A 30 cm long log was removed 1.3 m above the ground level, from each of the 7 years old trees from the species Corymbia citriodora, Eucalyptus paniculata, Eucalyptus urophylla, Eucalyptus urophylla x Eucalyptus camaldulensis, Eucalyptus torelliana x Corymbia citriodora and from 11 years old Pinus oocarpa trees.