Cottony Mass on Live Oak: Cottony Aphids, Not Woolly Aphids

White Fluff Under Live Oak Leaves

The cottony material is likely cottony aphids (or cottony cushion scale). Touch it—if it moves, it's insects. Sticky honeydew on leaves confirms sap-feeding.

Control Options

• Systemic soil drench: Imidacloprid (Bayer Advanced) – best for large trees, lasts months.
• Foliar sprays (contact): Acephate, bifenthrin, malathion, horticultural oil – require full canopy coverage, difficult on big oaks.

Systemic treatment is most practical for homeowners. Apply per label; honeydew and sooty mold will disappear once insects are controlled.