Mix up only what you will need , the chemicals lose potency after mixing. Definitions Foliar Spray - This is spraying the leaves top and bottom and getting only a minimum onto the roots and in the pot. I use a hose end sprayer to do this function. If you have only a few plants, a pump up sprayer will do. Never spray with the same insecticide twice in a row, alternate two or more to prevent the critters from developing a resistance to one.
Mealybugs are some of the toughest insects to control.
Drench at 7-10 day intervals with alternating insecticides 3 three times. Enstar, Precor - these are growth regulators that prevent insects from reaching maturity, breaking the life cycle. May be used with other insecticides, improving the chances of control. Diazinon - available in many concentrations, use at the rate recommended for roses, a contact spray, no systemic action. Liquid Sevin - same as Diazinon, keep off of exposed roots.