The aim of this work was to evaluate the efficacy of post-emergence herbicides on soybean plants in order to control Commelina erecta L. This experiment was carried out under greenhouse conditions. the herbicides were applied on plants at six leaves stage. Following treatments with six replications (doses in i.a./ha) were tested: 1) Glyphosate (1494 g), 2) Tifensulfuron methyl (6 g), 3) Chlorimuron ethyl (10 g), 4) Benazolin (300 g), 5) Flumiclorac pentil (30 g), 6) Bentazon (480 g), 7) Lactofen (156 g), 8) Fomesafen (200 g), 9) Oxifluorfen (480 g) , 10) Imazethapyr (80 g), 11) Fluoroglicofen (48 g) and an untreated control. Visual evaluations and plants height measurements were made after 7 and 14 days. Dry matter 28 days after applications was determined. With the obtained data an ANOVA test was conducted. All treatments showed significant differences from the untreated control at 5% level (LSD Test). Best performance treatments were: Glyphosate (100% plant mortality) and Imazethapyr (67% plant mortality), differing significatively with the rest of treatments. Chlorimuron ethyl, Bentazon and Lactofen also showed high efficacy, reducing weed dry matter more than 80%. Benazolin and Flumiclorac pentil were less effective, even so they respectively reduced dry matter to 50 and 65%.
Weed control; crop; postemergency