2015IntroducedFirst commercial availability of UFR-4 is listed as 2015 in the UF/IFAS fifth-edition Florida Citrus Rootstock Selection Guide.Sources: [2]
March 7th2017PatentedU.S. plant patent USPP27745P3 for citrus rootstock UFR-4 was granted and published.Sources: [3]
World of CitrusWorld of Citrus