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The effect of diapause and cold acclimation on the cold-hardiness of the warehouse beetle, Trogoderma variabile (Coleoptera: Dermestidae)

Published online by Cambridge University Press:  18 July 2014

Ahmed Y. Abdelghany
Affiliation:
Agriculture & Agri-Food Canada, Biosystems Engineering, Room E2-376, Engineering, Information and Technology Complex, 75A Chancellor’s Circle, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
Duangsamorn Suthisut
Affiliation:
Postharvest and product Processing Research and Development Office, Department of Agriculture Bangkok, 50 Phaholyothin Road 10900, Thailand
Paul G. Fields*
Affiliation:
Agriculture & Agri-Food Canada, Biosystems Engineering, Room E2-376, Engineering, Information and Technology Complex, 75A Chancellor’s Circle, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
*
1Corresponding author (e-mail: paul.fields@agr.gc.ca).

Abstract

The warehouse beetle, Trogoderma variabile Ballion (Coleoptera: Dermestidae), is a stored-product pest with scant information on its cold tolerance. Ninety-two per cent of larvae reared in isolation at 30 °C went into diapause in the seventh instar, the remaining 8% emerged as adults in 50 days. Diapausing larvae died after 142 days in the 10th instar. The cold tolerance at 0 °C from highest to lowest was; old larvae>pupae>adult=young larvae>eggs. The LT50 (lethal time for 50% of the population) for grouped (non-diapause) non-acclimated old larvae at 0 °C, −5 °C, −10 °C, −16 °C, and −19 °C were; 20, 11, 5, 1, and 1 day, the LT95 were; 38, 15, 10, 5, and 1 days, respectively. The LT50 for isolated (diapausing), cold-acclimated old larvae at the same temperatures were; 275, 125, 74, 26, and 18 days, and the LT95 were; 500, 160, 100, 45, 20 days, respectively. The supercooling point (SCP) of different stages of non-acclimated insects ranged from −25.3 °C (eggs) to −16.1 °C (young larvae). The most cold hardy stage, isolated and acclimated old larvae, had a SCP of −24.9 °C. The potential of using low temperatures to control T. variabile is discussed.

Type
Physiology, Biochemistry, Development and Genetics
Copyright
© Her Majesty the Queen of Canada 2014, as presented by the Minister of Agriculture and Agri-Food 

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Footnotes

Subject Editor: Brent Sinclair

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