Synonyms: Albugo tragopogonis, Caeoma obtusatum, Cystopus cubicus, Cystopus tragopogonis, Pustula obtusata, Uredo candida, Uredo tragopogonis.
Common names: sunflower white rust, Goatsbeard white rust.
Extract from Wikipedia article: Pustula tragopogonis, the goatsbeard white rust, is an oomycete plant pathogen unrelated to fungal organisms.
Belarusian: Цыстопус казлабародавы.
Pustula tragopogonis is a species of fungus belonging to the Oomycota phylum. It infects plants in the Asteraceae family, causing white rust disease. In East and Central Texas, Pustula tragopogonis has been found on various host species, including salsify and western goat's beard, typically forming white blisters or pustules on leaves and stems. The fungus is often associated with moist environments and can be found in fields, meadows, and along roadsides.
Leaf of squaw-weed (Senecio ampullaceus) with sunflower white rust fungus Pustula tragopogonis (Pustula obtusata, Albugo tragopogonis)(?) on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 5, 2023
Burleson County, Texas, United States
Underside of a leaf of squaw-weed (Senecio ampullaceus) with sunflower white rust fungus Pustula tragopogonis (Pustula obtusata, Albugo tragopogonis)(?) on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 5, 2023Burleson County, Texas, United States
Spores (in KOH) of white rust fungus Pustula tragopogonis (Pustula obtusata, Albugo tragopogonis)(?) from a leaf of squaw-weed (Senecio ampullaceus), collected near Birch Creek Unit of Somerville Lake State Park. Texas, March 5, 2023
Leaves of squaw-weed (Senecio ampullaceus) with light yellow areas on leaves caused by sunflower white rust fungus Pustula tragopogonis (Pustula obtusata, Albugo tragopogonis)(?) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 6, 202323450 Farm-to-Market Road 1155, Washington, Texas 77880, United States
Squaw-weed (Senecio ampullaceus) with sunflower white rust fungus Pustula tragopogonis (Pustula obtusata, Albugo tragopogonis)(?) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 6, 202323450 Farm-to-Market Road 1155, Washington, Texas 77880, United States
Underside of a leaf of squaw-weed (Senecio ampullaceus) with sunflower white rust fungus Pustula tragopogonis (Pustula obtusata, Albugo tragopogonis)(?) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 6, 202323450 Farm-to-Market Road 1155, Washington, Texas 77880, United States
Spores an conidia(?) (in KOH) of sunflower white rust fungus Pustula tragopogonis (Pustula obtusata, Albugo tragopogonis)(?), collected from white powdery stuff with web from underside leaves of squaw-weed (Senecio ampullaceus) in Washington-on-the-Brazos a day before. Texas, March 7, 2023
Spores (in Melzer) of sunflower white rust fungus Pustula tragopogonis (Pustula obtusata, Albugo tragopogonis)(?) together with conidia of Alternaria leaf spot(?), collected from white powdery stuff with web from underside leaves of squaw-weed (Senecio ampullaceus) in Washington-on-the-Brazos a day before. Texas, March 7, 2023
Tissues (in Melzer) of sunflower white rust fungus Pustula tragopogonis (Pustula obtusata, Albugo tragopogonis)(?), collected from white powdery stuff with web from underside leaves of squaw-weed (Senecio ampullaceus) in Washington-on-the-Brazos a day before. Texas, March 7, 2023
Underside of leaves of squaw-weed (Senecio ampullaceus) with sunflower white rust fungus Pustula tragopogonis (Pustula obtusata, Albugo tragopogonis)(?) in Lick Creek Park. College Station, Texas, March 20, 2023Yaupon Loop Trail, College Station, Brazos County, Texas, United States
Close-up of underside of leaves of squaw-weed (Senecio ampullaceus) with sunflower white rust fungus Pustula tragopogonis (Pustula obtusata, Albugo tragopogonis)(?) in Lick Creek Park. College Station, Texas, March 20, 2023Yaupon Loop Trail, College Station, Brazos County, Texas, United States
Leaves of squaw-weed (Senecio ampullaceus) with sunflower white rust fungus Pustula tragopogonis (Pustula obtusata, Albugo tragopogonis)(?) on Yaupon Loop Trail in Lick Creek Park. College Station, Texas, February 17, 2024Yaupon Loop Trail, College Station, Brazos County, Texas, United States
Spores and tissues (at low magnification) of sunflower white rust fungus Pustula tragopogonis (Pustula obtusata, Albugo tragopogonis)(?) from white spots on leaves of squaw-weed (Senecio ampullaceus) collected on Yaupon Loop Trail in Lick Creek Park. College Station, Texas, February 17, 2024
Spores (in Congo Red) of sunflower white rust fungus Pustula tragopogonis (Pustula obtusata, Albugo tragopogonis)(?) from white spots on leaves of squaw-weed (Senecio ampullaceus) collected on Yaupon Loop Trail in Lick Creek Park. College Station, Texas, February 17, 2024
Spores (in lugol) of sunflower white rust fungus Pustula tragopogonis (Pustula obtusata, Albugo tragopogonis)(?) from white spots on leaves of squaw-weed (Senecio ampullaceus) collected on Yaupon Loop Trail in Lick Creek Park. College Station, Texas, February 17, 2024The fungus Pustula tragopogonis was observed on the leaves of squaw-weed (Senecio ampullaceus) in East and Central Texas. The infection caused light yellow areas on the leaves and white powdery spots on the underside of the leaves. Spores of the fungus were collected and examined under various stains, including KOH, Melzer, Congo Red, and lugol. The spores were found to be associated with conidia and other tissues of the fungus. Observations were made at multiple locations, including Somerville Lake State Park, Washington-on-the-Brazos State Historic Site, and Lick Creek Park, over a period of several months, from March 2023 to February 2024. The fungus was consistently found on squaw-weed plants, suggesting a specific host relationship.
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