To test whether biological control of spider mites is promoted by the use of multiple instead of a single predator species, experiments have been published that employed either an additive design (initial density of each predator is kept constant) or a replacement design (initial density of all pred
Predatory mites (Acari: Phytoseiidae, but now also Laelapidae) have gained momentum as agents for successful biocontrol of plant pests. The time has gone where they were mainly considered for the control of spider mites. Various new predatory mite species have been identified for the control of othe
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