A brown-sugar flotation technique, recovery trays, and fruit dissection, three methods for determining numbers of larvae of Rhagoletis mendax Curran (Diptera: Tephritidae) from lowbush blueberry fruit, were tested at Kentville, Nova Scotia, in 1990. Similar numbers of larvae were detected by each method, with an average of 3.3, 5.2, and 17.3 larvae recovered at low, medium, and high levels of infestation, respectively. Recovery trays require a minimum of labour but results are available only after 2 weeks, and thus they are of no use for rapid determination. For quality or quarantine inspections, brown-sugar flotation should be used.