Several members of Alternaria section Alternaria are economically important plant-pathogenic fungi that cause disease on a wide range of host types and plant tissues. The production of Alternaria-derived mycotoxins can lead to significant post-harvest losses due to contamination of agricultural products. Multiple Alternaria species are listed as regulated organisms, which are monitored by international plant protection programmes. These taxa often share high levels of both morphological and phylogenetic similarity, and the establishment of molecular markers...