The insecticides registered for control of bark beetles of southern pines are all formulated as emulsifiable concentrates and readily mix with water.
Labels always carry instructions for mixing certain volumes of finished spray.
However, it is convenient to know the formula for dilution of a concentrate so that any amount of finished spray may be prepared. Lindane is normally formulated at 20 percent active ingredient but the label should be checked before mixing. Suminithion 8E contains 8 pounds of fenitrothion per gallon. Dursban 4E contains 4 pounds of chlorpyrifos per gallon. The ratio of water to insecticide formulation must be calculated to achieve the proper dilution for a finished spray.