Fig 3. Genetic clustering of the established/spreading populations sampled in: (1) Croatia (2009); (2) Hungary (2009); (3) Serbia (2009); three locations from Italy, (4) Friuli Venezia Giulia (2009), (5) Cordenons (Pordenone region) (2009), (6) Lazzago (2010); and the USA (Arizona, Iowa, Illinois, Nebraska).