Problem-specific reference photo
under review
Problem-specific reference photo under reviewunder review
Fungal & Oomycete · Plant health field guide
Phytophthora-like root or crown rot
Phytophthora water molds can cause serious root and crown disease.
Act soonPossible cause—not a diagnosis. Compare the visible signs, plant identity, and growing conditions before treating.
Signs you may notice
- crown rot
- root rot
- rapid wilt
- dark stem base
Safe first checks
- Isolate the plant, inspect the crown and roots, and seek confirmation before using disease-specific products.
- 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.
- pythium
- bacterial soft rot
- overwatering
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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