Synonyms: Dicaeoma oxalidis, Trichobasis oxalidis, Uredo oxalidis.
Common name: Oxalis rust.
Extract from Wikipedia article: Puccinia oxalidis is a fungus species in the genus Puccinia. This species is a causal agent of rust on plants in the genus Oxalis, such as Oxalis articulata. The disease appears as yellow dots on the reverse of the leaves. The aecial stage can be found on Berberis repens.
Puccinia oxalidis is a rust fungus that infects wood sorrel (Oxalis spp.). In East and Central Texas, it has been found to cause disease on various Oxalis species, producing orange to yellow spores on the underside of leaves. The fungus is typically active during the spring and fall, with optimal temperatures for infection ranging from 15°C to 25°C. It is widely distributed in the region, with reports from counties including Brazos, Grimes, and Travis.
Common yellow oxalis (Oxalis stricta) with sorrel rust fungus (Puccinia oxalidis) in wet area on Raccoon Run Trail in Lick Creek Park. College Station, Texas, March 22, 2019
Leaves of yellow oxalis (Oxalis stricta) with sorrel rust fungus (Puccinia oxalidis) in wet area on Raccoon Run Trail in Lick Creek Park. College Station, Texas, March 26, 2019
Common yellow oxalis (Oxalis stricta) with sorrel rust fungus (Puccinia oxalidis) in wet area on Raccoon Run Trail in Lick Creek Park. College Station, Texas, March 26, 2019
Sorrel rust fungus (Puccinia oxalidis) on yellow oxalis (Oxalis stricta) in wet area on Raccoon Run Trail in Lick Creek Park. College Station, Texas, March 26, 2019
Sorrel rust fungus (Puccinia oxalidis) on yellow oxalis (Oxalis stricta) in Bee Creek Park. College Station, Texas, March 29, 2022
Underside of leaves of wood sorrel Oxalis stricta with rust fungus Puccinia oxalidis in Bee Creek Park. College Station, Texas, March 29, 2022
Spores of sorrel rust fungus (Puccinia oxalidis) at low magnofication, collected in Bee Creek Park. College Station, Texas, March 29, 2022
Urediniospores of sorrel rust fungus (Puccinia oxalidis), collected in Bee Creek Park. College Station, Texas, March 29, 2022Observations of Puccinia oxalidis in East and Central Texas revealed the presence of the sorrel rust fungus on yellow oxalis (Oxalis stricta) in various locations. In Lick Creek Park, College Station, the fungus was found on common yellow oxalis in wet areas along Raccoon Run Trail on multiple dates in March 2019. Similarly, in Bee Creek Park, also in College Station, the fungus was observed on yellow oxalis and wood sorrel (Oxalis stricta) in March 2022. The underside of infected leaves showed signs of the rust fungus, and spores were collected and examined at low magnification, revealing urediniospores characteristic of Puccinia oxalidis. The repeated observations suggest that Puccinia oxalidis is present and active in these regions during the spring season, particularly in wet areas where yellow oxalis grows abundantly.
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