Pecan seedlings with drying leaves : please help me!

Pecan    None Given

Hi there,
I'm from Italy and asked you some questions about pecan cultivation in the last year.
Now, I have a new question for you!
I have some pecan seedlings born about a month ago.
During the first day I noticed some black spots on them and I thought it could be scab (maybe infected nuts) so I treated them once with Tebuconazole and a second time with mancozeb (it is used yet in Italy).
I have a third light treatment and after 2 days some plants started to show black vein spots and day by day leaves started to turn brown and dry.
Last year I had the same problem and my seedlings died one by one but, as I remember,7 I didn't gave any treatment.
Someone told me it could be excess of water.
Last week I put them in a tall homemade pot and I noticed that the bad ones had a spiralized taproot.
According to you what's the problem and what can I do?
I put them for the first month in the shadow and now have them where they receive about 3-4 hours of early morning sun.
I don't know how to expose young pecan seedlings, can you help me about it?
Thank you!

Cheers from Italy!

Posted by: Mirko (1 point) Mirko
Posted: June 20, 2017


So, it could be a systemic infection by a fungus that was on the nut, but since you treated with two fungicides and still have the problem AND the damage is appearing from the edge and moving into the center then a suggestion to consider is that you have a physiological stress.
As you mentioned you the roots were bound which indicates the plant is stressed. The recommendation is to put them in a bigger pot with well drained soil

"If the taproot has become twisted at the base of the container, it should be
straightened or cut to encourage new taproot growth." From University of Georgia, https://secure.caes.uga.edu/extension...

Here are some good tips in the University of Florida http://edis.ifas.ufl.edu/hs229#FOOTNO...

When are you planning on putting these outside?
Is it single plant? What do the others look like?

Posted by: David Hughes (54 points) David Hughes
Posted: June 21, 2017

Mirko commented,
Thank you for your reply David!
They are outside.
My goal was to grew in pot and graft them.
One plant is in bad condition (the one in the pic) other two have the same problem but not so bad.

about 3 years ago.

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