Percentage closure 4,12, and 16 months after treatment July 1,1991 of holes oriented at the four cardinal directions in Liriodendron tulipiferatrunks and injected with Clipper and Cutless at both 45° and 90° angles.
| Injection hole orientatior | Months after treatment | ||
|---|---|---|---|
| 14 | 12 | 16 | |
| % closure | |||
| North | 53 a#1 | 73 a#+ | 96 a+ |
| East | 46 a# | 73 a+ | 92 a+ |
| South | 52 a# | 50 a# | 85 a# |
| West | 65 a# | 68 a# | 100 a+ |
↵1 alues in columns with the same letter and values in rows followed by the same symbols are not statistically different at 1% using Students-Newman-Keuls’.