Transcription factor that plays a central role in appressorium formation and pathogenicity (PubMed:17378924, PubMed:9487695). Required for the expression of a large set of genes including factors that might play a role in membrane metabolism and ergosterol biosynthesis, the chitin-binding protein CBP1,as well as CHS7 that is essential for normal pathogenic development (PubMed:17378924). Impairs appressorium formation and growth in plant hosts.