The objective ofthis work was to evaluate five control systems of native vegetation and thedamages caused by cattle and sheep to trees of three eucalyptus populations.A split-plot experimental design in two randomized complete blocks was used.Treatments were a) three populations of Eucalyptus saligna Smith. (204,400 and 816 plants/ha) as the main plots; b) five control systems of the nativevegetation (without control, pre-emergent herbicide, pre and post-emergent herbicides,cattle grazing or sheep grazing) as subplots. The cattle and sheep grazing werethe most efficient than any other treatments. The cattle caused more damageto the trees than sheep did. There is a close relation between tree height anddamages caused by cattle and sheep at the moment of the introduction of theseanimals in the underneath forest.
