Herbicides and physical damages in teak stumps to control of sprouts after thinning

The stumps of thinning trees of Tectona grandis L.f. present intense sprouts that compete with the remaining trees. The efficacy of the control of sprouts with the herbicides picloram and triclopyr, associated or no it applications of physical damages, were evaluated. Immediately after thinning, in plantation with four years old, the stumps were treated, and in other plantation, with age of six, the sprouts of stumps thinned in the previous year, were treated. The percentage of died stumps, the number of sprouts by stump and the respective heights were registered. In the first trial, the combined application of picloram at 0.48% with triclopyr at 0.96%, associated a 20 cracks with axe killed all stumps. In the second trial, the best efficacy, 21.7%, was obtained with the previous mowing of sprouts and application of picloram at 0.96%. After thinning, the isolated application of picloram or combined with triclopyr, associates or not a physical damage is efficient to control sprouts of teak. The application in the sprouts of stumps thinned in the last year present any efficiency, with least percentage of dead stumps in relation to application after thinning.

Tectona grandis; elimination of sprouts; picloram; triclopyr

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