Table 1.

Diameter of pruning cuts, length of barrier zone, and decay column length in longitudinal section behind heading cuts made through 2- to 3-year-old and 4- to 5-year-old wood 4 years after original heading cut. (Means are based on three stems on three trees in each treatment.)

Pruning treatmentMean diameter of original heading cut (mm)Mean length of barrier zone (mm)Mean decay/discoloration column length (mm)
Headed 2- to 3-year-old wood (pollard)18 (0.7 in.) by18 (0.7 in.) b8 (0.3 in.) b
Headed 4- to 5-year-old wood (topped)27 (1.1 in.) c736 (29.0 in.) c58 (2.3 in.) c
Not pruned0 a0 a0 a
  • z Distance in longitudinal section from heading cut to end of decay or discoloration, whichever is longer.

  • y Means in a column are statistically different at P < 0.01.