This study examined how adult whiteflies modulate their habitat choice patterns under trap cropping (i.e., bottom-up effect) and predation risk (i.e., top-down effect), and how this can influence pest management efficacy. First, eggplant was evaluated as a trap crop for two whitefly species, Bemisia argentifolii and Trialeurodes vaporariorum (Hemiptera: Aleyrodidae), on poinsettia. The results indicate that trap cropping has limited potential for either whitefly species for two different reasons. For B. argentifolii, the trap cropping was not effective as this species did not respond to the trap crop if the adults had first settled on the cash crop. For T. vaporariorum, high mortality of adult whiteflies on the cash crop significantly diluted the effectiveness of trap cropping even when a large number of adults were attracted to the trap crop. For this reason, there was only a marginal management benefit from the trap cropping for T. vaporariorum. Collectively, the trap cropping study demonstrates that the effectiveness of trap cropping is governed by the interplay between pest attraction to a trap crop and pest mortality on a cash crop. Experiments were conducted to determine whether adult B. argentifolii avoided predators of their offspring and how this behavior might influence trap cropping efficacy. The presence of predators, Delphastus catalinae (Coleoptera: Coccinellidae), on a poinsettia cash crop induced more adult whiteflies to leave the cash crop and move onto a cucumber trap crop, compared to whiteflies on the cash crop with no predators. This push effect increased the efficacy of the trap crop. Another set of experiments revealed that adult B. argentifolii modulated their avoidance behaviors to the predators across different spatial scales. The adult whiteflies delayed their settling on leaf-discs when they are confined with predators compared to when there were no predators. The adults showed a significant avoidance behavior at a within-plant scale by moving into the upper parts of the plants from the lower parts harboring predators. However, the presence of predators did not induce more whiteflies to disperse into adjacent plants at an amongplant scale. This study indicates that adult whiteflies can significantly change their habitat choice patterns under trap cropping and predation risk, and thus this behavioral change needs to be considered in the context of pest management.