title: Thermal Death Kinetics of Conogethes Punctiferalis (Lepidoptera: Pyralidae) as Influenced by Heating Rate and Life Stage.
abstract: 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.
authors.affiliation: College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China. shaojinwang@nwsuaf.edu.cn.
authors.forename: Lixia
authors.initials: L
authors.lastname: Hou
authors.affiliation: Plant Science and Technology College, Beijing University of Agriculture, Beijing 102206, China.
authors.forename: Yanli
authors.initials: Y
authors.lastname: Du
authors.affiliation: USDA, Agricultural Research Service, San Joaquin Valley Agricultural Sciences Center, 9611 S. Riverbend Ave., Parlier, CA 93648-9757.
authors.forename: Judy A
authors.initials: JA
authors.lastname: Johnson
authors.affiliation: College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China. Department of Biological Systems Engineering, Washington State University, 213 L.J. Smith Hall, Pullman, WA 99164-6120. shaojinwang@nwsuaf.edu.cn.
authors.forename: Shaojin
authors.initials: S
authors.lastname: Wang
mesh_terms: D000818:Animals; D006361:Heating; D006358:Hot Temperature / Q000009:adverse effects*; D007300:Insect Control; D007814:Larva / Q000254:growth & development / Q000502:physiology; D009036:Moths / Q000254:growth & development / Q000502:physiology*; D010063:Ovum / Q000254:growth & development / Q000502:physiology; D011679:Pupa / Q000254:growth & development / Q000502:physiology
keywords: Conogethes punctiferalis; heating rate; life stage; thermal death kinetics; thermal treatment