Percent of failures occurring in each region for control branches and watersprouts in silver maple trees converted from round-over to V-trim during electrical line clearance operations.
Treatment | No failure (%) | Beyond POAz (%) | At POAy (%) | Near POAx (%) | Leader (%) |
---|---|---|---|---|---|
Control | 7 | 7 | 33 | 53 | 0 |
Watersprout | 8 | 8 | 33 | 31 | 21 |
↵z Beyond POA = failure occurred along the branch/watersprout and further than two diameter lengths from the point of attachment (POA).
↵y At POA = failure occurred at the point of attachment of branch/watersprout to parent stem (leader).
↵x Near POA = failure occurred along the branch/watersprout but within two diameter lengths from the point of attachment.
Leader = main leader broke before watersprout.
The table is adapted from a previous publication by the author (Dahle et al. 2006).