Pseudomonas syringae pv. tabaci
wildfire
Bacterium angulatum, Bacterium tabaci, Chlorobacter angulatum, Chlorobacter tabaci, Phytomonas angulata, Phytomonas tabaci, Pseudomonas angulata, Pseudomonas tabaci
Worldwide
Widespread in eastern and southeastern states.
2025-09-05
bacterium
Thailand
Main: soybean, common bean, pea; Other: eggplant, oats, cowpea, potato
PSDMTA
Pseudomonas syringae pv. tabaci is a bacterial pathogen that causes wildfire disease in tobacco (Nicotiana tabacum). It produces small, water-soaked leaf spots surrounded by bright yellow halos, which can merge under humid conditions. The bacterium is mainly spread through water splash from rain or irrigation, contaminated tools or hands, and infected seed (in tobacco). It enters plants through wounds, with disease favored by cool, wet weather.
7 Known Hosts
Capsicum annuum
pepper
Not a host
PSDMTA-3
No references found indicating pepper seed is a host.
2025-09-05 10:12:19
Richardson MJ, 1990. An Annotated List of Seed-borne Disease. International Seed Testing Association, Zurich, Switzerland
Cucumis sativus
cucumber
Not a host
PSDMTA-3
No references found indicating cucumber seed is a host.
2025-09-05 10:15:37
Richardson MJ, 1990. An Annotated List of Seed-borne Disease. International Seed Testing Association, Zurich, Switzerland
Glycine max
soybean
uncertain
PSDMTA-3, PSDMTA-5, PSDMTA-6, CABI CPC, PSDMTA-7, PSDMTA-8
Reports of Pseudomonas syringae pv. tabaci on soybeans are limited and not widely verified. A few studies, primarily from Korea, have described wildfire-like symptoms and identified the pathogen, but these cases have not been consistently reproduced or confirmed in other regions. Major plant health references do not consistently list soybean as a host, and overall evidence remains scarce and unverified, leaving its status as a natural host uncertain.
No
Hot water treatment
Field management and pathogen free seed also suggested.
PSDMTA-1
2025-09-05 15:08:46
Richardson MJ, 1990. An Annotated List of Seed-borne Disease. International Seed Testing Association, Zurich, Switzerland
Graham JH, 1953. Overwintering of three bacterial pathogens of Soybean. Phytopathology, 43:189-192
Hartman, GL. 2015. Wildfire. In, Compendium of Soybean Diseases and Pests, Fifth Edition.eds. Hartman GL, Rupe JC, Sikora EJ, Domier LL, Davis JA and Steffey KL. APS Press, St. Paul MN, USA
Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc.
Myung, I. S., Kim, J. W., An, S. H., Lee, J. H., Kim, S. K., Lee, Y. K., Kim, W. G., 2009. Wildfire of soybean caused by Pseudomonas syringae pv. tabaci, a new disease in Korea. Plant Disease, 93(11) 1214.
Blancard, D. (2013, February 25). Tobacco – Biology and Epidemiology [Web page]. Ephytia. https://ephytia.inra.fr/en/C/10917/Tobacco-Biology-and-Epidemiology
Pseudomonas syringae pv. tabaci. In: Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc.
Phaseolus vulgaris
common bean
No
PSDMTA-4, RICH ISTA
One strain has been reported on P. vulgaris and its distribution is limited to Brazil. On P. vulgaris, the bacterium only attacks leaves and does not infect pods or seeds directly. There is no evidence that bean seed is a pathway for Pseudomonas syringae pv. tabaci.
2025-09-05 10:16:50
Pisum sativum
pea
No
PSDMTA-3
No references found indicating pea seed is a host.
2025-09-05 10:15:56
Richardson MJ, 1990. An Annotated List of Seed-borne Disease. International Seed Testing Association, Zurich, Switzerland
Solanum lycopersicum
tomato
No
PSDMTA-3
No references found indicating tomato seed is a host.
2025-09-05 10:16:14
Richardson MJ, 1990. An Annotated List of Seed-borne Disease. International Seed Testing Association, Zurich, Switzerland
Solanum melongena
eggplant
No
PSDMTA-3
No references found indicating seed is a pathway.
2025-09-05 14:34:13
Richardson MJ, 1990. An Annotated List of Seed-borne Disease. International Seed Testing Association, Zurich, Switzerland
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