Lemon tree

Question

My lemon tree and my ornamental orange tree both have bumpy leaves – like little lumps growing from inside.
What is the cause of this as I have sprayed with oleum about 4 weeks ago but it does not seem to have helped yet.

Thank you

Kind regards
Jenny

Answer 1

This sounds like what is called Citrus Canker. A very bad bacterial infection. This article will help you to identify the problem, and offer ways to solve the issue: https://www.gardeningknowhow.com/edible/fruits/lemons/common-lemon-tree-diseases.htm