Reference photo — compare collapsed seedlings at the stem baseFungal & Oomycete · Plant health field guide
Seedling damping-off
Several soilborne organisms can weaken young stems at the growing-medium line and cause seedlings to collapse.
Act soonPossible cause—not a diagnosis. Compare the visible signs, plant identity, and growing conditions before treating.
Signs you may notice
- seedlings collapse
- pinched stem base
- soft stem
- patchy seedling loss
Safe first checks
- Separate affected seedlings, inspect the stem base, and review crowding, sanitation, moisture, and airflow.
- 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.
- underwatering
- heat injury
- mechanical damage
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.
Compare nearby possibilities
