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Abstract

Herbicides were applied foliarly twice a year for broad leaf weed control in tropical pastures and compared with traditional method (cutting with machete). The herbicides and doses were: picloram + 2,4-D amina (1-2%), 2,4,5-T (1-2%), dicamba (1-2%) and 2,4-D + 2,4,5-T (1-2%). Weed control effectiveness of all herbicides and doses were significant superior (p<.01) to the machete cutting. Significant differences (p<.05) were found between the groups of herbicides formed by picloram + 2,4-D amina (1,2%), 2,4,5-T (1,2%), 2,4-D + 2,4,5-T (2%), compared to dicamba (1-2%) and 2,4-D + 2,4,5-T (1%). No significant differences were found (p>.05) within the first group of herbicides and doses. However, better control effects were shown by picloram + 2,4-D amina (95.5%), 2,4,5-T 1% (92.3%) and 2,4-D + 2,4,5-T 2% (90.5%). The less expensive treatments were as follow: 2,4,5-T 1% (B/ .35.20/ha), picloram + 2,4-D amina 1% (B/ .44.64/ha) and cutting with machete (B/ .50.00/ha).