A standardized technique for establishing the susceptibility levels of adult stages of stored product pests to residual contact insecticides has been designed using disposable containers, standard kits and standard procedures. Filter papers are impregnated with a series of concentrations of the material being tested. Acetone is the preferred solvent for impregnation. Sufficiently non-volatile materials are supplied on the papers. Volatile materials are applied by the testers using standard solutions and papers, a ‘bed-of-nails’ and a hypodermic syringe. Paper cups with perforated lids serve as both exposure and holding cages and are then destroyed. Fittcd glass rings keep exposure areas constant and prevent insect escape. When an anaesthetic is required carbon dioxide is employed. Pre-exposure holding (i.e. starvation or other procedures), lengths of exposure periods, duration of holding or recovery period and other pertinent points are established for all common pests. Data forms are supplied to cooperators. Calculated probit-log-dosage regression lines and LD50's obtained therefrom indicate susceptibility levels and allow for comparisons between populations separated both in time and space.