walnut fungus

[markwilson]

Can anyone help with this on Walnut (Juglans regia) in West Somerset about a week ago. Thanks Mark

[Chris Yeates]

Hi

The only thing I can think of is an extreme form of http://www.zor.zut.edu.pl/Mycota/Marssonina%20juglandis.html” class=”bbcode_url”>http://www.zor.zut.edu.pl/Mycota/Marssonina%20juglandis.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” class=”bbcode_url”>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/walnut-leaf-gall-mite” class=”bbcode_url”>https://www.naturespot.org.uk/species/walnut-leaf-gall-mite

HTH

Chris

[markwilson]

[attachment=0]P1070594.JPG[/attachment]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/uk-and-ireland/view/observation/829173/walnut-fungus

but am not certain.

Thanks again for looking

Mark

[markwilson]

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

Mark

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