In this picture, the fungus Gymnosporangium juniperi-virginianae produces bright orange telial horns in a gall on a cedar tree. The basidiospores produced by germinating teliospores will be carried by the wind to infect the alternate host of this rust fungus, an apple, crabapple, or related host.
Rachel LeissoWisconsin Department of Agriculture, Trade, and Consumer Protection, Plant Industry Bureau Laboratory
Host: Juniperus virginiana; Eastern red cedar (Juniper) Disease name: Cedar-apple rust Pathogen name: Gymnosporangium juniperi-virginianae
APS publication number: IW000112
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