The effects of fenproximate (Fujimite), quininoline (Kanemite), etoxazole (Zeal), spriomesefen (Oberon) and bifenezate (Acramite) on Galendromus occidentalis (Nesbitt) fertility and fecundity were assessed under laboratory conditions in residual and contact bioassays. Placing adult females on a substrate treated with either Acramite or Kanemite did not affect fecundity nor fertility while Oberon decreased fecundity, Zeal also reduced fertility and Fujimite killed all of the exposed females. Treating the adult females directly with Acramite, Kanemite and Oberon reduced fecundity but not fertility, while Zeal reduced fertility and Fujimite killed all of the treated females. Intensity of effects varied among chemicals, and results could lead to their integration into spider mite management programs.