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23 April 2019 Recognition of Five Larval Instars in Conotrachelus perseae (Coleoptera: Curculionidae)
Á. Castañeda-Vildózola, C.P. Illescas-Riquelme, J. Valdez-Carrasco, L.E. Cazado, J.R. Sánchez-Pale, V. López-Martínez
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Abstract

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%.

Á. Castañeda-Vildózola, C.P. Illescas-Riquelme, J. Valdez-Carrasco, L.E. Cazado, J.R. Sánchez-Pale, and V. López-Martínez "Recognition of Five Larval Instars in Conotrachelus perseae (Coleoptera: Curculionidae)," Journal of Entomological Science 54(2), 113-120, (23 April 2019). https://doi.org/10.18474/JES18-139
Received: 6 November 2018; Accepted: 8 November 2018; Published: 23 April 2019
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KEYWORDS
avocado weevil
Dyar's rule
instar determination
larval growth
quarantine Pest
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