Europe Eastern Europe Baltic States Belarus Central European Russia East European Russia Northwest European Russia Ukraine Middle Europe Austria Belgium Czechoslovakia Germany Hungary Netherlands Poland Switzerland Northern Europe Denmark Finland Great Britain Ireland Norway Sweden Southeastern Europe Albania Bulgaria Greece Italy Romania Sicilia Yugoslavia Southwestern Europe France Portugal Spain Introduced into Northern America Eastern Canada New Brunswick Ontario Québec North-Central U.S.A. Wisconsin Northeastern U.S.A. Connecticut Maine Masachusettes Michigan New Hampshire New York Pennsylvania Vermont Northwestern U.S.A. Oregon Washington Southeastern U.S.A. Delaware Maryland Virginia Western Canada Manitoba

Europe Eastern Europe Baltic States Belarus Central European Russia East European Russia Northwest European Russia Ukraine Middle Europe Austria Belgium Czechoslovakia Germany Hungary Netherlands Poland Switzerland Northern Europe Denmark Finland Great Britain Ireland Norway Sweden Southeastern Europe Albania Bulgaria Greece Italy Romania Sicilia Yugoslavia Southwestern Europe France Portugal Spain Introduced into Northern America Eastern Canada New Brunswick Ontario Québec North-Central U.S.A. Wisconsin Northeastern U.S.A. Connecticut Maine Masachusettes Michigan New Hampshire New York Pennsylvania Vermont Northwestern U.S.A. Oregon Washington Southeastern U.S.A. Delaware Maryland Virginia Western Canada Manitoba