Diseases curry leaf plant.
My dad's curry leaf plant (Murraya koenigii) always develops this problem, I was looking at it this morning and decided to investigate.
There are tiny black spots on the underside of the leaves, they are mostly clustered. It doesn't really affect the plant growth, or the quality of the leaves. However, when we pick the leaves, they are quite difficult to wash off. they sort of just cling to the leaves. What are these unsightly black spot clusters, and are there any organic methods i can use to get rid of them?