Puccinia allii

Plant diseases
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Steve
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Puccinia allii

Post by Steve » Mon Aug 31, 2015 10:32 am

Hi,
We had a look in Longshaw Kitchen Garden, a joy to any allotmenteer - organic and productive. We spotted half a dozen rusts and mildews. Chives - Allium schoenoprasum - had this rust. Is it Puccinia allii or Uromyces amgiguus?
Urediniospores are finely verrucose, up to about 30 across, teliospores are approx 20 broad, and up to 75 long.
From the descriptions there isn't a specially good match for the spores in Ellis & Ellis, they are rather variable I suppose. P.allii has telia "blackish brown, long covered by the grey epidermis". U. ambiguus has "uredinia covered by yellow epidermis". Both could fit my specimens. However, only P.alli has 1-septate teliospores, so I reckon that's what I have.
Steve
Attachments
Uredinia top, changing to telia bottom
Uredinia top, changing to telia bottom
Close-ups showing covering of epidermis. Teliospore bottom right.
Close-ups showing covering of epidermis. Teliospore bottom right.
Urediniospores
Urediniospores
Teliospores
Teliospores

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Chris Yeates
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Re: Puccinia allii

Post by Chris Yeates » Mon Aug 31, 2015 3:46 pm

You've answered your own question - yes it's a Puccinia. It could well be argued that the two genera - separated simply on whether the teliospores are one or two-celled - should be united. You can find the odd 1-celled teliospore in collections of Puccinia spp. and I have seen a 2-celled teliospore in a Uromyces collection (by a weird coincidence in Uromyces ambiguus!)
Uroamb.jpg
But I think commonsense has meant that the two genera - already extremely large ones are best kept apart. If they were united then Puccinia Pers. 1794 would have precedence over Uromyces (Link) Unger 1833.

best wishes
Chris
"You must know it's right, the spore is on the wind tonight"
Steely Dan - "Rose Darling"

Steve
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Location: Sheffield, Yorkshire

Re: Puccinia allii

Post by Steve » Mon Aug 31, 2015 7:31 pm

Many thanks once again Chris,
Best wishes,
Steve

bojan
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Re: Puccinia allii

Post by bojan » Wed Apr 14, 2021 7:41 pm

Hello!
I found Puccinium allii on Allium scorodoprasum. Is the determination correct?
Thanks.

Bojan
Attachments
PUCCINIUM ALLI.jpg
PUCCINIUM ALLII (2).jpg
PUCCINIUM ALLII (3).jpg
PUCCINIUM ALLII (4).jpg

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Chris Yeates
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Re: Puccinia allii

Post by Chris Yeates » Thu Apr 15, 2021 4:57 pm

bojan wrote: Wed Apr 14, 2021 7:41 pm Hello!
I found Puccinium allii on Allium scorodoprasum. Is the determination correct?
Thanks.

Bojan
Hi Bojan
The answer is "Yes" as long as you accept the broad species concept which includes "Uromyces ambiguus" within Puccinia allii. The situation is put well here:
https://bladmineerders.nl/parasites/fun ... nia-allii/
Note particularly the comments at the bottom.
Regards
Chris
"You must know it's right, the spore is on the wind tonight"
Steely Dan - "Rose Darling"

bojan
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Re: Puccinia allii

Post by bojan » Thu Apr 15, 2021 5:37 pm

Thanks !

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