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Sticky Leaves on Stephanotis? Identify and Treat the Pest Problem

Why Your Stephanotis Has a Sticky Residue

A sticky substance on the leaves, window, or floor beneath your Stephanotis (Madagascar jasmine) is a telltale sign of sap‑sucking insects. The residue—often called honeydew—is excreted by scale, mealybugs, or aphids. The hard white crust where the vine meets the trellis is likely dried honeydew.

How to Confirm the Culprit

Use a magnifying glass to inspect the undersides of leaves and stem joints. Look for:

  • Scale:
  • Mealybugs: White, cottony clusters in leaf axils.
  • Aphids: Tiny, soft‑bodied insects (green, black, or white) clustered on new growth.

Three Treatment Options

1. Alcohol Spray (Labor‑Intensive but Non‑Toxic)

Spray the entire plant with 70% isopropyl alcohol every 3 days for up to 6 months. Continue until no insects are seen for a full month. Thorough coverage is critical.

2. Systemic Insecticide (Bonide)

Apply a systemic granule or liquid (e.g., Bonide Systemic Houseplant Insect Control) to the soil once. The plant absorbs it, poisoning pests for 4–6 months. Follow label directions exactly.

3. Long‑Lasting Systemic (Bayer 12‑Month Tree & Shrub Protect & Feed)

This root‑absorbed product protects against scale, mealybugs, and other insects for a full year. Apply according to the bottle’s instructions for your pot size. Available at home‑improvement stores for ~$20.

Preventive Practices

  • Keep the plant in bright, indirect light (east window is ideal).
  • Water when the top inch of soil is dry; avoid standing water in the saucer.
  • Inspect regularly, especially when moving plants indoors/outdoors.

Whichever method you choose, early action prevents the infestation from spreading and keeps your Stephanotis healthy and blooming.

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