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Thermal death kinetics of red flour beetle (Coleoptera: Tenebrionidae)

Permanent URL:
http://handle.nal.usda.gov/10113/8682
File:
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Abstract:
While developing radio frequency heat treatments for dried fruits and nuts, we used a heating block system developed by Washington State University to identify the most heat-tolerant life stage of red flour beetle, Tribolium castaneum (Herbst), and to determine its thermal death kinetics. Using a heating rate of 15 degrees C/min to approximate the rapid heating of radio frequency treatments, the relative heat tolerance of red flour beetle stages was found to be older larvae > pupae and adults > eggs and younger larvae. Lethal exposure times for temperatures of 48, 50, and 52 degrees C for the most heat-tolerant larval stage were estimated using a 0.5th order kinetic model. Exposures needed for 95% mortality at 48 degrees C were too long to be practical (67 min), but increasing treatment temperatures to 50 and 52 degrees C resulted in more useful exposure times of 8 and 1.3 min, respectively. Red flour beetle was more sensitive to changes in treatment temperature than previously studied moth species, resulting in red flour beetle being the most heat-tolerant species at 48 degrees C, but navel orangeworm, Amyelois transitella (Walker), being most heat tolerant at 50 and 52 degrees C. Consequently, efficacious treatments for navel orangeworm at 50-52 degrees C also would control red flour beetle.
Author(s):
Johnson, J.A. , Valero, K.A. , Wang, S. , Tang, J.
Subject(s):
Tribolium castaneum , insect control , heat treatment , heat tolerance , developmental stages , mortality , kinetics , temperature , duration , dynamic models
Format:
p. 1868-1873.
Note:
Includes references
Source:
Journal of economic entomology 2004 Dec., v. 97, no. 6
Language:
English
Year:
2004
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.