Spider mites on triostar stromanthe
How do I get rid of spider mites?
On triostar stromanthe: Fine pale stippling on the upper leaf surface, and webbing once it is advanced. Rinse hard, then insecticidal soap weekly for a month. Dry air is what let them multiply.
Fine pale stippling on the upper leaf surface, as though someone dusted it with sand. Hold a sheet of white paper under a leaf and tap sharply — mites show as slow-moving specks. Fine webbing between leaf and stem means the population is already large.
Why this plant gets them
at a humidity floor of 55% it is often kept drier than it wants, and dry air is what lets mites go from invisible to webbing in a fortnight.
Drawn from this species' own record — humidity floor 55%, watering every 4–8 days, clumping habit. Full care entry.
The life cycle, and why one treatment fails
A generation completes in about a week in warm dry air, and a female lays a hundred eggs. That is why an infestation appears to arrive overnight: it did not, you saw it late.
What actually clears them
Rinse the plant hard in the shower first, undersides especially, which knocks off most of the population mechanically. Then insecticidal soap weekly for a month. Raising humidity around the plant genuinely helps, because mites breed far slower in humid air.
Wiping leaves with a damp cloth and stopping there. Misting, which raises humidity for minutes. And any single application, since eggs are unaffected by soap and hatch four days later.
What Missouri Botanical Garden records for this species
Mealybugs, root/stem rot and spider mites.
Missouri Botanical Garden Plant Finder — Stromanthe sanguinea. Checked 2026-09-12.
Other pests recorded for this species
- Fungus gnats monitor
Is it a pest at all?
Plenty of what looks like pest damage is a care problem. If you cannot actually find the insect described above, check the diagnosis pages for this species instead — brown crispy edges, curling leaves, yellow leaves — where the causes are ranked for this plant specifically.
Spider mites on other species here
58 other species in this database have spider mites recorded against them. The treatment is the same; only the reason they are prone differs.
- Swiss cheese plant Araceae
- Snake plant Asparagaceae
- Pothos Araceae
- Peace lily Araceae
- Spider plant Asparagaceae
- Fiddle leaf fig Moraceae
- Parlor palm Arecaceae
- Cast iron plant Asparagaceae
Sources
- Missouri Botanical Garden Plant Finder — Stromanthe sanguinea Pest and disease record for this species. Checked 2026-09-12.
- North Carolina Extension Gardener Plant Toolbox — Stromanthe sanguinea Extension pest guidance.
- Royal Botanic Gardens Kew, Plants of the World Online — Stromanthe sanguinea Accepted name and family. Checked 2026-09-12.
- This database's own care record for Stromanthe sanguinea — the humidity, watering and habit fields this page reasons from.
Compiled and edited by Tony Valcarcel · 2026-09-12
Treatment guidance is the standard approach for this pest and is not specific to
your plant's condition. If a plant is already collapsing, the pest may not be the
whole story. How this is sourced.