Problem-specific reference photo
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Problem-specific reference photo under reviewunder review
Fungal & Oomycete · Plant health field guide
Surface mold on potting mix
Saprophytic fungi may grow on damp organic material without infecting the plant, but they often signal slow drying or limited airflow.
WatchPossible cause—not a diagnosis. Compare the visible signs, plant identity, and growing conditions before treating.
Signs you may notice
- white fuzzy soil
- mold on bark
- musty surface
- slow drying
Safe first checks
- Check whether growth is limited to dead material at the surface and inspect the living stem and roots separately.
- Separate the plant if the problem may spread.
- Remove only badly affected material with clean tools.
- Improve airflow and keep affected foliage dry while you compare the signs.
Can look similar to
Overlapping symptoms are common. Compare these alternatives before choosing a treatment.
- root mealybugs
- mineral residue
- stem rot
What to avoid
Do not assume every spot is infectious or use a disease-specific product without confirming the host and pattern.
Record and follow up
Photograph the same area in consistent light and note whether lesions enlarge, appear on new leaves, or stop after conditions improve.
Seek qualified local help when damage is severe, rapidly spreading, or may involve a regulated pest or disease.
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