Low Volume Invert Emulsions for Purple Nutsedge (Cyperus rotundus) Control

Abstract

Greenhouse experiments were conducted in 1989 at Stoneville, MS to evaluate the efficacy of fluridone and MSMA applied at 0.3 and 1.0 kg ai ha-1, respectively, either alone or in combination and with or without 0.1 M ammonium sulfate on purple nutsedge. The herbicides were applied at 19 L ha-1in an oil-water, invert emulsion (low-volume) and at 187 L ha-1in water with a nonionic surfactant (0.25% v/v) (high-volume). Purple nutsedge control with both herbicides alone or in combination was greater with the low-volume than with the high-volume application. Addition of MSMA to fluridone, or of ammonium sulfate to fluridone plus MSMA did not enhance purple nutsedge control over fluridone alone applied in low volume. The addition of ammonium sulfate to fluridone alone applied in low volume reduced purple nutsedge control.