Phoma nigrificans (P. Karst.) Boerema et al., a New Species for Poland

Phoma nigrificans was isolated from leaves of Thiaspi arvense. The cultural characteristics are described, and results of comparative pathogenicity tests including Phoma iingam isolates on B. napus var. oieifera and T. arvense are given. This is the first report of P. nigrificans from Poland.