Shiny Hard Residue on Jasmine and Palm: Scale Insect Honeydew

A clear, hardened, shiny residue on leaves and surrounding surfaces—scratchable with a fingernail—is dried honeydew from scale insects. The insects themselves are small, oval, tan-to-brown discs attached to stems and leaf veins.

Identifying Scale

• Adults: 1/16–1/8 inch, immobile, shell-like covering.
• Juveniles (crawlers): Tiny, white, mobile—found in branch crotches.
• Honeydew: Sticky, sugary excretion that hardens into a clear film.

Control Indoors

1. Scrub adults off with an old toothbrush and mild soapy water.
2. Dab crawlers with 70% rubbing alcohol on a Q-tip.
3. Monitor weekly—natural predators absent indoors.

Outdoor Relief

Move plants outside in warm weather. Predators (lady beetles, parasitic wasps) will naturally suppress scale. Horticultural oil can be used if needed, but follow temperature limits to avoid leaf burn.