Gardenia Sooty Mold: Control Aphids, Wash Off Mold

Gardenia had scale and tiny white bugs (aphids). Leaves covered in black sooty mold. Sprayed with Ortho Volk Oil; mold now dry, flaky, wipes off. Asks if hose can remove it.

Cause and Cure

Black mold grows on honeydew from aphids/scale. Oil may not have fully controlled aphids. Hose off the mold—it’s harmless to the plant. If aphids persist, use systemic acephate (Orthene) for complete control. Mold will not return once insects are gone.