My Lemon Tree Has Ulcer-like Bumps on Its Leaves

Question

My lemon tree has ulcer-like bumps on its leaves. What is the problem?

Answer 1

Depending on the bumps, it could be galls of some type. Here is more information: https://www.gardeningknowhow.com/plant-problems/environmental/treating-leaf-gall-on-plants.htm