Genus Gymnosporangium is a type of fungus that typically infects certain species of trees and shrubs. This genus is widely known for causing cedar apple rust, a fungal disease that affects apple trees and other members of the rose family. Some synonyms for this genus include Gymnosporangium oxycedri, Gymnosporangium sabinae, and Gymnosporangium yamadae. While each of these different species of Gymnosporangium may have slightly different characteristics and preferences, they all share a common ability to infect and damage their host plants. To prevent the spread of Gymnosporangium and other plant diseases, it's important to practice good hygiene in the garden, including removing infected plant debris and using clean gardening tools.