Stemphylium vesicarium
onion leaf blight
Pleospora alli, Helminthosporium vesicarium, Macrosporium alliorum, Mystrosporium alliorum, Macrosporium parasiticum, Stemphylium parasiticum
Worldwide
CA, FL, MI, NY, TX, WA
2021-04-27 18:09:21
fungus
onion, leek, alfalfa, wheat, sunflower, pea, radish, tomato, parsley
PLEOAL
Ascospores (P. allii) and conidia (S. vesicarium) are mainly air-dispersed. This pathogen is often referred to as Pleospora alli in the literature
7 Known Hosts
Allium cepa
onion
Yes
PLEOAL-8,PLEOAL-10
Seed as a pathway is documented and accepted.
Yes
Agar Incubation
PLEOAL-10,PLEOAL-12
Seed treatments effective
PLEOAL-10,PLEOAL-12
Jakhar SS, Suhag LS, Duhan JC, 1994. Prevalence and incidence of Stemphylium blight of onion (Allium cepa L.) and its management through cultural practices. Crop Research (Hisar), 8(3):562-564 (See CABI)
International Seed Federation Regulated Pest List Database. www.pestlist.worldseed.org. Nyon, switzerland
Aveling, T.A.S., Snyman, H.G. and Naude, S.P. (1993). Evaluation of seed treatments for reducing Alternaria porri and Stemphylium vesicarium on onion seed. Plant Disease, 77, 1009-1011.
Medicago sativa
alfalfa
No
PLEOAL-9
Pathway not proven. Only one reference found indicating that seed may be a pathway. This pathogen has only been reported on alfalfa in South Africa and Australia.
Hot water and sodium hypochloride followed by thiram effectiveÂ
PLEOAL-9
Lamprecht SC, Knox-Davies PS, 1984. Stemphylium vesicarium on lucerne (Medicago sativa) seeds in South Africa. Phytophylactica, 16(3):189-19
Glycine max
soybean
No
No references found indicating seed is a pathway for this crop. Only one reference found indicating this is a host for the pathogen (PLEOAL-11)
Solanum lycopersicum
tomato
No
No references found indicating seed is a pathway for this crop.
Helianthus annuus
sunflower
No
No references found indicating seed is a pathway for this crop. Sunflower is not a primary host for this pathogen.
Petroselinum crispum
parsley
No
PLEOAL-2
Pathway not proven. Only found on artificially inoculated seeds. No reports of natural seed contamination.
Yes
Blotter incubation
PLEOAL-2
Removal or burial of plant debris through cultivation at the end of the season significantly reduced pathogen spores.
PLEOAL-8,PLEOAL-1,PLEOAL-12
Koike, S. T., O’Neill, N., Wolf, J., Van Berkum, P., and Daugovish, O. 2013. Stemphylium leaf spot of parsley in California caused by Stemphylium vesicarium . Plant Dis. 97:315-322.
Jakhar SS, Suhag LS, Duhan JC, 1994. Prevalence and incidence of Stemphylium blight of onion (Allium cepa L.) and its management through cultural practices. Crop Research (Hisar), 8(3):562-564 (See CABI)
Stemphylium vesicarium In: Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc. In:
Aveling, T.A.S., Snyman, H.G. and Naude, S.P. (1993). Evaluation of seed treatments for reducing Alternaria porri and Stemphylium vesicarium on onion seed. Plant Disease, 77, 1009-1011.
Raphanus sativus
radish
No
PLEOAL-3
Pathway not proven. Isolated from sprout radish seed. No references found indicating seed for planting is a pathway.
Yes
Blotter incubation
PLEOAL-3
A. Belisario, S. Vitale, and L. Luongo 2008, First Report of Stemphylium vesicarium as Causal Agent of Wilting and Root Rotting of Radish Sprouts in Italy. Plant Disease 92: 651
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