TY - JOUR T1 - Isolation, incidence and management of Phytophthora in forest tree nurseries in the Pacific Northwest [USA] JF - Plant Disease Reporter Y1 - 1979 A1 - Hansen, E.M. A1 - P.B. Hamm A1 - Julis, AJ A1 - L.F. Roth VL - 63 ER -