Best Quality Eraser 41% Systemic Weed Cntrl / Size Gallon By Control Solutions Inc Size: Gallon /Color Eraser 41% is great for non-selective broad-spectrum control of annual and perennial weeds, woody brush and trees. This post-emergent systemic herbicide has no residual soil activity, and is relatively non-toxic to dogs and other domestic. Use 1 1/3 oz per gallon of water to control most annual weeds; use 2 2/3 oz to control most perennial weeds. This listing is for a quantity (1) one gallon container.