Abstract
Functional and numerical responses of the predators:Phytoseiulus persimilisAthias-Henriot,Metaseiulus occidentalis (Nesbitt), andAmblyseius chilenensis (Dosse) [Acarina, Phytoseiidae] were observed at prey (Tetranychus urticaeKoch [Acarina, Tetranychidae]) densities up to 300 prey/6.45 cm2. Neither functional nor numerical response curves revealed any prey-predator interference effects, i.e.: the dome-shaped response curves (Holling, 1961), did not occur.
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