Transcription factor that regulates asexual reproduction. Binds the StuA-response elements (StRE) with the consensus sequence 5'-(A/T)CGCG(T/A)N(A/C)-3' at the promoters of target genes. Required for the formation of aerial hyphae, efficient conidiation, and the formation of perithecia. Essential for the generation of normal turgor pressure within the appressorium. Required for infection of intact apple fruit and penetration of onion epidermal cells