Thermal thresholds of the predatory mite .

The lower and upper thermal activity thresholds of adult and larval von Heyden (Acari: Erythraeidae) are compared with those of its prey Koch (Acari: Tetranychidae). Adult female retain ambulatory function (CT) and movement of appendages (chill coma) at significantly lower temperatures (5.9 and -2.

Comparison of thermal activity thresholds of the spider mite predators Phytoseiulus macropilis and Phytoseiulus persimilis (Acari: Phytoseiidae).

The lower and upper thermal activity thresholds of the predatory mite Phytoseiulus macropilis Banks (Acari: Phytoseiidae) were compared with those of its prey Tetranychus urticae Koch (Acari: Tetranychidae) and one of the alternative commercially available control agents for T. urticae, Phytoseiulus persimilis Athias-Henriot. Adult female P.