Fecundity and development of the predatory mitesGalendromus longipilis(Nesbitt),Neoseiulus fallacis(Garman),Phytoseiulus macropilis(Banks),Proprioseiopsis temperellus(Muma and Denmark) (Acarina: Phytoseiidae) and the prey,Tetranychus urticaeKoch (Tetranychidae) was studied at 13.3° and 26.4°C. All predators developed faster thenT. urticae.N. fallacishad the shortest development time and one of the highest oviposition rates of the predators at both temperatures, followed byG. longipilis.P. temperellusrequired the most prey, consuming 48.2T. urticaeeggs/day at 26.4°C.On restricted universes,G. longipilisandN. fallaciscontrolled highT. urticaepopulations within 11 days after introduction.T. urticaewas not controlled byP. temperelluson the universe and appeared to be unsuitable as prey for this species.