| Quercus suber showed a clear loss in vitality. |
| The white oaks Q. robur, Q. petraea, Q. suber and Q. ilex are very important forest and plantation trees in the EPPO region. |
| The cambium may be affected, but in spring the outside of the bark appears normal, remaining green if the suber layer is sufficiently thin. |
| The cork oak, Quercus suber, grows either singly among other trees or in groups, principally in the southern parts of the island. |
| Also in terms of discolouration, most damaged trees were found among Quercus suber. |
| That the suber of the Romans was our cork-tree, is generally and with justice admitted. |
