Peace Lily Sticky Black Spots: Scale Insects, Not Fungus

Identification

Sticky black substance = honeydew from scale insects. Adults: tiny, oval, raised, translucent bumps hardening to brown shells on stems/leaf undersides. Hard to see.

Treatment Options (Non-Toxic)

• Brand X Foliage Cleaner (silicon-based, penetrates shells) – Southwest Plantscape Products, 800-333-7977.
• Rubbing alcohol spray: 1 part alcohol : 8–10 water + drop soap.
• Sun Spray Ultra Fine horticultural oil.
• Hot Pepper Wax (cayenne-based) – hotpepperwax.com.
• Neem oil (dilute with water + Pine Sol for odor).

Application Rules

• Drench all surfaces until dripping.
• Repeat in 5–7 days for crawlers.
• Weekly checks after.
• Never apply in direct sun or high heat.

Bloom Fix

No flowers = pot too large or light too low. Downsize pot, increase light.