| Category | Soilborne Diseases History, Distribution and Uses |
| Subject | Avocado Root Rot (Phytophthora cinnamomi) People |
| Title | Evaluating avocado rootstock trial |
| Description | Don Petty, Jr. (left) and Howard Ohr (right) rating Petty rootstock trial, Carpinteria, CA. |
| Location | Carpinteria, CA |
| Date | October, 1979 |
| Source | George E. Goodall |
| Larger Picture | 1000 x 674 (91 kb) |
