In September 2012, during a survey for tomato (Solanum lycopersicum) viruses in the Campania region (southern Italy), two plants of perennial wallrocket (Diplotaxis tenuifolia) showing moderate leaf yellowing symptoms were noticed in the vicinity of a tomato crop. The plants were collected for further analysis. Nearby tomato crops displayed necrotic streaks on the stems, basal leaf necrosis, and necrotic rings on the fruits in ∼0.5% of the plants. Based on the results of serological assays, pathogenicity test, PCR and analysis, the causal agent was identified as Parietaria mottle virus (PMoV). While PMoV is not novel in tomato, this is thought to be the first report of the virus in wallrocket in Italy.