Leaf spot on african violet
What are the spots on the leaves and how do I stop them?
On african violet: Discrete spots with defined edges, not browning creeping in from the margin. It needs water sitting on the leaf, so water the soil and never the foliage.
Discrete brown or black spots, often with a yellow halo or a darker ring, rather than browning that spreads in from the margin. Marginal browning is a watering or humidity problem; spots with defined edges are usually bacterial or fungal.
Why this plant gets them
it is watered from below for exactly this reason: water sitting on these leaves marks them and invites spotting.
Drawn from this species' own record — humidity floor 40%, watering every 5–10 days, rosette habit. Full care entry.
The life cycle, and why one treatment fails
It needs water sitting on the leaf to establish and spread. Every overhead watering and every misting session is an opportunity for it.
What actually clears them
Remove affected leaves. Water the soil rather than the plant, and never leave foliage wet overnight. Improve airflow. A copper-based fungicide helps if it keeps recurring after those changes.
Fungicide alone while still watering overhead. Also cutting out just the spot and leaving the leaf, which does nothing — the organism is already through that tissue.
Other pests recorded for this species
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 — no flowers, root rot — where the causes are ranked for this plant specifically.
Sources
- North Carolina Extension Gardener Plant Toolbox — Streptocarpus ionanthus Extension pest guidance.
- Royal Botanic Gardens Kew, Plants of the World Online — Streptocarpus ionanthus Accepted name and family. Checked 2026-09-11.
- This database's own care record for Streptocarpus ionanthus — 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.