Dear Maria, these symptoms do not look like due to any nutritional disorder , to say the least..

Dear Maria Sosa

isolates of Cherry leaf roll virus, bacterial blight or canker, with different symptoms,or affected by humidity and temperature, you may do some test, inoculation and culture, will if it is bacterial or fungal diseases, and sometimes environment contamination

Brenneria nigrifluens: http://www.sisef.it/forest@/contents/?id=efor0640-007

’Marssonina juglandis’’: Brown spots on the leaves and the fruits get black. https://commons.wikimedia.org/wiki/File:Juglans_regia_007.jpg

https://commons.wikimedia.org/wiki/File:Juglans_regia_008.jpg

Gnomonia leptostyla on Juglans regia Buccaneer

https://commons.wikimedia.org/wiki/File:Gnomonia_leptostyla_on_Juglans_regia_Buccaneer.jpg

https://commons.wikimedia.org/wiki/File:Juglans_regia_007.jpg

https://en.wikipedia.org/wiki/List_of_Persian_walnut_diseases

http://extension.psu.edu/pests/plant-diseases/all-fact-sheets/plum-pox-virus-in-ornamentals

http://www.plantwise.org/KnowledgeBank/Datasheet.aspx?dsid=16077

https://www.researchgate.net/publication/31023763_Cherry_Leaf_Roll_Virus_in_Juglans_regia_in_the_United_Kingdom

Hoping this will be helpful

Regards

Prof. Houda Kawas

Article Cherry Leaf Roll Virus in Juglans regia in the United Kingdom

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Hi Dr.Maria Sosa

You can do a sample culture from the leaf and root on PDA  media to see any growth, maybe fungal pathogens as Phytophthora or  Bacterial infection

Good Luck

Laith

Laith , i agree with you , some kind of damping off symptoms , similar symptoms , we frequently observe in citrus as well..

Hello, I don’t know whether you mean Walnut blight, caused by Xanthomonas campestris. The symptoms appeared at the beginning of infection as small, water-soaked spots on immature fruit then darken and rapidly enlarge, lesions may formed on tree bark possibly extend into the pith causing cankers to form lesions on leaves. The latter look like brown with a green-yellow perimeter and the leaves  may coalesce to form large necrotic areas.

Hi María,

In my opinion this is not related to a biological problem. I have seen this symptoms in young walnut plants cultivated in small containers.

Maybe more information about nutrition and water quality might help to determine the cause of the symptoms.

Keep us informed if you get some more information about this.

Good luck!

Hello Maria , you must cultured the leaves of cherry on which symptoms appeared on suitable media in the lab. and then notice the organism grown. If any growth appears, you must test its pathogenecity . If the same symptoms appear , you can considered this  symptoms caused by living pathogen.

As I think its not caused by fungi . It may be caused by bad  nutrition .

Best regards 

Hi Dr.Maria Sosa

Are you know the cause of this symptoms?

Thank you

Dear Maria 

At first you should culture the symptomatic parts of leaves in the PDA medium and Nutrient agar medium. Then you will be able to confirm whether this disease caused by fungi or bacteria. Actually it may be caused by deficiency of nutrients.