This study was conducted under laboratory conditions to determine the suitability of Brevipalpus obovatus Donnadieu as a prey to Neoseiulus idaeus Denmark & Muma. N. idaeus took longer to develop to adulthood and practically did not oviposit when fed exclusively a combination of all stages of B. obovatus. The duration of the combined immature stages of N. idaeus on a combination of B. obovatus and M. tanajoa was about the same when the predator was fed only M. tanajoa. Oviposition rate was however lower on that diet, resulting in a slightly lower value of r_m. The results indicated that B. obovatus by itself is favorable for the survivorship but unfavorable for the reproduction of N. idaeus, despite their common occurrence on cassava plants.