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Thermal death kinetic parameters of fifth-instar codling moths (Cydia pomonella (L.)) and the effect of three heating rates (11C min À1 , 101C min À1 , and 181C min À1 ) on larval mortality were determined by a heating block system. The insects were heated to four temperatures (461C, 481C, 501C, and 521C) held for predetermined periods followed by 24 h storage at 41C before mortality evaluation. Thermal death kinetics for fifth-instar codling moths followed a 0.5th order of kinetic reaction. Minimum time required to achieve 100% mortality of a given population decreased with temperature in a semi-logarithmic manner. No larval survival was observed in samples of 600 insects after exposure to 461C, 481C, 501C, and 521C for 50, 15, 5, and 2 min, respectively. Activation energy for thermal kill of fifth-instar codling moths at the heating rate of 181C min À1 was estimated to be about 472 kJ mol À1 . The lethal time accumulated during the ramp period was about 1.8, 0.2, and 0.1 min for the heating rates of 11C min À1 , 101C min À1 , and 181C min À1 , respectively. r

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