Lt70 from Saint Augustine, Florida writes
Monterey Horticultural Oil its not labeled specifically for sooty mold, but according to NC Extension article: "If one of the horticultural oils is used for control, it also has the advantage of helping to loosen sooty molds from the plant surface. This hastens the weathering away of the sooty molds." it will help with any insects on the plant.
Answer last updated on: 10/22/2021