Sticky Black Spots on Succulents Are Not the Real Problem
Sticky black spots on succulents are honeydew and sooty mold, not the real problem. Find the scale, mealybugs, or aphids first, then clean the leaf.
Sooty Mold & Secondary Fungal Issues
Treat sooty mold and secondary fungal growth that follows pest honeydew or prolonged leaf wetness.
Why Are Your Succulent's Leaves Sticky and Turning Black?
Sticky leaves that turn black are honeydew plus sooty mold sitting on the surface, not rot. Wash it off, then find the insect still feeding above it.