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Simple models were developed to explore the interaction between the lucerne (Medicago sativa L.) pest Sitona discoideus Gyllenhal and its introduced braconid parasite Microctonus aethiopoides Loan in New Zealand. A model for the population dynamics of S. discoideus demonstrated that observed levels of parasitism account for a decline in pest abundance, in spite of strong density-dependent mortality in the host. An empirical model for changes in parasitism from year to year, spanning five to six parasitoid generations each year, suggested that control is likely to be maintained in the long term and that the interaction is stable
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Barlow et al. (1993) studied this question.
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