Mortality and history of a Zelkova planting (102 trees) in southern Michigan, 1955-1976.
| Year | No. of trees dying | Cause of death | Comments |
|---|---|---|---|
| 1955-65 | 23 | Unknown | |
| 1966 | 3 | Probably canker | Mower injury abundant, cankers common |
| 1967 | 4 | Canker | ” |
| 1968 | 4 | Canker | Mower injury rare |
| 1969 | 16 | Mouse injury canker | Many trees severely injured by mice during winter |
| 1970 | 1 | Canker | Mower injury rare Few active cankers |
| 1971 | 1 | Canker | |
| 1972 | 5 | Ice damage, Canker | Severe ice storm March caused extensive injury |
| 1973 | 2 | Canker, decay following mouse injury | |
| 1974 | 1 | Canker | |
| 1975 | 1 | Canker |