Mealybug Infestation on Indoor Orange Tree: Identification and Treatment

The white, cottony growth spreading rapidly on your indoor orange tree is mealybugs—a common citrus pest. They can spread to nearby plants, so immediate action is essential.

Immediate Treatment: Rubbing Alcohol Spray

1. Fill a spray bottle with full-strength isopropyl (rubbing) alcohol.
2. Thoroughly spray all plant surfaces—leaves (top and bottom), stems, trunk, and soil surface.
3. Repeat twice weekly for 8–12 weeks to catch newly hatched crawlers from eggs.
4. Monitor closely after treatment ends for any resurgence.

Long-Term Solution: Systemic Insecticide

If the tree isn't currently blooming, apply a systemic insecticide for season-long protection:

• Product: Bayer Advanced 12 Month Tree & Shrub Protect & Feed (or equivalent imidacloprid-based systemic).
• Availability: Lowe's, Home Depot, Menards (call ahead in winter).
• Cost: ~$20 for a 32 oz concentrate.
• Application: Follow label directions for container-grown plants. The roots absorb the chemical, poisoning sap-feeding insects for up to a year.

Protect Your Plant Collection

Inspect all nearby plants immediately. Quarantine the orange tree if possible. Mealybugs spread easily on clothing, tools, and air currents.

With prompt, thorough treatment, your citrus can recover fully and stay pest-free.