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Susceptibility of Plodia interpunctella (Lepidoptera: Pyralidae) developmental stages to high temperatures used during structural heat treatments

Published online by Cambridge University Press:  24 July 2007

R. Mahroof  and
B. Subramanyam
R. Mahroof
Affiliation:
Department of Grain Science and Industry, Kansas State University, Manhattan, KS 66506, USA
B. Subramanyam
Affiliation:
Department of Grain Science and Industry, Kansas State University, Manhattan, KS 66506, USA
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Abstract

Heating the ambient air of a whole, or a portion of a food-processing facility to 50 to 60°C and maintaining these elevated temperatures for 24 to 36 h, is an old technology, referred to as heat treatment. There is renewed interest in adopting heat treatments around the world as a viable insect control alternative to fumigation with methyl bromide. There is limited published information on responses of the Indian meal moth, Plodia interpunctella (Hübner), exposed to elevated temperatures typically used during heat treatments. Time-mortality relationships were determined for eggs, fifth-instars (wandering-phase larvae), pupae, and adults of P. interpunctella exposed to five constant temperatures between 44 and 52°C. Mortality of each stage increased with increasing temperature and exposure time. In general, fifth-instars were the most heat-tolerant stage at all temperatures tested. Exposure for a minimum of 34 min at 50°C was required to kill 99% of the fifth-instars. It is proposed that heat treatments aimed at controlling fifth-instars should be able to control all other stages of P. interpunctella.

Keywords

heat treatmentheat toleranceIndian meal mothPlodia interpunctellamethyl bromide alternative
Type
Research Article
Information
Bulletin of Entomological Research , Volume 96 , Issue 6 , December 2006 , pp. 539 - 545
Copyright
Copyright © Cambridge University Press 2006

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