CsVosA was functionally characterized for the first time in this fungus by gene knockout and complementation.

CsVosA negatively regulates spore production under both constant dark and constant light conditions.

CsVosA affects conidiogenesis pattern by regulating the genes involved in this process.

CsVosA affects virulence and its deletion leads to reduced expression of two genes for non-ribosomal peptide synthetases.

The mutant phenotypes were fully restored by the wild type CsVosA gene.