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SUMMARY (4) A population model based on that of May (1978), but with k from the negative binomial now a function of host density as observed for Cyzenis, is analysed and the stability properties displayed. (5) This general model for parasitism is included in a more detailed model for the winter moth and Cyzenis at Wytham Wood. It shows Cyzenis to play a minor part in the winter moth population dynamics, which is largely governed by the destabilizing effects of the key-factor and the stabilizing effects of the density dependent soil mortality. (6) A model for the winter moth and CyzeMis in Nova Scotia is developed. Cyzenis is assumed to search in the manner found for Wytham Wood, but the other components are derived from the studies of Embree (1965, 1966). The model predicts the successful biological control of the winter moth that has been observed in Nova Scotia following the introduction of Cyzenis. The reasons for the very different performances of Cyzenis at Wytham Wood and Nova Scotia are discussed.
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M. P. Hassell (1980) studied this question.
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