Blue Boy/Girl holly hedge has mold on berries/leaves and aphids underneath. Expert: aphids suck sap, secrete honeydew → sooty mold. Two options: 1) Systemic insecticide spray covering both leaf sides (repeat needed). 2) Bayer Advanced Tree & Shrub Insect Control soil drench—roots uptake, kills aphids when they feed, lasts up to a year. Preferred for longevity. Available at nurseries. Link provided.
Treat the cause (aphids), mold disappears.
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