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Xanthomonas axonopodis pv. allii (bacterial blight )
Xanthomonas axonopodis pv. allii
bacterial blight
Xanthomonas campestris pv. alli
Japan, Brazil, Venezuela, parts of Africa, Cuba, Barbados
CA, CO, GA, HI, TX
2021-05-18
bacterium
Korea
onion, shallot, leek
XANTAA
1 Known Hosts
Allium cepa
onion
Yes
XANTAA-2, XANTAA-4
Seed is known to be a pathway.
Yes
Seed wash/liquid plating, Bio-PCR
Selective media and a BIO-PCR methods described. No validated or commercial seed assay available. PCR is an indirect way of testing (no isolation of the pathogen) and does not distinguish between viable and non-viable pathogen.
XANTAA-2, XANTAA-4, XANTAA-5
No seed treatments known to be effective
A quality systems approach in production of the seeds by crop inspections should reduce the chances of this organism being associated with the seed.
XANTAA-2
XANTAA-2
International Seed Federation Regulated Pest List Database. pestlist.worldseed.org Nyon Switzerland
XANTAA-4
Roumagnac, P., Gagnevin, L., and Pruvost, O. 2000. Detection of Xanthomonas sp., the causal agent of onion bacterial blight, in onion seeds using a newly developed semi-selective isolation medium. Eur. J. Plant Pathol. 106:867-877.
XANTAA-5
Robene-Soustrade, I., Legrand, D., Gagnevin, L., Chiroleu, F., Laurent, A. and Pruvost, O. 2010. Multiplex nested PCR for detection of Xanthomonas axonopodis pv. allii from onion seeds. Applied and Environmental Microbiology, 76:2697-2703.
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