The mixed release of predators and parasitoids to control a target pest can produce different results. In some cases, this mixed introduction can induce an increase in the predation rates of the pest and even, of the parasitoid. To explain this phenomenon, it has been hypothesized that the presence of parasitoids (revealed by their mobility or related products) and interspecific competition (parasitoid vs predator) could influence such rates of predation. Therefore, in the present study we tested the effect of parasitoid mobility, host hemolymph (produced by parasitoid host-feeding) and parasitoid species (competing vs. non-competing species of the predator) on the number of prey consumed by the predator. Additionally, to add weight to the results of the bioassays, we determined whether the gender of the predators and parasitoids induced an effect on prey consumption by the predator by performing three bioassays under randomized block designs. Our results showed that neither parasitoid mobility nor host hemolymph presence modified the number of whitefly nymphs preyed upon by the predator. However, the number of whitefly nymphs consumed was significantly higher when the predator was introduced together with the competing parasitoid species relative to treatments with the non-competing parasitoid. In addition, we found that the predator preyed upon more mobile than immobile parasitoids and more competing than non-competing parasitoids. As for predator gender, we found that female predators consumed more whitefly nymphs relative to male predators and wasp gender did not affect predation. Overall, our results suggest that interspecific competition may be a more important factor regulating predator consumption than parasitoid mobility or the presence of the host hemolymph.