walnut fungus

Plant diseases
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markwilson
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Posts: 95
Joined: Mon Jun 01, 2015 1:42 pm
Location: Crowcombe West Somerset

walnut fungus

Post by markwilson »

Can anyone help with this on Walnut (Juglans regia) in West Somerset about a week ago. Thanks Mark
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Chris Yeates
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Joined: Tue May 26, 2015 7:01 pm
Location: Yorkshire

Re: walnut fungus

Post by Chris Yeates »

Hi
The only thing I can think of is an extreme form of http://www.zor.zut.edu.pl/Mycota/Marsso ... andis.html. Those dark patches on the leaves could well be the same thing (updated names) Neomarssoniniella state of Ophiognomonia leptostyla see: http://www.ascofrance.com/search_recolte/3851 - click on thumbnail. With a x10 handlens you should be able to make out the raised spots on the dead patches, as shown in those photo's.

Something which is always worth looking out for on walnut is the very obvious mite galls of: https://www.naturespot.org.uk/species/w ... -gall-mite

HTH
Chris
"You must know it's right, the spore is on the wind tonight"
Steely Dan - "Rose Darling"
markwilson
Regular user
Posts: 95
Joined: Mon Jun 01, 2015 1:42 pm
Location: Crowcombe West Somerset

Re: walnut fungus

Post by markwilson »

P1070594.JPG
Thanks Chris

I will try and refind -if the rain and wind have not brought it down. I have attached another photo taken at the same time on the same tree.

Earlier in the year I think I found Microstroma juglandis on the same tree

https://www.ispotnature.org/communities ... nut-fungus

but am not certain.

Thanks again for looking

Mark
markwilson
Regular user
Posts: 95
Joined: Mon Jun 01, 2015 1:42 pm
Location: Crowcombe West Somerset

Re: walnut fungus

Post by markwilson »

PS Walnut Leaf Gall Mite - Aceria erinea was present in small numbers

Mark
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