A trapping study was conducted to determine the probability of detecting moderate to low populations of Anastrepha suspense (Loew) in citrus groves in central Florida in June and July 1982. Flies were released at rates of 9, 90, and 900 per 0.4 ha and were re trapped in a grid work of 168 McPhail traps (18.2 traps per 0.4 hal. The percent recovery of flies released in the two tests was 14.4 and 12.9%, respectively. The sex ratio of flies recovered averaged 0.35 males per female from a release ratio of 1:1. From the percentage of traps that contained flies of each population, we determined the probability of detecting different population levels of a uniform distribution and age class with various numbers of traps per unit area.
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Calkins et al. (1984) studied this question.