U.S. Department of Agriculture: Agricultural Research Service, Lincoln, Nebraska


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Published in Journal of Stored Products Research 38 (2002) 441–453.


Thermal death kinetic parameters of fifth-instar codlingmoths (Cydia pomonella (L.)) and the effect of three heating rates (1°Cmin-1, 10°Cmin-1, and 18°Cmin-1) on larval mortality were determined by a heatingblock system. The insects were heated to four temperatures (46°C, 48°C, 50°C, and 52°C) held for predetermined periods followed by 24 h storage at 4°C before mortality evaluation. Thermal death kinetics for fifth-instar codlingmoths 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 46°C, 48°C, 50°C, and 52°C for 50, 15, 5, and 2 min, respectively. Activation energy for thermal kill of fifth-instar codling moths at the heating rate of 18°Cmin-1 was estimated to be about 472 kJ mol-1. The lethal time accumulated duringthe ramp period was about 1.8, 0.2, and 0.1 min for the heatingrates of 1°Cmin-1, 10°Cmin-1, and 18°Cmin-1, respectively.