Abstract

CARO-CORRALES, Lorena et al. Prediction of surviving larvae of mexican fruit fly after heating in a block system. Agrociencia [online]. 2014, vol.48, n.2, pp.211-233. ISSN 2521-9766.

Modeling thermal death kinetics and heat transfer can allow the prediction of temperature-time combinations for a thermal process, which will facilitate successful development of thermal treatments for pest control. The objectives of this study were: 1) to predict the number of surviving third-instar Anastrepha ludens after heating in a block system using a thermal death kinetic model, 2) to validate predictions of surviving larvae, determining survival of malformed puparia and, 3) to assess heat resistance by gender of eclosed adults. Exposure times for 44, 46, and 48 °C were calculated for 30, 50, 70, 90, and 99 % mortality. Predictions of surviving larvae were successfully validated; for all temperature-time combinations the difference was lower than one larva. Larvae that survived heat treatment and pupariated were scored as surviving larvae. Nevertheless, not all puparia eclosed to adults; some developed as malformed puparia. Adults from treated puparia that did not show malformations emerged at least 24 h later than adults from control puparia. Heat treatment also induced larviform, bottlenose and incompletely-eclosed puparia, but none of them eclosed as adult flies. From treated normal puparia, male larvae were more tolerant to heat in two of the eight temperature-time combinations where there was fly production. The thermal death kinetic model satisfactorily predicted the number of surviving third-instar A. ludens after heating in a block system at the studied sublethal temperature-time combinations.

Keywords : Anastrepha ludens; puparia; heating block system.

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