Susceptibility of Pacific Northwest Conifers to Phytophthora Root Rot

1989

S. 15-18

3 Tab., 7 Lit. Ang.

Unselbständiges Werk

200023358

Seedlings of 11 conifer species were inoculated with 5 species of Phytophthora - P. cactorum (Lebert & Cohn) J. Schroet., P. cryptogea Pethybr. & Lafferty, P. drechsleri Tucker, P. megasperma Drechsler, and P. pseudotsugae Hamm & E.M. Hansen - to determine susceptibility to phytophthora root rot. Pine, cedar, larch, and spruce species showed tolerance to the disease whereas some true fir and hemlock species were quite susceptible. Other species showed intermediate susceptibility. Management of phytophthora root rot is discussed, utilizing this information on relative susceptibilty of various conifers grown in the Pacific Northwest.