This study was conducted to determine the effect of 2 insecticides/miticides, spinosad and abamectin, and 2 fungicides, thiophanate-methyl and fenhexamid, when applied alone or mixed in all combinations, on the survival of Neoseiulus cucumeris (Oudemans). Neoseiulus cucumeris is a predatory mite utilized in greenhouses for managing western flower thrips, Frankliniella occidentalis Pergande. The deutonymph and adult stages of N. cucumeris were directly exposed to the pesticide treatments or a water control. Overall, the deutonymphs were more susceptible to the pesticide treatments, based on percent survival 24 h after treatment, than the adults. Five of the 7 pesticide mixtures containing spinosad and 4 of the 7 mixtures containing abamectin resulted in deutonymph mortality values between 50 and 69%. Thiophanate-methyl alone and in combination with either spinosad or abamectin resulted in >35% mortality of the deutonymphs. Based on the results of this study, spinosad and abamectin, when used alone or in mixture with thiophanate-methyl will reduce N. cucumeris populations by killing the deutonymphs. This information is important to greenhouse managers who want to use pesticide mixtures to manage arthropod pests and fungal pathogens without disrupting biological control programs for western flower thrips.