Synonyms: Aecidium nitens, Caeoma nitens, Kunkelia nitens, Uredo nitens.
Common name: orange berry rust.
Extract from Wikipedia article: Gymnoconia nitens is a species of rust fungus in the Phragmidiaceae family. It is a plant pathogen, and causes orange rust on various berries. The species was originally described in 1822 by mycologist Lewis David de Schweinitz as Aecidium luminatum.
Gymnoconia nitens is a rust fungus that infects plants in the genus Rosa, causing disease in rose species. In East and Central Texas, it has been found to commonly infect wild roses, particularly Rosa foliolosa and Rosa setigera, as well as cultivated rose varieties. The fungus produces yellow to orange spores on the underside of leaves, often accompanied by chlorotic or necrotic lesions on the upper leaf surface. It is typically found in areas with high humidity and warm temperatures, and its presence has been documented in various counties across East and Central Texas, including Brazos, Grimes, and Williamson counties.
Orange Berry Rust fungus Gymnoconia nitens on blackberry, with purple spots to the right caused by asexual stage of Helicobasidium purpureum (violet root rot, Tuberculina persicina), in Falls on the Brazos Park. Marlin, Texas, March 16, 2018
644 FM 712, Marlin, TX 76661, USA
Orange Berry Rust fungus Gymnoconia nitens on shoots of blackberry in Falls on the Brazos Park. Marlin, Texas, March 16, 2018644 FM 712, Marlin, TX 76661, USA
Orange Berry Rust fungus Gymnoconia nitens on a leaf of blackberry in Falls on the Brazos Park. Marlin, Texas, March 16, 2018644 FM 712, Marlin, TX 76661, USA
Blooming blackberry damaged by orange berry rust fungus (Gymnoconia nitens) in Bastrop State Park. Bastrop, Texas, March 17, 2018194 Pine Hill Loop, Bastrop, TX 78602, USA
Blooming blackberry with orange berry rust fungus (Gymnoconia nitens) in Bastrop State Park. Bastrop, Texas, March 17, 2018Lost Pines Trail, Bastrop County, Texas, 78602, United States
Orange berry rust fungus (Gymnoconia nitens) on shoots of blackberry in Bastrop State Park. Bastrop, Texas, March 17, 2018Lost Pines Trail, Bastrop County, Texas, 78602, United States
Orange berry rust fungus Gymnoconia nitens on young leaves of blackberry in Lick Creek Park. College Station, Texas, March 14, 2022Deer Run Trail, College Station, Brazos County, Texas, United States
Aeciospores of blackberry rust fungus Gymnoconia nitens at low magnification from Lick Creek Park. College Station, Texas, March 14, 2022
Texture of echinulate spores of blackberry rust fungus Gymnoconia nitens from Lick Creek Park. College Station, Texas, March 14, 2022
Orange aeciospores of blackberry rust fungus Gymnoconia nitens from Lick Creek Park. College Station, Texas, March 14, 2022
Orange berry rust fungus Gymnoconia nitens on young leaves of blackberry on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 2, 2024Burleson County, Texas, United States
Orange berry rust fungus Gymnoconia nitens on shoots of blackberry on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 2, 2024Burleson County, Texas, United States
Aeciospores of blackberry rust fungus Gymnoconia nitens at low magnification, collected on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 2, 2024
Texture of aeciospores of blackberry rust fungus Gymnoconia nitens (stacked image), collected on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 2, 2024
Aeciospores of blackberry rust fungus Gymnoconia nitens (stacked image), collected on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 2, 2024
Aeciospores of blackberry rust fungus Gymnoconia nitens, collected on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 2, 2024Observations in East and Central Texas revealed the presence of Orange Berry Rust fungus Gymnoconia nitens on blackberry plants. The fungus was found on various parts of the plant, including shoots, leaves, and young leaves, in several locations: Falls on the Brazos Park, Bastrop State Park, Lick Creek Park, and near Birch Creek Unit of Somerville Lake State Park. The fungus caused orange-colored spots or lesions on the plants, often accompanied by purple spots caused by Helicobasidium purpureum. Aeciospores of the fungus were also observed under low magnification, exhibiting an echinulate texture. The observations were made over several years, from 2018 to 2024, indicating a persistent presence of the fungus in the region. The affected blackberry plants were often blooming, suggesting that the fungus can infect plants at various stages of growth.
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