Category Soilborne Diseases History, Distribution and Uses Subject Avocado Root Rot (Phytophthora cinnamomi) People Title Phytophthora cinnamomi (avocado root rot) replant trial Description Avocado replant trial with potential resistant rootstock material. Peter Oudemans standing near ‘Hass’ tree on Duke 9 rootstock. This trial was a landmark demonstration of the potential for resistant rootstocks to control avocado root rot. Embacadero Ranch, Goleta, CA. Location Goleta, CA Date July, 1985 Source George E. Goodall Larger Picture 1000 x 673 (86 kb)