Rhizococcus cactearum (Leonardi, 1918)

Recorded by Borg (1932) as frequently found on various species of Mammillaria, Cereus, Echinocactus, Peleciphora and other non-specified plants. Hoy (1963) and Kozár et al. (2013) included Malta in the distribution range of this species. No Maltese specimens have been seen during the present work.