Bornman, SimonéThomas, ChanelNtladi, SolomonWilken, Pieter Markus2024-08-122024-08-122024-03Bornman, S., Thomas, C., Ntladi, S. et al. Sclerotinia sclerotiorum is the causal agent of Sclerotinia stem rot on peanut (groundnut) in South Africa. Australasian Plant Disease Notes 19, 13 (2024). https://doi.org/10.1007/s13314-024-00537-21833-928X (online)10.1007/s13314-024-00537-2http://hdl.handle.net/2263/97564Sclerotinia stem rot on South African groundnut was previously attributed to Sclerotinia minor, but recent infections prompted a re-evaluation. Isolates underwent a species-specific PCR and phylogenetic analysis, confirming them as S. sclerotiorum. Koch’s postulates were fulfilled, demonstrating pathogenicity. Inoculation caused disease symptoms, with subsequent re-isolation matching the original strains. This study identifies S. sclerotiorum as the causative agent of Sclerotinia stem rot on groundnut in South Africa.en© The Author(s) 2024.Sclerotinia sclerotiorumSclerotinia minorGroundnutPeanut blightSouth AfricaSDG-02: Zero hungerSouth Africa (SA)Article