Fumaria fungus

Plant diseases
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markwilson
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Fumaria fungus

Post by markwilson » Wed Oct 05, 2016 3:33 pm

I think this might be Peronospora affinis on Fumaria muralis - Mark Wilson
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adampembs
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Re: Fumaria fungus

Post by adampembs » Wed Oct 05, 2016 9:10 pm

I think you need to see microscopic features to be sure about this. All I see are some discoloured, leaves, I'm afraid. I think a few things could cause that.
Adam Pollard
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Chris Yeates
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Re: Fumaria fungus

Post by Chris Yeates » Fri Oct 07, 2016 6:49 pm

I agree in general with Adam's pointing out that often spots/discoloured areas of leaves are not caused by fungi - or identifiable if they are fungal, without microscopy.
However in this case I strongly suspect you are correct. Of course, if we are being 100% accurate this isn't fungal either! The puckering of the leaves in those yellowed areas is a good pointer and I think the first photograph shows sporangia. With a x10 loupe if you bend a leaf in its potentially infected area, so you are looking along an edge, if you can see the tiny tree-like sporangia you know you have a downy mildew. Not easy to show in a normal photo though.
It's always a good idea, if you have a suspected infected plant of a PM, to pop it in a small sealable poly bag, breath a couple of times into the bag, exclude most air and put it in the fridge for a couple of days. The high relative humidity in the bag will encourage further sporangial production. This gives an idea of what more extensive attack looks like:
Peraffinis01.jpg
Peronospora affinis on Fumaria
hope that helps
Chris
"You must know it's right, the spore is on the wind tonight"
Steely Dan - "Rose Darling"

markwilson
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Re: Fumaria fungus

Post by markwilson » Sat Nov 26, 2016 9:10 am

Hi Chris

Only just seen your reply

Will have a go at encouraging the fungus if it is still there and I haven't been too good at weeding the garden

Thanks again

Mark

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