Indigo ProForce Cortex Duo Herbicide 10LCortex Duo Herbicide is a unique, non selective, non glyphosate, Dual Control Herbicide. Cortex Duo is a non selective knockdown and residual herbicide featuring Dual Control Herbicide Technology to provide control of seedling and young broadleaf and grass weeds and suppression of established weeds and perennial species. Cortex Duo is registered for use in and around paths, driveways, roadsides, sheds, gardens, amenity horticulture areas, protected