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Problem-specific reference photo
under review

Problem-specific reference photo under review

Fungal & Oomycete · Plant health field guide

Pythium-like root rot

Pythium water molds can damage roots in persistently wet conditions.

Act soonPossible cause—not a diagnosis. Compare the visible signs, plant identity, and growing conditions before treating.

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Signs you may notice

soft roots
stunting
wilting in wet medium

Safe first checks

Check living root tips and drainage; species-level confirmation requires testing.
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.

phytophthora
overwatering root stress
rhizoctonia

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.