Head capsule widths of Conotrachelus perseae Barber (Coleoptera: Curculionidae) larvae extracted from avocado, Persea americana Mill. cv. Fuerte, were measured by computerized imagery. Head capsule widths ranged from 212 to 1,562 µm and, according to an analysis of frequency distribution using the HCAP program and Dyar's rule, formed five well-defined modal groups which suggests five larval instars. The mean head capsule widths were 264, 428, 642, 1,009, and 1,493 µm for the first through the fifth instars, respectively, with a probability of misclassification of instar below 3%.
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Vol. 54 • No. 2