If soil-applied herbicides are not adequately controlling grassy weeds or one is utilizing postemergence strategies for grass control, several herbicides are labeled for postemergence grass control in corn. Herbicides for grass control include Accent, Accent Gold, Basis Gold, Beacon, Celebrity Plus, Liberty, Lightning, Northstar, Poast Plus, Glyphosate products, and Steadfast. Accent can be applied as a broadcast spray on corn up to 20 inches tall or up to 6 exposed leaf collars, or as a directed spray on corn 20 - 36 inches tall or exhibits 9 or less exposed leaf collars.
Accent controls most annual grasses except crabgrass and also controls johnsongrass and shattercane.
The best results will be obtained when applied to foxtails, barnyardgrass, and fall panicum when they are 2 to 4 inches tall, shattercane and seedling johnsongrass when they are 4 to 12 inches tall, and rhizome johnsongrass 8 to 18 inches tall. Basis can be applied as a broadcast spray on corn in the spike through the 4-leaf or 2 exposed collar growth stage. Do not apply to corn with 3 fully exposed leaf collars or more than 6 inches tall. Apply to foxtails and fall panicum up to 2 inches tall. Accent Gold and Basis Gold can be applied as a broadcast spray on corn up to 12 inches tall or 5 or less exposed leaf collars.