Eraser is a weed and grass killer concentrate that is great for non-selective broad-spectrum control of annual and perennial weeds, woody brush and trees. This post-emergent systemic herbicide contains 41% glyphosate with a surfactant included to increase effectiveness. In addition, Eraser has no residual soil activity.  This is the same as Knockout Weed & Grass Killer, Super Concentrate Gallon.