Overwatering Causes Soil Pests and Fungus in Palm and Corn Plant

An indoor palm had white bugs, millipedes, and gnats in soil; a corn plant (Dracaena fragrans) had soil fungus. The owner also wanted cat deterrent tips.

Root Cause: Overwatering

All symptoms—gnats, larvae (millipedes/white bugs), fungus/mushrooms—stem from constantly wet soil. Roots rot, attracting pests and fungal growth.

Corrective Actions

• Palm: Water only when top 3 inches are bone-dry.
• Corn plant: Water only when pot feels very light.
• Immediate pest/fungus control: Spray soil surface with aerosol Lysol (fungus); spray insects with rubbing alcohol.
• Long-term: Drastically reduce watering frequency and volume.

Cat Deterrent

Sprinkle cayenne pepper on soil surface—cats avoid the scent/irritation.

Dry conditions solve the root problem; pests and fungus disappear naturally.