Monterey Once A Year Insect Control IIMonterey Once A Year Insect Control II, This insecticide is used as a soil drench on ornamental trees, shrubs and certain fruit and nut trees. It controls adelgids, leaf beetles, leafhoppers, mealy bugs, scale, whiteflies, borers (including the Emerald Ash borer) and many others. Gives a full year of control. No spraying, just use around the roots as a soil drench for full season insect control.