Managing Whitefly and Sooty Mold on Dwarf Plumeria: Persistent Horticultural Oil Treatment

Whitefly Control Requires Consistency

Whiteflies are tough because adults fly away when sprayed and return later. The sticky "goo" is sooty mold growing on their honeydew.

Strategy

Maintain a residue of horticultural oil on the leaves at all times. Spray weekly, covering undersides thoroughly. The oil deters landing and egg‑laying, and suffocates larvae. There is no quick fix—persistence wins.

Trim heavily infested branches first to reduce the population.