These symptoms resemble those of an unknown disorder or a possible disease with symptoms we refer to “mustard” leaf spot due to the characteristic yellowish spots on the leaf. The cause of these symptoms has yet to be identified. Similar symptoms have been reported in Zambia, Uganda, Kenya, Malawi, Brazil and USA. Further studies are needed to identify the causal organism and how to manage it.
Thank you Mr. Murithi!
I hope the information was helpful.