Hi from Italy!
I just asked about this problem on my cape fear little plant.
It is a 3 yo plant, planted in March 2016.
This year in June I found on the lower part of some leaves strange black spots and in July I noticed strange scorchings on them.
The problem did not stopped and leaves started to falm down in September.
Now, a lot of leaves fell down and I decided to have some analysis on them.
I thought it could be pbls due to xylella fastidiosa multiplex.
According to the plant patologist it is also a bacterial disease but it is due to Xantomonas Campestris, a bacterium that affects stone fruits.
Have you ever heard about it on pecans?
He told me to treat with copper salts after all leaves will fall.
By the way, I use on my plants bordeaux mixture, is it OK or are there other copper fungicide better than this against bacterial disease?
Thank you very much!
Ps: just found that xhantomonas campestris juglandis affects walnuts and its the cause of canker.
Yes, Xanthomonas arboricola (X. campestris) can affect many plants, including stonefruit, walnuts, etc. In Russia we have X. arboricola on sunflower, wheat, barley, cabbage, oilseed rape, and the strains are still virulet for walnuts
Posted by: alex ignatov
Posted: October 15, 2017