(Pseudomonas syringae pv. tagetis)
Conservation • Description • Hosts • Biology • Use • Distribution • Taxonomy
Conservation Status |
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IUCN Red List | not listed |
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NatureServe | not listed |
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Minnesota | not listed |
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Description |
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Outside of a laboratory, a bacterium is recognized only by the symptoms it produces in its host. Apical chlorosis of Canada thistle (Pst) (Pseudomonas syringae pv. tagetis) is a bacterium that infects some plants in the aster (Asteraceae) family. It produces the substance tagetitoxin, which blocks the production of chloroplasts, preventing photosynthesis. This results in whitened plant growth (chlorosis) on only the upper portion of the plant, stunted growth, fewer shoots, and inhibition of flowering. |
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Similar Species |
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Hosts |
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Plants in the Aster (Asteraceae) family, including Canada thistle, common dandelion, common sunflower, common ragweed, giant ragweed, and Jerusalem artichoke. |
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Biology |
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Season |
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Symptoms most noticeable from June to September |
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Use |
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Researchers at the University of Minnesota conducted a study in 2002 to assess the viability of using Pst as a biological control agent for Canada thistle. |
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Distribution |
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Sources |
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9/4/2020 | ||||
Occurrence |
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Common |
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Taxonomy |
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Phylum | Proteobacteria | ||
Class | Gammaproteobacteria | ||
Order |
Pseudomonadales | ||
Family |
Pseudomonadaceae | ||
Genus |
Pseudomonas | ||
Synonyms |
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Common Names |
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apical chlorosis of Canada thistle bacterial speck PST white‐colour disease of Canadian thistle (UK) |
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Slideshows |
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Visitor Videos |
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Share your video of this bacteria. |
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Other Videos |
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Visitor Sightings |
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Report a sighting of this bacteria. |
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MinnesotaSeasons.com Sightings |
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Avon Hills Forest SNA, North Unit Carver Highlands WMA, South Unit Charles A. Lindbergh State Park Lake Alexander Woods SNA, South Unit Mound Spring Prairie SNA, North Unit Minnesota Valley State Recreation Area, Lawrence Unit Northern Tallgrass Prairie NWR, Pavia Unit Northern Tallgrass Prairie NWR, Spieker Unit Sand Prairie Wildlife Management and Environmental Education Area |
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Created: 4/12/2018
Last Updated: