Early blight (EB) is an important disease of solanaceous crops such as potatoes and tomatoes. During a two-year surveillance study, potato and tomato samples displaying symptoms of EB were collected from selected plantations in Mauritius. Microscopic examination of samples revealed typical beaked conidia characteristic of Alternaria spp. as well as atypical elliptical-septate spores. The latter were subsequently isolated on media and identified by PCR using ribosomal genes (ITS region), and protein encoding actin and calmodulin genes. The atypical isolates were identified to be Curvularia lunata. The original isolates were successfully recovered when performing pathogenicity testing, thus fulfilling Koch’s postulates. Optimum temperature and relative humidity of isolate growth, as determined by climate-controlled chambers, were 25–30ºC and 95% respectively. To our knowledge, this is the first detailed report of C. lunata causing Curvularia blight infections in potato and tomato crops of Mauritius, characterizing its growth temperature and humidity preferences.