Spider Mites on Peace Lily — Early Detection on Large Smooth Leaves
Peace Lily (Spathiphyllum wallisii)
Symptoms
- stippled leaves
- bronze discoloration
- fine webbing
- dull leaf surface
- spider mites
Causes
Dry air, especially in winter
Peace lily's preference for humidity above 50% is actually protective against spider mites — but when the plant is placed in dry indoor air during the heating season, it becomes more vulnerable than usual to mite infestation. The combination of a plant stressed by low humidity and an environment favorable to mite reproduction creates elevated risk. Spider mites on peace lily are most common from November through March.
How to Fix It
- 1
Inspect the leaf undersides under bright light or with a hand lens. The large, smooth surface of peace lily leaves makes mite stippling very visible once you know to look for it — a bronze or silver, minutely pocked texture compared to the smooth, healthy leaf surface.
- 2
Take the plant to a shower. Peace lily's large leaves benefit from a thorough top-and-bottom spray with water, which removes large numbers of mites and their webbing physically.
- 3
Apply neem oil solution or insecticidal soap spray, ensuring complete coverage on both leaf surfaces since peace lily's broad blades make it easy to miss a strip near the midrib. Space treatments about a week apart and plan on three to four rounds before calling it resolved.
- 4
Increase humidity to above 50% to make conditions unfavorable for mite reproduction.
Prevention
- Maintain indoor humidity above 50% — the peace lily's own care needs protect it from mites
- Wipe large leaves monthly with a damp cloth — removes early mite populations and eggs
- Quarantine new plants before placing them near established specimens
Quick Summary
| Plant | Peace Lily (Spathiphyllum wallisii) |
|---|---|
| Category | Pests |
| Likely causes | Dry air, especially in winter |
| Fix steps | 4 steps — see above |