Abstract
Many methods have been developed to estimate population size by capture-recapture (Lincoln 1930; Fisher & Ford 1947; Parr 1965; Jolly 1965; Manly & Parr 1968; Seber 1973). Associated with these methods are estimates of field longevity. The biology of the large narcissus bulb fly, Merodon equestris Fab. in the U.K. has been documented by Hodson (1932) and in the U.S.A. by Doucette et al. (1942). The field biology of the adult is not fully understood, however, and no previous estimates of population size or field longevity have been made, only estimates of adult longevity in cages and insectaries (Weigel 1926; Broadbent 1927; Hodson 1932; Doucette et al. 1942). Estimates of field longevity of M. equestris may be useful when planning control measures against the adult especially if short-lived insecticides are used.
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