Direct Answer • Key Takeaway
Answer: You Are Probably Describing Sooty Mold Fungus. This Is a Minor Fungus That Grows on the Syrupy Excretions of Some Insects That Feed on Trees. the Fungus Does Little Physical Damage to the Tree Unless It Is So Severe That Leaves Coated with Sooty Mold Cannot Photosynthesize and Create Food for the Tree.
