Glyphosate at 0.5 kg ha"+surfactant (0.1 %) and glyphosate at 1.0 kg ha" provided most effective control of Erigeron canadensis but was toxic to the grasses in natural grasslands. Significantly higher herbage yield was recorded by 2, 4-D Na at 0.75 kg ha"+surfactant (0.1%) and 2, 4-D (EE) 1.25 kg ha· '.