As regulations on use of insecticides continue to become more stringent, there is a need to look for lower risk alternatives, including insect growth regulators. The insect growth regulator, methoprene, has been shown to decrease populations of Indianmeal moth (Plodia interpunctella Hübner) by preventing development into adults. The target life stage for this study is the wandering phase or fifth instar due to its tolerance to conventional insecticides. Methoprene can be used to control Indianmeal moth in food processing and distribution facilities as an aerosol, as a surface treatment or by direct application to packaging materials. The objective of this study was to determine which method is most effective in controlling fifth instars of the Indianmeal moth. Larvae were exposed for 2 or 4 hours on a paper packaging material treated at the label rate for surface application (1 ml/3784 ml/94m2). Survival of larvae to the adult stage at these exposure times was 67.5 % + 4.9 and 31.1% + 3.7, respectively. Larvae were also exposed for two hours to methoprene aerosol at the rate of 1 ml/10ft3, in accordance with label directions. Survival to the adult stage was 11. 34% + 1.4 and was much lower than any exposure interval on the treated packaging material. These studies indicate that both treatment options are viable, however aerosol treatments result in higher adult inhibition than surface treatments at shorter exposure intervals.