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Plant-inhabiting predatory mites in the family Phytoseiidae are known to disperse passively on air currents. In this article ww analyse observations on the behaviour that initiates aerial dispersal, the so-called take-off behaviour. When starved for 24 hours at 25°C and 35% RH, about 80% of the females of Phytoseiulus persimilis Athias-Henriot became(More)
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