Trumpet flower (Tecoma stans) is na exotic woody shrub observed as an invader of degraded pastures in the State of Parana - Brazil. The canopy of trumpetflower is so dense that no forage plants growunderneath. The chemical control of this weed was tested in two experiments, using the commercial formulation of 2,4-D + picloram and tebuthiuron. The former was prepared as a solution into water or lubricative used oil, at the concentrations of 4 and 10%. The solutions at 4% were used for painting the stumps immediatly after trunks had being cut off, close to the ground level. The solutions at 10% were used for painting the basal portion of the trunks, immediatly after damaging it with a machete close to the ground level. Tebuthiuron was used granulated at doses of 2, 4, 6, 8, 10 e 20 g/plant. The doses were dressed on the soil near the base of the trunk. The formulation 2,4-D + picloram did not kill the plants, which produced new shoots 0,74 to 1,21 m high five month after the treatment. Tebuthiuron was effective even at the lowest dose of 2g/plant. After the treatment, plant died in nine months.
Stenolobium stans; 2,4-D; picloram; tebuthiuron; pasture