Pseudomonas syringae pv. syringae
bacterial canker, blast, holcus spot
Many
Worldwide
Widespread
2022-12-01 19:52:31
bacterium
Thailand, China, Korea
Wide host range. Important vegetable and agronomic crops listed below.
PSDMSY
Seed is known to be a pathway on several crops. Thailand lists this pathogen as prohibited on corn. China lists this pathogen (Pseudomonas oryzicola) as prohibited on rice.
11 Known Hosts
Phaseolus vulgaris
common bean
Yes
PSDMSY-2,PSDMSY-8,PSDMSY-9,PSDMSY-11
Seed as a pathway is well established and accepted.
Yes
Seed wash and agar plating
Seed wash agar plating is the standard method of the NSHS.
PSDMSY-10
Seed certification is commonly used to reduce risk.
PSDMSY-1
International Seed Federation Regulated Pest List Database. pestlist.worldseed.org Nyon, Switzerland
Rich JJ, Willis DK, 1997. Multiple loci of Pseudomonas syringae pv. syringae are involved in pathogenicity on bean: restoration of one lesion-deficient mutant requires two tRNA genes. Journal of Bacteriology 179:2247-2258
Legard, D.E. and Schwartz, H.F. 1987. Sources and management of Pseudomonas syringae pv. phaseolicola and Pseudomonas syringae pv. syringae epiphytes on dry beans in Colorado. Phytopathology 77(11):1503-1509
Hall R, 1991. Compendium of Bean Diseases. St Paul, Minnesota, USA: APS Press
Mohan, S.K. and Schaad, N.W. 1987. An improved agar plating assay for detecting Pseudomonas syringae pv. syringae and P. s. pv. phaseolicola in contaminated bean seed. Phytopathology 77(10):1390-1395.
Pseudomonas syringae pv. syringae. In: Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc.
Zea mays
corn
No
PSDMSY-4
No evidence that seed is a pathway.
McGee, DC. 1988. Maize Diseases: A reference Source for Seed Technologists. APS Press, St. Paul, MN USA. 150 pp.
Triticum aestivum
wheat
No
PSDMSY-5,PSDMSY-13,PSDMSY-14,PSDMSY-19
Environmental sources and soil sources with early wet conditions contribute to disease outbreaks. Yield loss due to this pathogen is incomplete. The general role of seed or seed transmission in establishing disease is uncertain (PSDMSY-19)
Yes
Seed wash and agar plating
PSDMSY-19
Resistant varieties are known.
Wiese MV. 1991. Bacterial Leaf Blight, In, Compedium of Wheat Diseases, Eds. Wiese, M.V. APS Press, St. Paul, MN
Rashid AQMB, 1995. Detection of seed-borne Pseudomonas syringae pv. syringae in wheat. Plant Varieties & Seeds, 8:47-54
Otta JD, 1977. Occurrence and characteristics of isolates of Pseudomonas syringae on winter wheat. Phytopathology, 67:22-26
S. Asaad, D. C. Sands, and S. K. Mohan, 2017. CHAPTER 4: Detection of Pseudomonas syringae pv. syringae in Wheat Seeds. In, Detection of Plant-Pathogenic Bacteria in Seed and Other Planting Material, Second Edition Eds. M. Fatmi, R. R. Walcott, and N. W. Schaad. The American Phytopathological Society Press, St. Paul, MN
Pisum sativum
pea
No
PSDMSY-3,PSDMSY-20
Pathway not proven. PSDMSY-20 is the only reference found indicating that seed may be a pathway. No other references found indicating seed is s a pathway.
Oryza sativa
rice
No
PSDMSY-6,PSDMSY-7
Pathway not proven. Pseudomonas syringae pv. syringae has been isolated from rice grains but research was not done to show seed transmission. Seeds may become sterile if infected. No reports of this pathogen on rice in the US were found. This pathogen on rice is also known as P. oryzicola.
Visual examination.
PSDMSY-6
R. S. Zeigler and E. Alvarez. 1990. Characteristics of Pseudomonas spp. Causing Grain Discoloration and Sheath Rot of Rice, and Associated Pseudomonad Epiphytes. Plant Dis. 74: 917-922.
Ou, S.H., 1985. Rice Disease, Second Edition. Commonwealth Mycological Institiute, Great Britain
Allium cepa
onion
Not a host
PSDMSY-2
No references found indicating onion is a host for this bacterium.
International Seed Federation Regulated Pest List Database. pestlist.worldseed.org Nyon, Switzerland
Brassica oleracea vars.
cabbage, cauliflower, broccoli, brussel sprouts
No
PSDMSY-2
No references found indicating that Brassica oleracea are hosts for this pathogen.
International Seed Federation Regulated Pest List Database. pestlist.worldseed.org Nyon, Switzerland
Capsicum annuum
pepper
No
PSDMSY-2,PSDMSY-3,PSDMSY-16
No evidence that pepper seed is a pathway for this bacterium. Seed pathway has been speculated (PSDMSY-16) but no data was presented.
International Seed Federation Regulated Pest List Database. pestlist.worldseed.org Nyon, Switzerland
Richardson MJ, 1990. An Annotated List of Seed-borne Disease. International Seed Testing Association, Zurich, Switzerland
Buonarurio, R. and Scortichini, M. (1994). Pseudomonas syringae pv syringae on pepper seedlings in Italy. Plant Pathology, 43:216–219.
Cucumis sativus
cucumber
No
PSDMSY-2,PSDMSY-3,PSDMSY-17
No evidence found indicating seed is a pathway. Cucumber has only been shown to be a host under experimental conditions, but no references found indicating natural infection.
International Seed Federation Regulated Pest List Database. pestlist.worldseed.org Nyon, Switzerland
Richardson MJ, 1990. An Annotated List of Seed-borne Disease. International Seed Testing Association, Zurich, Switzerland
Slomnicka, R., Olczak-Woltman, H., Bartoszewski, G. and Niemirowicz-Szczytt, K. (2015). Genetic and pathogenic diversity of Pseudomonas syringae strains isolated from cucurbits. European Journal of Plant Pathology 141:1-14.
Lactuca sativa
lettuce
No
PSDMSY-2
No references found indicating lettuce is a host for this pathogen.
International Seed Federation Regulated Pest List Database. pestlist.worldseed.org Nyon, Switzerland
Hordeum vulgare
barley
No
PSDMSY-15,PSDMSY-18
Pathway not proven. Though the pathogen has been found on grain, no evidence of seed transmission was provided. The pathogen was found not to penetrate the seed coat..
Yes
Direct plating
PSDMSY-15
Mori, M., Sogou, K., and Inoue, Y., 2019. Development of a selective medium and antisera for Pseudomonas syringae pv. syringae from seeds of barley and wheat. Journal of General Plant Pathology, 85: 211-220.
Peters, RA and Timian, RG. 1981. A bacterial kernel blight caused by Pseudomonas syringae pv syringae. Phytopathology 81:1117 (abstr.)
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