Thermal-death kinetics of fifth-instar Amyelois transitella (Walker) (Lepidoptera: Pyralidae)

Abstract

Information on kinetics for thermal mortality of navel orangeworm, Amyelois transitella (Walker) (Lepidoptera: Pyralidae), is needed for developing post-harvest phytosanitation thermal treatments of walnuts. Thermal-death kinetics for fifth-instar navel orangeworms were determined at temperatures between 461C and 541C at a heating rate of 181C min À1 using a heating block system. Thermal-death curves for fifth-instar navel orangeworms followed a 0.5th-order of kinetic reaction. The time required to achieve 100% mortality (N 0 ¼ 600) decreased with increasing temperature in a logarithmic manner. Complete kill of 600 insects required a minimum exposure time of 140, 50, 15, 6, and 1 min at 461C, 481C, 501C, 521C, and 541C, respectively. The reaction rate (k) was affected by treatment temperatures following an Arrhenius relationship. The activation energy for thermal kill of fifth-instar navel orangeworms was estimated to be between 510 and 520 kJ mol À1 . r

Thermal death kinetics and heating rate effects for fifth-instar Cydia pomonella (L.) (Lepidoptera: Tortricidae)

“…Details of this heating system have been described in Ikediala et al (2000) and the improved version in Wang et al (2002). The death rate kinetics and the effect of heating rates on thermal mortality of insects were investigated using this heating system.…”

Reaction Orders for Thermal Mortality of Third Instars of Mexican Fruit Fly (Diptera: Tephritidae)

“…The E a values for C. cephalonica were similar to those for S. oryzae (Yan et al 2014), fifth-instar Cy. pomonella (Wang et al 2002a), fifth-instar P. interpunctella (Johnson et al 2003), fifth-instar A. transitella (Wang et al 2002b), third-instar Ce. capitata (Gazit et al 2004), and Queensland fruit fly, Bactrocera tryoni eggs (Waddell et al 2000), larger than those Caribbean fruit fly, Anastrepha suspensa eggs (Moss and Chan 1993), but smaller than those for T. castaneum ) and Ce.…”

“…1). An HBS consisting of two aluminum blocks (254 by 254 by 18 mm 3 ) built by Washington State University was rented from Northwest A&F University and used to heat the fifth-instar C. cephalonica , Wang et al 2002b). …”

“…Heating rate, set-point temperature, and exposure time were controlled by a customized Visual Basic program and PID controllers (I32, Omega Engineering Inc., Stanford, CT) via a solid state relay. The high thermal capacitance of the blocks provided smooth temperature profiles over the heating and holding periods with temperature deviations from the set point ( 60 C) of <0.3 C (Wang et al 2002b). A detailed description of the HBS could be found in Ikediala et al (2000) and Wang et al (2002b).…”

“…Although only 0th order kinetic model is reported for adult rice weevil, Sitophilus oryzae (Yan et al 2014), the 0.5th order kinetic model has been mostly applied to thermal response of many insects, such as Cy. pomonella (Wang et al 2002a), Indianmeal moth, Plodia interpunctella (Johnson et al 2003), A. transitella (Wang et al 2002b), Mediterranean fruit fly, Ceratitis capitata (Gazit et al 2004, Armstrong et al 2009), red flour beetle, Tribolium castaneum , and Mexican fruit fly, Anastrepha ludens (Hallman et al 2005). To develop effective heat treatments on disinfesting walnuts, it is essential to determine the thermal death kinetic models for the C. cephalonica based on the HBS data.…”