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Botryotinia porri (botrytis rot of garlic )
Botryotinia porri
botrytis rot of garlic
Botrytis porri, Sclerotinia porri
Asia: China, Iran, Japan; Europe: Finland, Germany, Hungary, Norway, UK; North America: Canada, USA; Oceania: Australia, New Zealand; South America: Chile, Venezuela.
CA, NV, OR, WA
2025-08-01
fungus
Brazil, Mexico
Main: onion, leek; Other: garlic
BOTTPO
Botryotinia porri primarily spreads through wind- or rain-dispersed spores and survives in the soil, thriving in cool, moist climates. It may move via infected garlic bulbs or leeks, but seedborne transmission is unlikely. While it could spread to new areas, its impact is moderate, and establishment in tropical regions is unlikely.
1 Known Hosts
Allium cepa
onion
uncertain
BOTTPO-2, BOTTPO-3, BOTTPO-4, CABI CPC
Only one report of seed being a pathway for B. porri in onion (BOTTPO-2). No other references were found indicating onion seed as a pathway.
Yes
Blotter incubation
This test has not been validated or standardized.
BOTTPO-2
Cultural
Good hygiene will prevent the persistence of sclerotia or infected crop debris in the soil. Agricultural practices that would create cool moist conditions in the upper layers of the soil should be avoided, in particular in relation to irrigation.
CABI CPC
0000-00-00 00:00:00
BOTTPO-2
du Toit LJ, Derie ML, Hsiang T, Pelter GQ, 2002. Botrytis porri in onion seed crops and onion seed. Plant Disease, 86:1178.
BOTTPO-3
du Toit LJ, Derie ML, and Pelter, GQ 2004, Prevalence of Botrytis spp. in Onion Seed Crops in the Columbia Basin of Washington.Plant Disease 88: 1061-1068
BOTTPO-4
International Seed Federation Regulated Pest List Database. www.pestlist.worldseed.org. Nyon, switzerland
CABI CPC
Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc.
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