Holly Sooty Mold and Leaf Drop: Insect-Driven Dual Symptom

John: large holly, red berries, bloomed spring. Now dropping leaves, yellow leaves. Remaining leaves: sticky blackish substance.

Expert Diagnosis

Steve: black rubs off = sooty mold (not disease). Grows on insect honeydew (shiny/sticky). Need insecticide. Leaf drop separate: established tree stress (cold snap?). Scratch twigs → green beneath = temporary drop.

Key Insight

Sooty mold confirms insect infestation above. Leaf drop may be unrelated stress. Dual diagnosis: treat insects for mold, assess stress for drop. Scratch test distinguishes temporary from fatal.