Tiny white flying insects on gardenia in Alabama are whiteflies—sap-suckers that weaken plants and excrete honeydew causing sooty mold. They congregate on leaf undersides and inside the canopy.
Treat with insecticidal soap, horticultural oil, or specific whitefly material (pyriproxyfen, bifenthrin). Spray thoroughly: inside the shrub, leaf undersides, stems. Repeat weekly for 3-4 weeks to break the life cycle. Yellow sticky traps monitor adults.
Whiteflies appear in spring warmth. They don't overwinter outdoors in central Alabama but migrate or come on new plants. Quarantine new purchases.
Healthy gardenias resist better: acidic soil, consistent moisture, morning sun, acid fertilizer.
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