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The objective of this work was to evaluate the effect of different treatments with pre-emergent herbicides on the emergence, survival and initial growth of seedlings of tree species from riparian forests. The experiment was conducted in a greenhouse in a randomized blocks design with four replicates and five treatments. The herbicides used were imazapyr, atrazine, acetochlor and oxyfluorfen at the rates of 3,0L p.c./ha, 5,0L p.c./ha, 3,0L p.c./ha e 4,5L p.c./ha, respectively, plus a control treatment (no herbicide). Acetochlor showed satisfactory results in the emergence and seedlings surviving of Senna multijuga, Senna macranthera, Solanum granuloso-leprosum and Trema micrantha. Imazapyr affected all other species but not T. micrantha in the seedlings surviving. Atrazine and oxyfluorfen can be used in some cases but it is necessary a close evaluation of each species. Herbicides did not show better results on the emergence or seedlings survival when compared to the control (no herbicide). Observed phytotoxic effects were 2 similar to those described in the literature. The tested herbicides were efficient to control all weeds found in the control treatment.

Efeito de herbicidas de pré-emergência sobre o desenvolvimento inicial de espécies arbóreas