Calorimetric evaluation of responses of Sitophilus oryzae and Tribolium confusum to elevated temperatures and controlled atmospheres

Publication Type:Journal Article
:2008
Authors:C. J. Downes, van Epenhuijsen, C. W., Lill, R. E., Downes, J. E., Carpenter, A., Brash, D.
Journal:Journal of Stored Products Research
Volume:44
Pagination:295-303
Date Published:2008
Type of Article:Article
:0022-474X
:Sitophilus oryzae
:

Metabolic heat rates, determined by microcalorimetry, were used to measure the effect of controlled atmospheres (CAs) and elevated temperatures on the stored-product insects Sitophilus oryzae (rice weevil) and Tribolium confusum (confused flour beetle). Results for larval and adult stages in air, and in a range of low O2 and/or high CO2 CAs, at temperatures from 15 to 45 [degree]C, showed the general effectiveness of such atmospheres in lowering the lethal temperatures relative to those in air. Effects on adult S. oryzae at 25 [degree]C were explored in more detail in experiments using the following conditions: exposure to anoxic CAs for extended times; exposure to hypoxic CAs; and simulated hermetic storage. A simple scanning calorimetric method was developed for determining lethal temperatures and a combined thermo-gravimetric and differential thermal-analysis method Was used to interpret the thermal events, due to loss of water, occurring at and above these temperatures. (C) 2008 Elsevier Ltd. All rights reserved.

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