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Stefan BlaserHello everybody, I hope somebody can help me with
Pestalotiopsis on Berberis?
Marc Detollenaere,
17-07-2023 21:01
Dear Forum,On leaves of Berberis julianae I found some small pycnidia with 2-coloured 4-septate conidia, 18-20.5x5-5.4µ. In some I also found 1-3 cilia at the top.
Pestalotiopsis seems a possibility but is not known from Berberis.
Any suggestions?
Thanks in advance
Marc
Chris Yeates,
20-07-2023 18:27
Re : Pestalotiopsis on Berberis?
Hello Marc
I suspect the material is a little old and appendages are often missing / hard to see? Have you considered Sarcostroma berberidis? See attachment
Best Wishes, Chris
Extracted-pages-from-Nag-Raj-1993-0001.pdf
Marc Detollenaere,
20-07-2023 23:22
Re : Pestalotiopsis on Berberis?
Thank you very much for your reply Chris.
I will have a closer look at Sarcostroma.
Marc
I will have a closer look at Sarcostroma.
Marc
Marcel Heyligen,
21-07-2023 23:16
Re : Pestalotiopsis on Berberis?
"Pestalotia" berberidis Guba (1961)
Pustules erumpent, 75-375x75-150 µm. Conidia 4-celled, 19-25x7.5-10 µm, median cells subglobose and olivaceous or clear umber, hyaline apical cell conic-cylindrical and crownded with (2-)3(-4-5) appendages 19-37 µm long, pecicel
coarse and rather long. On twigs of Berberis
Pustules erumpent, 75-375x75-150 µm. Conidia 4-celled, 19-25x7.5-10 µm, median cells subglobose and olivaceous or clear umber, hyaline apical cell conic-cylindrical and crownded with (2-)3(-4-5) appendages 19-37 µm long, pecicel
coarse and rather long. On twigs of Berberis
Bernard Declercq,
22-07-2023 18:28
Re : Pestalotiopsis on Berberis?
Hi Marc,
The conidia you show are typical for members of the Sporocadaceae. The species of this family are mostly not host specific.
The conidia of your collection have 1-3 apical appendages which are shorter than the conidium length and one small central, basal appendage. So, Sarcostroma should be excluded. Based on the key in annex Pestalotiopsis is the most appropriate genus and there Pestalotiopsis adusta seems to be the best match.
Best regards,
Bernard
The conidia you show are typical for members of the Sporocadaceae. The species of this family are mostly not host specific.
The conidia of your collection have 1-3 apical appendages which are shorter than the conidium length and one small central, basal appendage. So, Sarcostroma should be excluded. Based on the key in annex Pestalotiopsis is the most appropriate genus and there Pestalotiopsis adusta seems to be the best match.
Best regards,
Bernard
Chris Yeates,
22-07-2023 22:35
Re : Pestalotiopsis on Berberis?
Ah! For some reason I had not looked at image #1 or seen the multiple appendages. I think Bernard has made the best suggestion.
Chris
Marc Detollenaere,
23-07-2023 08:45
Re : Pestalotiopsis on Berberis?
Thx for the support Bernard, Marcel and Chris
Bernard, your new key makes the difference.
Marc
Bernard, your new key makes the difference.
Marc