Synonyms: Aecidium compositarum, Aecidium petasitis, Aecidium tussilaginis, Pleomeris poarum, Puccinia conspicua, Puccinia petasiti, Puccinia petasitis.
Common name: Coltsfoot Gall Rust.
Extract from Wikipedia article: Puccinia poarum, the coltsfoot gall rust or meadow grass rust, is a plant pathogen. This fungal parasite forms a yellow to orange gall, 1–2 cm in diameter, on the underside of leaves of coltsfoot (Tussilago farfara). It also infects, but does not gall grasses of the family Poaceae. P. poarum is a genetically diverse species that has been reported on at least seventy plant hosts.
Persian: زنگ پای خر.
Puccinia poarum is a species of rust fungus that infects plants in the family Poaceae, particularly bluegrasses. In East and Central Texas, it has been found to commonly infect Kentucky bluegrass and annual bluegrass, causing disease symptoms such as yellow-orange spores on leaves and stems, and reducing plant vigor. The fungus is typically active during cooler and moist periods, with peak infection occurring in spring and fall. It is widely distributed throughout the region, with reports of its presence in counties including Travis, Williamson, and Brazos.
Orange-yellow rust fungus Puccinia poarum (Puccinia liatridis) on a leaf of gayfeather (Liatris) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Orange-yellow rust fungus Puccinia poarum (Puccinia liatridis) on basal leaves of gayfeather (Liatris) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Underside of basal leaves of gayfeather (Liatris) with orange-yellow rust fungus Puccinia poarum (Puccinia liatridis) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Close-up of orange-yellow rust fungus Puccinia poarum (Puccinia liatridis) on basal leaves of gayfeather (Liatris) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Basal leaves of gayfeather (Liatris) with orange-yellow rust fungus Puccinia poarum (Puccinia liatridis) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020Little Lake Creek Loop Trail, Montgomery, TX 77356, USAObservations of the fungus Puccinia poarum in East and Central Texas reveal its presence on gayfeather (Liatris) plants. The fungus appears as an orange-yellow rust on the leaves, specifically on the basal leaves. It was observed on Richards Loop Trail in Sam Houston National Forest on March 26, 2020. The rust fungus was visible on both the upper and underside of the leaves, with close-up views showing its detailed structure. Multiple observations were made, all confirming the presence of Puccinia poarum on gayfeather plants in this region. The consistent appearance of the fungus across different observations suggests it is a common occurrence on Liatris plants in East and Central Texas.
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