Puccinia modiolae is a rust fungus that infects plants in the family Malpighiaceae, particularly species of Banisteriopsis and Hiptage. In East and Central Texas, it has been found on Banisteriopsis argyrophylla and other host species, typically causing yellow or orange spores to form on the underside of leaves. The fungus is often associated with moist, shaded areas and can be found in woodland edges, streamsides, and riparian zones throughout the region.
Blister-like pustules of rust fungus Puccinia modiolae on lower leaf surface of Carolina bristlemallow (Modiola caroliniana) on a lawn near apartments on George Bush Drive. College Station, Texas, March 11, 2019
Leaves of Carolina bristlemallow (Modiola caroliniana) with blister-like pustules of rust fungus Puccinia modiolae taken from a lawn near apartments on George Bush Drive. College Station, Texas, March 11, 2019
Blister-like pustules of rust fungus Puccinia modiolae on lower leaf surface of Carolina bristlemallow (Modiola caroliniana) taken from a lawn near apartments on George Bush Drive. College Station, Texas, March 13, 2019
Leaves of Carolina bristlemallow (Modiola caroliniana) with blister-like pustules of rust fungus Puccinia modiolae taken from a lawn near apartments on George Bush Drive. College Station, Texas, March 13, 2019
Blister-like pustules of rust fungus Puccinia modiolae on lower leaf surface and stem of Carolina bristlemallow (Modiola caroliniana) taken from a lawn near apartments on George Bush Drive. College Station, Texas, March 13, 2019
Blister-like pustules on underside and yellow-orange sunken spots on upper leaf surface of Carolina bristlemallow (Modiola caroliniana) caused by rust fungus Puccinia modiolae, taken from a lawn near apartments on George Bush Drive. College Station, Texas, March 13, 2019
Orange-brown bumps on underside of leaf of Carolina bristlemallow (Modiola caroliniana) caused by rust fungus Puccinia modiolae, taken from a lawn near apartments on George Bush Drive. College Station, Texas, March 13, 2019
Back lit leaf with blister-like pustules of rust fungus Puccinia modiolae on Carolina bristlemallow (Modiola caroliniana) taken from a lawn near apartments on George Bush Drive. College Station, Texas, March 13, 2019
Leaves of Carolina bristlemallow (Modiola caroliniana) with blister-like pustules of rust fungus Puccinia modiolae on a receding shore of Lake Conroe on Stubblefield section of Lone Star hiking trail north from Trailhead No. 6 in Sam Houston National Forest. Texas, February 16, 2020
Lone Star Hiking Trail, Montgomery, TX 77356, USA
Leaves of Carolina bristlemallow (Modiola caroliniana) with blister-like pustules of rust fungus Puccinia modiolae near Flag Pond on Lake Somerville Trailway near Nails Creek Unit of Somerville Lake State Park. Texas, March 10, 2021Lake Somerville Trailway, Ledbetter, TX 78946, USA
Blooming Carolina bristlemallow (Modiola caroliniana) with blister-like pustules of rust fungus Puccinia modiolae on a muddy shore of Flag Pond on Lake Somerville Trailway near Nails Creek Unit of Somerville Lake State Park. Texas, March 10, 2021Lake Somerville Trailway, Ledbetter, TX 78946, USA
Carolina bristlemallow (Modiola caroliniana) with blister-like pustules of rust fungus Puccinia modiolae on a shore of Flag Pond at Lake Somerville Trailway near Nails Creek Unit of Somerville Lake State Park. Texas, April 4, 2021Lake Somerville Trailway, Ledbetter, TX 78946, USA
Leaves of Carolina bristlemallow (Modiola caroliniana) with blister-like pustules of rust fungus Puccinia modiolae taken from Lick Creek Park. College Station, Texas, March 7, 2022
Spores of rust fungus Puccinia modiolae collected from Lick Creek Park. College Station, Texas, March 7, 2022
Spindle-shaped teliospores of rust fungus Puccinia modiolae at higher magnification collected from Lick Creek Park. College Station, Texas, March 7, 2022
Teliospores and urediniospores of rust fungus Puccinia modiolae at higher magnification collected from Lick Creek Park. College Station, Texas, March 7, 2022
Carolina bristlemallow (Modiola caroliniana) with blister-like pustules of rust fungus Puccinia modiolae in area of a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 6, 202323450 Farm-to-Market Road 1155, Washington, Texas 77880, United StatesObservations of the fungus Puccinia modiolae were made on Carolina bristlemallow (Modiola caroliniana) plants in East and Central Texas. The fungus formed blister-like pustules on the lower leaf surface, often accompanied by yellow-orange sunken spots on the upper surface. The pustules contained orange-brown bumps or spores, including teliospores and urediniospores. Infected plants were found in various locations, including lawns, lakeshores, hiking trails, and parks. The fungus was observed in College Station, Sam Houston National Forest, Somerville Lake State Park, Lick Creek Park, and Washington-on-the-Brazos State Historic Site. Observations were made over several years, from 2019 to 2023, with repeated sightings at some locations, indicating a persistent presence of the fungus in the region. The infected plants often showed no significant damage or defoliation, despite the presence of the fungus.
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