How to enhance pest control by generalist predatory mites in greenhouse crops.

Abstract

Generalist predatory mites are increasingly used in greenhouse crops to control small insects and mites. The success of these predators is strongly affected by crop characteristics. Crops that provide non-prey food facilitate predator establishment. Here we review three methods for improving establishment of generalist predatory mites in greenhouse crops based on (1) crop diversity, (2) pest diversity and (3) alternative food. The underlying theory about food web interactions is discussed in order to predict the effect of these methods on biological control. Furthermore, we show preliminary results of experiments in which alternative food was added to enhance predator establishment.