Mango diseases this season

Black bumpy spots on mango, can anybody tell me what disease is this, any natural solution

I read in internet: Mango leaf gall midge produces wart-like galls on leaves resulting in reduced photosynthesis, leading to leaf drop and lowered fruit production. Younger trees may die while older trees fail to recover normal growth after repeated attacks.
There are no examples of eradication of the insect anywhere in the world.

Thank god the gall midge disease is now in control, I sprayed panchagavya and sour butter milk in 10 days intervals, which one is worked I don’t know