The Swingle rootstock is a citrus variety used for grafting various citrus species. It is particularly resistant to diseases such as citrus tristeza virus and citrus dwarfing disease, which affect other citrus varieties.
The Swingle originated in the 1900s from a hybrid citrus variety developed by the University of Florida (Duncan × Poncirus trifoliata). Although it is a relatively new variety, it has become one of the most popular in the citrus industry due to its high resistance and ability to adapt to different soil and climate conditions.
