Abstract
AbstractThis chapter discusses the introductions of two biotypes of the parasitic wasp Microctonus aethiopoides (Hymenoptera: Braconidae) to control two weevils, the lucerne weevil Sitona discoideus (Coleoptera: Curculionidae) and the clover root weevil S. lepidus (Coleoptera: Curculionidae) in New Zealand. This is presented as a case study with which to explore the potential of biological control agents against root herbivores. While it is the root-feeding life stages (the larvae) that actually cause the damage to plants, in this case the biological control agent is targeted at the aboveground life stages (the adults), illustrating the need to consider aboveground aspects of the life cycle when controlling the root feeder.
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