Collard plant has yellow brown leaves

Collard greens    Kenya

My collards have got a brownish yellow colour on older leaves. What could be the reason?

Posted by: Zackmatere (1 point) Zackmatere
Posted: May 22, 2017


some leaf parts look like black rot/leaf blight caused by Xanthomonas bacteria. Can you cut leaf petioles - black vessels are typical symptom for this disease?

Posted by: alex ignatov (33 points) alex ignatov
Posted: May 22, 2017

Agree with Alex, it could be black rot disease. To confirm the disease, we request you do some tests like
1. Look for discoloration (black) of the vascular tissue of leaf petiole.
2. Or you can do ooze test by cutting the infected leaves into small bits and put into water in a glass tube, if it is bacterial disease you will see the streaming of bacteria (image attached for your reference).

Posted by: Dr. Ravishankar Narayana (11 points) Dr. Ravishankar Narayana
Posted: May 22, 2017

Zackmatere commented,
Thanks alot for the advice whats the cause and the remedy
over 3 years ago.

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