Likewise, 18 OnM2-specific CSEPs (Additional file 3: Table S28) which are up-regulated in haustoria may play crucial roles in OnM2’s pathogenicity and could be prioritized for future functional studies through host-induced gene silencing [72, 73] and ectopic expression in host plants to see if they can support infection of an otherwise nonhost PM fungus such as GcM1. The gene discussed is GCM1; the disease is infection.