New problems for my pecan plant?

Pecan    None Given

I'm from center Italy and I have two little grafted pecan plants of about 3 years old.
The Kiowa cultuvar plant has some strange black veins.
The main vain of some leaves blackened.
Someone can tell me what can it be?
The blue spots on the leaves are copper sprayed on nearby tomatoes plants.
I treated them with tebuconazole against scab because there are huge walnuts nearby, probably affected by scab.

Posted by: Mirko (1 point) Mirko
Posted: August 8, 2016

Mirko commented,
Probably it is the known scab or Gnomonia nerviseda as suggested by Dr. Ravishankar in another post. Can you confirm it?
almost 4 years ago.


Hi Mirko, It is very hard to diagnose the disease without seeing spores under microscope but according to your images it could be vein spot disease caused by Gnomonia nerviseda. It is mainly a foliar disease where the fungus attack vascular tissue at the junction of petiole to the rachis and base of rachis which results in blackening of veins and may cause early falling of leaves.

Posted by: Dr. Ravishankar Narayana (11 points) Dr. Ravishankar Narayana
Posted: August 9, 2016

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