Corn Plant Mealybug Infestation and Cultural Fixes

Titus's corn plant (Dracaena fragrans 'Massangeana') has dying lower leaves and white cottony spots—mealybugs.

Mealybug Treatment

Mix equal parts rubbing alcohol and water + 1 tbsp dish detergent per quart. Spray entire plant twice weekly for ≥2 months to kill adults and hatchlings. Eggs stay dormant; persistence is key.

Underlying Cultural Issues

Healthy plants resist pests. Likely stressors:

• Low light: Needs bright shadow-casting light most of the day.
• Overwatering: Must have drainage holes and tray. Water thoroughly, empty tray after 1 hour, then wait until soil surface dry ≥4 days (7-14 day interval; up to 21 days in winter).
• Tap water chemicals: Fluoride/chlorine cause brown spots. Use distilled water or let tap water sit 48 hours.

Summary

1. Treat mealybugs aggressively with alcohol spray.
2. Fix light, drainage, and water quality.
3. Plant will recover and resist future attacks.