 SpV1-R8A2 B infects "Spiroplasma citri".Its host itself is a prokaryotic pathogen for citrus plants, causing Citrus stubborn disease.The phage is a spiroplasmal virus of morphologic group 1 (SpV1), isolated from" Spiroplasma citri" strain R8A2 (SpV1-R8A2) subclone B (SpV1-R8A2 B).