

Nitschkia, no! It's a lichen
Anna Klos

Good afternoon, Thursday during an inventory we f

11-05-2024 00:33

asco possibly Encoelia-like, reviving after drying out and rehydrating
Ethan Crenson

I'm not entirely sure that Encoelia-like is the ri

11-05-2024 10:09

Leptostroma pdf?
Luc Bailly Luc Bailly

Hello all, Does anyone have access to this? Thyr

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Pycnostysanus azaleae sur Rhododendron
Bernard CLESSE, 20-04-2015 22:14
Bernard CLESSESur 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
  • message #35333
  • message #35333
  • message #35333
  • message #35333
Lothar Krieglsteiner, 20-04-2015 22:32
Lothar Krieglsteiner
Seifertia azaleae ist correct

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

Bernard CLESSE, 21-04-2015 08:13
Bernard CLESSE
Re : Pycnostysanus azaleae sur Rhododendron
Dear 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

Peter Wilberforce, 21-04-2015 12:40
Re : Pycnostysanus azaleae sur Rhododendron

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

Jenny Seawright, 21-04-2015 17:04
Jenny Seawright
Re : Pycnostysanus azaleae sur Rhododendron
Hello 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