Percentage change in size of pruning wounds of eight tree species treated and untreated with 9.6 g (0.34 oz) PBZ by soil drench.
| Species | Treatment | % change in 1 year | % change in 2 years | % change in 3 years |
|---|---|---|---|---|
| White oak | Treated | 8.4 b* | 7.1 b | 12.0 b |
| (Quercus alba) | Control | 23.7 a | 45.0 a | 58.3 a |
| Red oak | Treated | 4.9 b | 9.8 b | 16.5 b |
| (Q. rubra) | Control | 13.0 a | 34.4 a | 64.9 a |
| Sweetgum | Treated | 19.5 b | 19.0 b | 18.2 b |
| (Liquidambar styraciflua) | Control | 31.4 a | 68.3 a | 95.5 a |
| Black walnut | Treated | 4.9 a | 3.0 a | 7.6 b |
| (Juglans nigra) | Control | 5.0 a | 5.3 a | 24.6 a |
| European black alder | Treated | 8.6 a | 20.3 b | 52.7 b |
| (Alnus glutinosa) | Control | 10.5 a | 44.3 a | 99.7 a |
| Yellow poplar | Treated | 21.1 a | 50.2 a | 80.3 a |
| (Liriodendron tulipifera) | Control | 22.2 a | 55.3 a | 87.0 a |
| White ash | Treated | 14.3 a | 35.8 a | 55.2 a |
| (Fraxinus americana) | Control | 17.3 a | 41.7 a | 60.2 a |
| White pine | Treated | 36.2 a | 61.3 a | 89.9 a |
| (Pinus strobus) | Control | 24.6 a | 53.6 a | 80.0 a |
↵* Pair values followed by the same lower case letter are not significantly different at the P ≤ 0.05 level (Tukey’s Studentized Range Test).