Adjuvants affect the efficacy of glyphosate on selected perennial weeds

The efficacy of glyphosate in controlling bermudagrass (BG) (Cynodon dactylon L.), guineagrass (GG) (Panicium maximum Jacq.), and purple nutsedge (PN) (Cyperus rotundus L.) was determined when the herbicide was used alone or in combination with adjuvants: Frigate, LI-700, or VPG in a volume of 378 liters of water/ha. No loss of BG control was noted as the glyphosate level was lowered from 4.5 to 2.25 kg.ha -1 with Frigate added, but control decreased with VPG or no adjuvant addition (LI-700 not used). (...)