| Onion smut |
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| Urocystic cepulae |
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Plant hosts
- Major hosts: Allium (onions, garlic, leek, etc.), Allium cepa (onion), Allium porrum (leek)
- Minor hosts: Allium sativum (garlic)
- Wild hosts: Antirrhinum (snapdragon)
To view larger image click on picture.
Image provided by Dan Rahn, United States.
Means of movement and dispersal
Plant parts liable to carry the pest in trade and transport:
- Bulbs, tubers, corms, and rhizomes: spores and hyphae are born internally and externally. Spores and hyphae are visible to naked eye.
- Leaves: spores and hyphae are born internally and externally. Spores and hyphae are visible to naked eye.
- Stems: spores and hyphae are born internally and externally. Spores and hyphae are visible to naked eye.
Plant parts not known to carry the pest in trade and transport:
- Bark.
- Fruits.
- Flowers.
- Seedlings and micropropagated plants.
- Root.
- Seeds.
- Wood.
Symptoms
The disease appears in the plant stem as it emerges. Infected areas have a raised, blisterlike appearance near ground level. Blisters rupture to expose black powdery spore masses. Many seedlings die during emergence. Those that live produce distorted bulbs with darkish streaks and numerous smutty regions.
Return to plant pathogen list .
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