Interacting elevated CO2 and tropospheric O3 predisposes aspen (Populus tremuloides Michx.) to infection by rust (Melampsora medusae f. sp tremuloidae). - Karnosky,D..F..; Percy,K..E..; Xiang,B..X..; Callan,B..; Noormets,A..; Mankovska,B..; Hopkin,A..; Sober,J..; Jones,W..; Dickson,R..E..; Isebrands,J..G.. (Global Change Biology, 2002)