Pseudomonas syringae pv. lapsa
stalk rot
Chlorobacter lapsus, Phytomonas lapsa, Pseudomonas lapsa
Africa: Egypt, Nigeria; Asia: China, India, Iran, Pakistan; Europe: Germany; North America: USA
CA
2025-12-10
bacterium
Thailand
Main: sugarcane, sorghum, corn; Other: wheat
PSDMLP
Pseudomonas syringae pv.?lapsa is a bacterial pathogen of wheat that can cause leaf streak and black chaff. It is primarily spread via rain, irrigation water, crop residues, and plant-to-plant contact, while seed transmission is unproven.
Crops
Saccharum officinarum
sugarcane
No
No references found indicating sugarcane seed is a pathway.
2025-12-10 13:13:28
Sorghum bicolor
sorghum
No
No references found indicating sorghum seed is a pathway.
2025-12-10 13:13:43
Triticum aestivum
wheat
No
PSDMLP-1, PSDMLP-3, CABI CPC, PSDMLP-6, PSDMLP-7
Pseudomonas syringae pv. lapsa is considered uncertain as a seed pathway. Seeds may become discolored when infected, but available research has not demonstrated recovery of the bacteria from seed, nor that seed can reliably transmit the pathogen to seedlings or cause disease in the field. Occasional detections exist, but they are inconsistent and have not been linked to natural outbreaks.
Blotter Incubation
This method has been validated or standardized.
2025-12-10 13:28:04
McGee, DC. 1988. Maize Diseases: A reference Source for Seed Technologists. APS Press, St. Paul, MN USA. 150 pp.
Amanifar, N. 2019. First Report of Pseudomonas syringae pv. lapsa Causing Leaf Streak and Black Chaff of Winter Wheat in Southwest Iran, Plant Disease 104:276
Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc.
Bacterial leaf blight disease of wheat (Pseudomonas syringae pv. syringae) in Syria: importance, characterization, and spread.
Iličić, R., Scortichini, M., Bagi, F., Pavković, N., Jelušić, A., Đorđević, S., & Popović Milovanović, T. (2025). Pseudomonas syringae Population Recently Isolated from Winter Wheat in Serbia. Agriculture, 15(23), 2473.
Zea mays
corn
No
PSDMLP-1, PSDMLP-4, PSDMLP-5, CABI CPC, PSDMLP-8, PSDMLP-9
Pseudomonas syringae pv. ?lapsa is primarily a wheat pathogen; while it was historically detected on corn seed or stalks under artificial conditions, there is no recent evidence of natural infection or seedborne transmission in corn.
Yes
Blotter Incubation
This method has been validated or standardized.
2025-12-10 13:30:08
McGee, DC. 1988. Maize Diseases: A reference Source for Seed Technologists. APS Press, St. Paul, MN USA. 150 pp.
Ark, P.A., 1941. Persistance of Phytomonas lapsa on seed of field corn. Plant Dis. Rep. 25:202
Rangarajan and Chakravarti, 1967. A strain of Pseudomonas lapsa isolated from corn seed \s causing bacterial stock rot of corn in India. Plant Dis. Rep. 51:764-766
Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc.
Parkinson, N., Bryant, R., Bew, J. and Elphinstone, J., 2011. Rapid phylogenetic identification of members of the Pseudomonas syringae species complex using the rpoD locus. Plant Pathology, 60(2), pp.338-344.
Fernández-Sanz, A. M., Rodicio, M. R., & González, A. J. (2020). Phenotypic and genotypic analysis of Pseudomonas syringae recovered from symptomatic beans and associated weeds in Northern Spain. European Journal of Plant Pathology, 157(2), 377-387.
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