Black Deposit on Azalea Leaves

Question

My azaleas have developed black deposits on the leaves.

Answer 1

It is probably sooty mold. This article will help:
https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm

Sooty mold normally indicates a pest issue. You should check the plants for pests as well.