Unknown infection on Trifolium repens

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adampembs
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Unknown infection on Trifolium repens

Post by adampembs » Mon Jul 06, 2015 12:00 pm

Growing on white clover in my garden.

I *did* see what looked like uredospores, but didn't photograph them and haven't been able to find them again. I think the fbs are mostly immature, but will try later. Fairly sure this is stage II and therefore can only be Uromyces trifolii-repentis but would appreciate any comments.
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Chris Yeates
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Re: Uromyces trifolii-repentis on Trifolium repens

Post by Chris Yeates » Mon Jul 06, 2015 2:00 pm

Hi Adam
There are several fungi which form leaf spots on clovers. I don't think this is a rust; my suspicion would be an early stage of the parasitic 'discomycete' Pseudopeziza trifolii see: http://www.ascofrance.com/search_recolte/2068
as you suggest some micro-shots would help.
Regards
Chris
"You must know it's right, the spore is on the wind tonight"
Steely Dan - "Rose Darling"

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adampembs
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Re: Uromyces trifolii-repentis on Trifolium repens

Post by adampembs » Mon Jul 06, 2015 9:27 pm

Thanks Chris. Looking at more samples, I am still struggling to find anything. Here are some macro shots and some micrographs. Are the red cells a discolouration or infection or both? :)
P1100600.JPG
Infected Trifolium repens leaf
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Trifolium repens leaf air mounted at x40 showing red dots
P1100607.JPG
Water mounted at x400
P1100606.JPG
Red dots air mounted at x100
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