Transcriptional regulator; part of the gene cluster that mediates the biosynthesis of phomenoic acid, a long chain aliphatic carboxylic acid that does not appear to be essential for pathogenicity but may play a role in allowing to outcompete other fungi in the environmental niche via its antifungal properties (PubMed:23396262). Positively regulates the expression of the cluster and subsequent production of phomenoic acid (PubMed:23396262). Leads to reduced expression of genes for the polyketide synthase PKS2, the cytochrome P450 monooxygenase P450, the alcohol dehydrogenase/quinone reductase YogA, the lipid transport exporter superfamily member RTA1 and the a major facilitator superfamily transporter MFS, as well as a marked reduction in phomenoic acid production.