BHorticultural Oil Insect Spray ReviewbP PP Horticultural Oil Insect Spray PConcentrated oil is mixed with water then sprayed on your tree to control a variety of insects.PControls mites, scale insects, galls, mealy bugs, aphids and other insects.PHorticultural Oil Insect Spray kills insects by blocking their pores and smothering them.P1 Pint (473.16mL) concentrate makes about 6-13 gallons of spray, enough to treat 2-3 large trees.