Table 3.
Classification of girdling roots
Root Type (%)
Norway maple
Sugar maple
Red maple
Green ash
Honey-locust
First order (1 °)
28
8
6
25
17
Second order (2°)
50
48
56
30
72
Third order (3°)
20
36
32
45
11
Fourth order (4°)
2
8
6
0
0