Blisters/pustules on Hawkweed

Plant diseases
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alindsay
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Blisters/pustules on Hawkweed

Post by alindsay » Mon Jul 17, 2017 7:42 am

Well, I think it's the leaf of a Hawkweed, but definitely an Asteraceae, so could it be Albugo tragopogonis?

I would be grateful for an opinion.

Thanks in advance.
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on Asteraceae
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on Asteraceae

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Chris Yeates
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Re: Blisters/pustules on Hawkweed

Post by Chris Yeates » Wed Jul 19, 2017 3:03 pm

Hello Alison
One has to be careful that an invertebrate gall is not responsible in these cases. However, given the irregular sizes and shapes and the fact that I think I can see white spores and burst pustules I'm pretty certain this is indeed Pustula tragopogonis. See https://books.google.co.uk/books?id=j24 ... 22&f=false for explanation of new name. This species has also been called Pustula obtusata as on a Wikipedia page, but that name appears to be illegitimate following nomenclatural rules see: http://www.indexfungorum.org/names/Name ... dID=561187

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

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alindsay
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Re: Blisters/pustules on Hawkweed

Post by alindsay » Thu Jul 20, 2017 4:13 pm

Thanks Chris

I had ruled out insect activity, finding no larvae when opening the pustules and having studied the descriptions of likely galls in Redfern & Shirley's reference book.

Very useful & interesting information on the rust. I will go with Pustula tragopogonis.

Thanks again.

Regards Alison

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