Synonyms: Caeoma pyratum, Gymnosporangium macropus, Gymnosporangium virginianum, Podisoma juniperi, Roestelia pyrata.
Common name: juniper-apple rust.
Extract from Wikipedia article: Gymnosporangium juniperi-virginianae is a plant pathogen that causes cedar-apple rust. In virtually any location where apples or crabapples (Malus) and Eastern red-cedar (Juniperus virginiana) coexist, cedar apple rust can be a destructive or disfiguring disease on both the apples and cedars. Quince and hawthorn are the most common host and many species of juniper can substitute for the Eastern red cedars.
Gymnosporangium juniperi-virginianae is a rust fungus that infects Eastern red cedar (Juniperus virginiana) and apple or pear trees (Malus or Pyrus spp.). In East and Central Texas, it is commonly found on Eastern red cedar, where it produces orange to yellow gelatinous horns or galls on the branches. The fungus then releases spores that can infect nearby apple or pear trees, causing damage to leaves and fruit. The fungus is widespread in the region, with many reports from counties including Brazos, Grimes, and Robertson, and is often associated with orchards and urban landscapes where Eastern red cedar and apple or pear trees coexist.
Cedar apple rust fungus Gymnosporangium juniperi-virginianae on a twig of red cedar near a road along north shore of Lake Somerville near Birch Creek Unit Somerville Lake State Park. Texas, March 14, 2018
Cedar-apple gall (fungus Gymnosporangium juniperi-virginianae) on a twig of red cedar at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Cedar-apple gall (fungus Gymnosporangium juniperi-virginianae) with gelatinous protrusions on Eastern red cedar (Juniperus virginiana) in Wolf Pen Creek Park. College Station, Texas, March 13, 2019
Cedar-apple gall (fungus Gymnosporangium juniperi-virginianae) with gelatinous protrusions from Eastern red cedar (Juniperus virginiana) in Wolf Pen Creek Park. College Station, Texas, March 13, 2019
Fungus Gymnosporangium juniperi-virginianae on Eastern red cedar (Juniperus virginiana) in Wolf Pen Creek Park. College Station, Texas, March 13, 2019
Cedar-apple gall (fungus Gymnosporangium juniperi-virginianae) with gelatinous protrusions on a twig of red cedar (Juniperus virginiana) in Wolf Pen Creek Park. College Station, Texas, March 13, 2019
Close up of gelatinous protrusions of cedar-apple gall (fungus Gymnosporangium juniperi-virginianae) on Eastern red cedar (Juniperus virginiana) in Wolf Pen Creek Park. College Station, Texas, March 13, 2019
Gelatinous protrusions of cedar-apple gall (fungus Gymnosporangium juniperi-virginianae) on a twig of Eastern red cedar (Juniperus virginiana) in Wolf Pen Creek Park. College Station, Texas, March 13, 2019
Cedar-apple gall (fungus Gymnosporangium juniperi-virginianae) on a twig of Eastern red cedar (Juniperus virginiana) in Wolf Pen Creek Park. College Station, Texas, March 13, 2019The fungus Gymnosporangium juniperi-virginianae was observed on Eastern red cedar (Juniperus virginiana) in East and Central Texas. In Somerville Lake State Park, the fungus formed galls on twigs of red cedar near Lake Somerville, with observations recorded in March 2018 and January 2019. Similar observations were made in Wolf Pen Creek Park in College Station, where the fungus produced gelatinous protrusions on infected twigs, as seen in multiple photographs taken on March 13, 2019. The fungus was consistently found on Eastern red cedar, with no other host species observed. The galls and gelatinous protrusions were prominent features of the infection, indicating active growth of the fungus. These observations suggest that Gymnosporangium juniperi-virginianae is a common pathogen of Eastern red cedar in East and Central Texas.
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