Length of discoloration (cm)
| Species | Control | LacBalsam | Polyurethene | Wood dowel |
|---|---|---|---|---|
| Large-leaved lime | 11/21/35* | 11/25/58 | 13/20/26 | 42/58/69 |
| Small-leaved lime | 9/16/21 | 8/10/13 | 10/14/16 | 6/13/18 |
| Horsechestnut | 25/39/63 | 17/40/80 | 36/57/68 | 43/64/86 |
| Silver birch | 100/155/200 | 95/133/185 | 30/85/180 | — |
↵* Minimum/Average/Maximum.
Metric equivalents: 1 in. = 2.5 cm.