This review of biological and cultural control of Phthorimaea operculella (Zell.) on potatoes in South Africa includes reports of some work presented by other workers for theses at the University of Pretoria. S.W. Broodryk found four indigenous parasites [cf. RAE/A 62, 998, 4719; 63, 2002, etc.], of which Diadegma mollipla (Hlmgr.) often achieved over 70% parasitism of P. operculella. Since the introduction of Copidosoma koehleri (Blanch.) and Apanteles subandinus Blanch., the indigenous parasites have played a minor role and seldom achieve more than 10% parasitism of P. operculella. The role of predators is described from field and laboratory investigations, the two most common predacious coccinellids in Highveld potato lands being Lioadalia flavomaculata (Deg.) and Adonia variegata (Goeze). It is reported that larvae of Chrysops were not common in potato fields, and when found were heavily parasitised, especially by Tetrastichus sp. and Isodromus timberlakei Annecke. H.G. Zimmerman found that 4.9% of tubers suffered damage by P. operculella when ridging was completed, as compared with 15.5% when the third (final) ridging was omitted. The use of insecticides against P. operculella is advised only when ridging is undesirable due to adverse conditions such as drought. none