The effect of percentage of crown removed on the occurrence of trunk canker In treated red and Norway maples. Average trunk canker rating based on ratings defined In Methods and Materials.
| Species | Percentage of crown removed during trimming | ||||
|---|---|---|---|---|---|
| 5 | 10 | 20 | 30 | ►30 | |
| Red maple | 1.5 | 1.36 | 1.77 | 2.83 | … |
| Norway maple | 0.36 | 0.32 | 0.6 | 1.13 | 1.29 |