I have spotted the very easily identifiable Puccinia smyrnii on Alexanders in several varied locations and in May, as it got older, it looked like the third photo.
Then I then saw another rust on the same day, in the same crop of plants which had different characteristics, see other two photos. I read in Henderson's paper, that there is another fungus on Alexanders called Puccinia ljulinlca, but I cannot find any images on the internet to compare.
Are the latter 2 photos just another stage of Puccinia smyrnii or might it be the other rust?
Thanks in advance.
Alison
Rusts on Alexanders
- Chris Yeates
- Frequent user
- Posts: 764
- Joined: Tue May 26, 2015 7:01 pm
- Location: Huddersfield, West Yorkshire
Re: Rusts on Alexanders
Hi Alison
yes - two stages of the same rust fungus: the orange cluster-cup aecial stage (often effectively galling the leaves), and the chocolatey telial stage. The two stages often occur together - even in mild winters as here (the teliospores are splendidly ornamented):
Puccinia ljulinica is restricted to Smyrnium perfoliatum - I think I saw it on that host in Greece years ago; UK records here:
http://www.fieldmycology.net/FRDBI/FRDB ... +ljulinica .
Chris
yes - two stages of the same rust fungus: the orange cluster-cup aecial stage (often effectively galling the leaves), and the chocolatey telial stage. The two stages often occur together - even in mild winters as here (the teliospores are splendidly ornamented):
Puccinia ljulinica is restricted to Smyrnium perfoliatum - I think I saw it on that host in Greece years ago; UK records here:
http://www.fieldmycology.net/FRDBI/FRDB ... +ljulinica .
Chris
"You must know it's right, the spore is on the wind tonight"
Steely Dan - "Rose Darling"
Steely Dan - "Rose Darling"
Re: Rusts on Alexanders
Thanks Chris
Informative as ever with extras. Much appreciated.
Your records are immaculate. Are they stored somewhere for posterity?
Regards A
Informative as ever with extras. Much appreciated.
Your records are immaculate. Are they stored somewhere for posterity?
Regards A