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1 October 2015 Thermal Death Kinetics of Conogethes punctiferalis (Lepidoptera: Pyralidae) as Influenced by Heating Rate and Life Stage
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Thermal death kinetics of Conogethes punctiferalis (Guenée) (Lepidoptera: Pyralidae) at different life stages, heating rate, and temperature is essential for developing postharvest treatments to control pests in chestnuts. Using a heating block system (HBS), the most heat-tolerant life stage of C. punctiferalis and the effects of heating rate (0.1, 0.5, 1, 5, and 10°C/min) on insect mortality were determined. The thermal death kinetic data of fifth-instar C. punctiferalis were obtained at temperatures between 44 and 50°C at a heating rate of 5°C/min. The results showed that the relative heat tolerance of C. punctiferalis was found to be fifth instars > pupae > third instars > eggs. To avoid the enhanced thermal tolerance of C. punctiferalis at low heating rates (0.1 or 0.5°C/min), a high heating rate of 5°C/min was selected to simulate the fast radio frequency heating in chestnuts and further determine the thermal death kinetic data. Thermal death curves of C. punctiferalis followed a 0th-order kinetic reaction model. The minimum exposure time to achieve 100% mortality was 55, 12, 6, and 3 min at 44, 46, 48, and 50°C, respectively. The activation energy for controlling C. punctiferalis was 482.15 kJ/mol with the z value of 4.09°C obtained from the thermal death—time curve. The information provided by thermal death kinetics for C. punctiferalis is useful in developing effective postharvest thermal treatment protocols for disinfesting chestnuts.

© The Authors 2015. Published by Oxford University Press on behalf of Entomological Society of America.
Lixia Hou, Yanli Du, Judy A. Johnson, and Shaojin Wang "Thermal Death Kinetics of Conogethes punctiferalis (Lepidoptera: Pyralidae) as Influenced by Heating Rate and Life Stage," Journal of Economic Entomology 108(5), 2192-2199, (1 October 2015).
Received: 27 February 2015; Accepted: 19 June 2015; Published: 1 October 2015

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