Onion Smut
Urocystis cepulae
Onionfungal
A seed- and soil-borne fungal disease that kills onion seedlings.
Symptoms
Dark, powdery streaks or blisters on cotyledons and young leaves, often killing seedlings.
Favorable conditions
- •Infested soil from previous onion smut outbreaks
- •Planting susceptible seed in infested fields
Management
- 1Use a seed-applied fungicide
- 2Rotate crops
- 3Avoid replanting onions in infested soil for several years
Back to the disease library