Mark VanGessel, Extension Weed Specialist; mjv@udel.edu
Italian ryegrass and annual ryegrass are the same species. They are difficult to kill early in the spring when burning down no-till fields. Every year there are fields that are treated but the ryegrass does not die. Most of the time these fields were treated with a quart rate of glyphosate plus a residual herbicide or glyphosate was applied with fertilizer as part or all of the spray volume. In my trials, the best option has been to use glyphosate at 48 to 64 fl oz (based on a 4.5 lb acid formulation), do not tankmix other herbicides, and apply with only water as the carrier.