Journal
JOURNAL OF THERMAL BIOLOGY
Volume 71, Issue -, Pages 24-31Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jtherbio.2017.10.007
Keywords
Cooling rates; Energy contents; Relative humidity; Starvation; The Khapra beetle
Funding
- Vali-e-Asr University of Rafsanjan
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Trogoderma granarium Everts (Coleoptera: Dermestidae) is an important insect pest of stored products. In this study, the survival strategies of T. granarium fourth instar larvae were investigated at different sub-zero temperatures following different cooling rates, acclimation to different relative humidity (RH) and different starvation times. Our results show that larvae of T. granarium are freeze-intolerant. There was a strong link between cooling rates and supercooling point, which means the slower the decrease in temperature, the lower the supercooling point. Trehalose content was greater in insects cooled at a rate of 0.5 degrees C/min. According to results, the RH did not affect supercooling point. However, acclimation to an RH of 25% increased mortality following exposure to - 10 degrees C/24 h. The time necessary to reach 95% mortality was 1737 h and 428 h at - 5 degrees C and - 10 degrees C. The lowest lipid and trehalose content was detected in insects acclimated to 25% RH, although, the different RH treatments did not significantly affect glycogen content of T. granarium larvae. The supercooling point of larvae was gradually increased following starvation. By contrast, fed larvae had the greatest lipid, glycogen, and trehalose content, and insects starved for eight days had the lowest energy contents. There was a sharp decline in the survival of larvae between 11 and - 18 degrees C after 1 h exposure. Our results indicate the effects of cooling rate and starvation on energy reserves and survival of T. granarium. We conclude that T. granarium may not survive under similar stress conditions of the stored products.
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